Articles | Volume 15, issue 22
https://doi.org/10.5194/bg-15-7025-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-15-7025-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Nov 2018
Research article |
| 22 Nov 2018
Export flux of unprocessed atmospheric nitrate from temperate forested catchments: a possible new index for nitrogen saturation
Fumiko Nakagawa
Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Yusuke Obata
Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Kenta Ando
Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
Naoyuki Yamashita
Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata-shi, Niigata 950-2144, Japan
present address: Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan
Tatsuyoshi Saito
Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata-shi, Niigata 950-2144, Japan
present address: Niigata Prefectural Institute of Public Health and Environmental Sciences, 314-1 Sowa, Nishi-ku, Niigata-Shi, Niigata 950-2144,
Japan
Shigeki Uchiyama
Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata-shi, Niigata 950-2144, Japan
present address: Ministry of Agriculture, Forestry and Fisheries, 1-2-1, Kasumigaseki, Chiyoda-ku, Tokyo 100-8950, Japan
Masayuki Morohashi
Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata-shi, Niigata 950-2144, Japan
Hiroyuki Sase
Asia Center for Air Pollution Research, 1182 Sowa, Nishi-ku, Niigata-shi, Niigata 950-2144, Japan
Related authors
Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Masaaki Chiwa, Tamao Kasahara, and Ken'ichi Shinozuka
Biogeosciences, 20, 753–766, https://doi.org/10.5194/bg-20-753-2023, https://doi.org/10.5194/bg-20-753-2023, 2023
Short summary
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By monitoring the concentration and Δ17O of stream nitrate in three forested streams, the new nitrogen saturation index of forested catchments (Matm/Datm ratio) was estimated. We found that (1) the unprocessed atmospheric nitrate in our studied forested stream (FK1 catchment) was the highest ever reported in forested streams; (2) the Matm/Datm ratio can be used as a robust index for evaluating nitrogen saturation in forested catchments as the Matm/Datm ratio is independent of the precipitation.
Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Hiroyuki Sase, Masayuki Morohashi, and Hiroki Yotsuyanagi
Biogeosciences, 19, 3247–3261, https://doi.org/10.5194/bg-19-3247-2022, https://doi.org/10.5194/bg-19-3247-2022, 2022
Short summary
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Excessive leaching of nitrate from forested catchments during storm events degrades water quality and causes eutrophication in downstream areas. Thus, tracing the source of nitrate increase during storm events in forested streams is important for sustainable forest management. Based on the isotopic compositions of stream nitrate, including Δ17O, this study clarifies that the source of stream nitrate increase during storm events was soil nitrate in the riparian zone.
Hao Xu, Urumu Tsunogai, Fumiko Nakagawa, Keiichi Sato, and Hiroshi Tanimoto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1099, https://doi.org/10.5194/acp-2021-1099, 2022
Revised manuscript not accepted
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Using triple oxygen isotopic composition (Δ17O) of ozone as a new tracer, we estimated the absolute concentrations of stratospheric ozone supplied through stratosphere-troposphere transport in the troposphere. We observed the diurnal variations in the Δ17O of ozone, which could have affected studies (field measurements, atmospheric modeling) using Δ17O to constrain atmospheric chemical paths. Our study provides an important basis for a better understanding of ozone behavior in the troposphere.
David M. Nelson, Urumu Tsunogai, Dong Ding, Takuya Ohyama, Daisuke D. Komatsu, Fumiko Nakagawa, Izumi Noguchi, and Takashi Yamaguchi
Atmos. Chem. Phys., 18, 6381–6392, https://doi.org/10.5194/acp-18-6381-2018, https://doi.org/10.5194/acp-18-6381-2018, 2018
Short summary
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Atmospheric nitrate may be produced locally and/or come from upwind regions. To address this issue we measured oxygen and nitrogen isotopes of wet and dry nitrate deposition at nearby urban and rural sites. Our results suggest that, relative to nitrate in wet deposition in urban environments and wet and dry deposition in rural environments, nitrate in dry deposition in urban environments results from local NOx emissions more so than wet deposition, which is transported longer distances.
Urumu Tsunogai, Takanori Miyauchi, Takuya Ohyama, Daisuke D. Komatsu, Fumiko Nakagawa, Yusuke Obata, Keiichi Sato, and Tsuyoshi Ohizumi
Biogeosciences, 13, 3441–3459, https://doi.org/10.5194/bg-13-3441-2016, https://doi.org/10.5194/bg-13-3441-2016, 2016
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We quantified the influence of changes in land use and population density between each catchment area on the fate of atmospheric nitrate, by determining the areal distribution and seasonal variation in stable isotopic compositions of nitrate for more than 30 streams within a same watershed. We found that the absolute concentrations of atmospheric nitrate were almost the same between the streams irrespective to the changes in land use and population density.
Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Masaaki Chiwa, Tamao Kasahara, and Ken'ichi Shinozuka
Biogeosciences, 20, 753–766, https://doi.org/10.5194/bg-20-753-2023, https://doi.org/10.5194/bg-20-753-2023, 2023
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By monitoring the concentration and Δ17O of stream nitrate in three forested streams, the new nitrogen saturation index of forested catchments (Matm/Datm ratio) was estimated. We found that (1) the unprocessed atmospheric nitrate in our studied forested stream (FK1 catchment) was the highest ever reported in forested streams; (2) the Matm/Datm ratio can be used as a robust index for evaluating nitrogen saturation in forested catchments as the Matm/Datm ratio is independent of the precipitation.
Weitian Ding, Urumu Tsunogai, and Fumiko Nakagawa
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-236, https://doi.org/10.5194/bg-2022-236, 2023
Revised manuscript under review for BG
Short summary
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Past studies used the Δ17O of stream nitrate to estimate GNR in each forested catchment. However, the GNR estimated from the Δ17O of stream nitrate using the equations was more than six times the actual GNR in our simulated calculation for a forested catchment. As a result, it must be essential to clarify/verify the distribution of the Δ17O values of NO3− in forested soils before applying the Δ17O values of stream NO3− to estimate GNR.
Weitian Ding, Urumu Tsunogai, Fumiko Nakagawa, Takashi Sambuichi, Hiroyuki Sase, Masayuki Morohashi, and Hiroki Yotsuyanagi
Biogeosciences, 19, 3247–3261, https://doi.org/10.5194/bg-19-3247-2022, https://doi.org/10.5194/bg-19-3247-2022, 2022
Short summary
Short summary
Excessive leaching of nitrate from forested catchments during storm events degrades water quality and causes eutrophication in downstream areas. Thus, tracing the source of nitrate increase during storm events in forested streams is important for sustainable forest management. Based on the isotopic compositions of stream nitrate, including Δ17O, this study clarifies that the source of stream nitrate increase during storm events was soil nitrate in the riparian zone.
Hao Xu, Urumu Tsunogai, Fumiko Nakagawa, Keiichi Sato, and Hiroshi Tanimoto
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2021-1099, https://doi.org/10.5194/acp-2021-1099, 2022
Revised manuscript not accepted
Short summary
Short summary
Using triple oxygen isotopic composition (Δ17O) of ozone as a new tracer, we estimated the absolute concentrations of stratospheric ozone supplied through stratosphere-troposphere transport in the troposphere. We observed the diurnal variations in the Δ17O of ozone, which could have affected studies (field measurements, atmospheric modeling) using Δ17O to constrain atmospheric chemical paths. Our study provides an important basis for a better understanding of ozone behavior in the troposphere.
David M. Nelson, Urumu Tsunogai, Dong Ding, Takuya Ohyama, Daisuke D. Komatsu, Fumiko Nakagawa, Izumi Noguchi, and Takashi Yamaguchi
Atmos. Chem. Phys., 18, 6381–6392, https://doi.org/10.5194/acp-18-6381-2018, https://doi.org/10.5194/acp-18-6381-2018, 2018
Short summary
Short summary
Atmospheric nitrate may be produced locally and/or come from upwind regions. To address this issue we measured oxygen and nitrogen isotopes of wet and dry nitrate deposition at nearby urban and rural sites. Our results suggest that, relative to nitrate in wet deposition in urban environments and wet and dry deposition in rural environments, nitrate in dry deposition in urban environments results from local NOx emissions more so than wet deposition, which is transported longer distances.
Urumu Tsunogai, Takanori Miyauchi, Takuya Ohyama, Daisuke D. Komatsu, Fumiko Nakagawa, Yusuke Obata, Keiichi Sato, and Tsuyoshi Ohizumi
Biogeosciences, 13, 3441–3459, https://doi.org/10.5194/bg-13-3441-2016, https://doi.org/10.5194/bg-13-3441-2016, 2016
Short summary
Short summary
We quantified the influence of changes in land use and population density between each catchment area on the fate of atmospheric nitrate, by determining the areal distribution and seasonal variation in stable isotopic compositions of nitrate for more than 30 streams within a same watershed. We found that the absolute concentrations of atmospheric nitrate were almost the same between the streams irrespective to the changes in land use and population density.
U. Tsunogai, D. D. Komatsu, T. Ohyama, A. Suzuki, F. Nakagawa, I. Noguchi, K. Takagi, M. Nomura, K. Fukuzawa, and H. Shibata
Biogeosciences, 11, 5411–5424, https://doi.org/10.5194/bg-11-5411-2014, https://doi.org/10.5194/bg-11-5411-2014, 2014
F. Nakagawa, A. Suzuki, S. Daita, T. Ohyama, D. D. Komatsu, and U. Tsunogai
Biogeosciences, 10, 3547–3558, https://doi.org/10.5194/bg-10-3547-2013, https://doi.org/10.5194/bg-10-3547-2013, 2013
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Biogeosciences, 19, 3247–3261, https://doi.org/10.5194/bg-19-3247-2022, https://doi.org/10.5194/bg-19-3247-2022, 2022
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Excessive leaching of nitrate from forested catchments during storm events degrades water quality and causes eutrophication in downstream areas. Thus, tracing the source of nitrate increase during storm events in forested streams is important for sustainable forest management. Based on the isotopic compositions of stream nitrate, including Δ17O, this study clarifies that the source of stream nitrate increase during storm events was soil nitrate in the riparian zone.
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Biogeosciences, 19, 2671–2681, https://doi.org/10.5194/bg-19-2671-2022, https://doi.org/10.5194/bg-19-2671-2022, 2022
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We analysed the oxygen isotope composition of bones and teeth of four marine species possessing regional heterothermies. We observed a consistent link between oxygen isotope composition and temperature heterogeneities recorded by classical methods. This opens up new perspectives on the determination of the thermoregulatory strategies of extant marine vertebrates where conventional methods are difficult to apply, but also allows us to investigate thermophysiologies of extinct vertebrates.
Yuwei Liu, Guofeng Zhu, Zhuanxia Zhang, Zhigang Sun, Leilei Yong, Liyuan Sang, Lei Wang, and Kailiang Zhao
Biogeosciences, 19, 877–889, https://doi.org/10.5194/bg-19-877-2022, https://doi.org/10.5194/bg-19-877-2022, 2022
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We took the water cycle process of soil–plant–atmospheric precipitation as the research objective. In the water cycle of soil–plant–atmospheric precipitation, precipitation plays the main controlling role. The main source of replenishment for alpine meadow plants is precipitation and alpine meltwater; the main source of replenishment for forest plants is soil water; and the plants in the arid foothills mainly use groundwater.
Roberto Velázquez-Ochoa, María Julia Ochoa-Izaguirre, and Martín Federico Soto-Jiménez
Biogeosciences, 19, 1–27, https://doi.org/10.5194/bg-19-1-2022, https://doi.org/10.5194/bg-19-1-2022, 2022
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Our research is the first approximation to understand the δ13C macroalgal variability in one of the most diverse marine ecosystems in the world, the Gulf of California. The life-form is the principal cause of δ13C macroalgal variability, mainly taxonomy. However, changes in habitat characteristics and environmental conditions also influence the δ13C macroalgal variability. The δ13C macroalgae is indicative of carbon concentration mechanisms and isotope discrimination during carbon assimilation.
Raquel F. Flynn, Thomas G. Bornman, Jessica M. Burger, Shantelle Smith, Kurt A. M. Spence, and Sarah E. Fawcett
Biogeosciences, 18, 6031–6059, https://doi.org/10.5194/bg-18-6031-2021, https://doi.org/10.5194/bg-18-6031-2021, 2021
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Biological activity in the shallow Weddell Sea affects the biogeochemistry of recently formed deep waters. To investigate the drivers of carbon and nutrient export, we measured rates of primary production and nitrogen uptake, characterized the phytoplankton community, and estimated nutrient depletion ratios across the under-sampled western Weddell Sea in mid-summer. Carbon export was highest at the ice shelves and was determined by a combination of physical, chemical, and biological factors.
Stéphanie H. M. Jacquet, Christian Tamburini, Marc Garel, Aurélie Dufour, France Van Vambeke, Frédéric A. C. Le Moigne, Nagib Bhairy, and Sophie Guasco
Biogeosciences, 18, 5891–5902, https://doi.org/10.5194/bg-18-5891-2021, https://doi.org/10.5194/bg-18-5891-2021, 2021
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We compared carbon remineralization rates (MRs) in the western and central Mediterranean Sea in late spring during the PEACETIME cruise, as assessed using the barium tracer. We reported higher and deeper (up to 1000 m depth) MRs in the western basin, potentially sustained by an additional particle export event driven by deep convection. The central basin is the site of a mosaic of blooming and non-blooming water masses and showed lower MRs that were restricted to the upper mesopelagic layer.
Shinsuke Kawagucci, Yohei Matsui, Akiko Makabe, Tatsuhiro Fukuba, Yuji Onishi, Takuro Nunoura, and Taichi Yokokawa
Biogeosciences, 18, 5351–5362, https://doi.org/10.5194/bg-18-5351-2021, https://doi.org/10.5194/bg-18-5351-2021, 2021
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Hydrogen and carbon isotope ratios of methane as well as the relevant biogeochemical parameters and microbial community compositions in hydrothermal plumes in the Okinawa Trough were observed. We succeeded in simultaneously determining hydrogen and carbon isotope fractionation factors associated with aerobic oxidation of methane in seawater (εH = 49.4 ± 5.0 ‰, εC = 5.2 ± 0.4 ‰) – the former being the first of its kind ever reported.
Nicolai Schleinkofer, David Evans, Max Wisshak, Janina Vanessa Büscher, Jens Fiebig, André Freiwald, Sven Härter, Horst R. Marschall, Silke Voigt, and Jacek Raddatz
Biogeosciences, 18, 4733–4753, https://doi.org/10.5194/bg-18-4733-2021, https://doi.org/10.5194/bg-18-4733-2021, 2021
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We have measured the chemical composition of the carbonate shells of the parasitic foraminifera Hyrrokkin sarcophaga in order to test if it is influenced by the host organism (bivalve or coral). We find that both the chemical and isotopic composition is influenced by the host organism. For example strontium is enriched in foraminifera that grew on corals, whose skeleton is built from aragonite, which is naturally enriched in strontium compared to the bivalves' calcite shell.
Lena Rohe, Traute-Heidi Anderson, Heinz Flessa, Anette Goeske, Dominika Lewicka-Szczebak, Nicole Wrage-Mönnig, and Reinhard Well
Biogeosciences, 18, 4629–4650, https://doi.org/10.5194/bg-18-4629-2021, https://doi.org/10.5194/bg-18-4629-2021, 2021
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This is the first experimental setup combining a complex set of methods (microbial inhibitors and isotopic approaches) to differentiate between N2O produced by fungi or bacteria during denitrification in three soils. Quantifying the fungal fraction with inhibitors was not successful due to large amounts of uninhibited N2O production. All successful methods suggested a small or missing fungal contribution. Artefacts occurring with microbial inhibition to determine N2O fluxes are discussed.
Inga Köhler, Raul E. Martinez, David Piatka, Achim J. Herrmann, Arianna Gallo, Michelle M. Gehringer, and Johannes A. C. Barth
Biogeosciences, 18, 4535–4548, https://doi.org/10.5194/bg-18-4535-2021, https://doi.org/10.5194/bg-18-4535-2021, 2021
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We investigated how high Fe(II) levels influence the O2 budget of a circum-neutral Fe(II)-rich spring and if a combined study of dissolved O (DO) and its isotopic composition can help assess this effect. We showed that dissolved Fe(II) can exert strong effects on the δ18ODO even though a constant supply of atmospheric O2 occurs. In the presence of photosynthesis, direct effects of Fe oxidation become masked. Critical Fe(II) concentrations indirectly control the DO by enhancing photosynthesis.
Owen A. Sherwood, Samuel H. Davin, Nadine Lehmann, Carolyn Buchwald, Evan N. Edinger, Moritz F. Lehmann, and Markus Kienast
Biogeosciences, 18, 4491–4510, https://doi.org/10.5194/bg-18-4491-2021, https://doi.org/10.5194/bg-18-4491-2021, 2021
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Pacific water flowing eastward through the Canadian Arctic plays an important role in redistributing nutrients to the northwest Atlantic Ocean. Using samples collected from northern Baffin Bay to the southern Labrador Shelf, we show that stable isotopic ratios in seawater nitrate reflect the fraction of Pacific to Atlantic water. These results provide a new framework for interpreting patterns of nitrogen isotopic variability recorded in modern and archival organic materials in the region.
Franziska Slotta, Lukas Wacker, Frank Riedel, Karl-Uwe Heußner, Kai Hartmann, and Gerhard Helle
Biogeosciences, 18, 3539–3564, https://doi.org/10.5194/bg-18-3539-2021, https://doi.org/10.5194/bg-18-3539-2021, 2021
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The African baobab is a challenging climate and environmental archive for its semi-arid habitat due to dating uncertainties and parenchyma-rich wood anatomy. Annually resolved F14C data of tree-ring cellulose (1941–2005) from a tree in Oman show the annual character of the baobab’s growth rings but were up to 8.8 % lower than expected for 1964–1967. Subseasonal δ13C and δ18O patterns reveal years with low average monsoon rain as well as heavy rainfall events from pre-monsoonal cyclones.
Peter M. J. Douglas, Emerald Stratigopoulos, Sanga Park, and Dawson Phan
Biogeosciences, 18, 3505–3527, https://doi.org/10.5194/bg-18-3505-2021, https://doi.org/10.5194/bg-18-3505-2021, 2021
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Hydrogen isotopes could be a useful tool to help resolve the geographic distribution of methane emissions from freshwater environments. We analyzed an expanded global dataset of freshwater methane hydrogen isotope ratios and found significant geographic variation linked to water isotopic composition. This geographic variability could be used to resolve changing methane fluxes from freshwater environments and provide more accurate estimates of the relative balance of global methane sources.
Veronica R. Rollinson, Julie Granger, Sydney C. Clark, Mackenzie L. Blanusa, Claudia P. Koerting, Jamie M. P. Vaudrey, Lija A. Treibergs, Holly C. Westbrook, Catherine M. Matassa, Meredith G. Hastings, and Craig R. Tobias
Biogeosciences, 18, 3421–3444, https://doi.org/10.5194/bg-18-3421-2021, https://doi.org/10.5194/bg-18-3421-2021, 2021
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We measured nutrients and the naturally occurring nitrogen (N) and oxygen (O) stable isotope ratios of nitrate discharged from a New England river over an annual cycle, to monitor N loading and identify dominant sources from the watershed. We uncovered a seasonality to loading and sources of N from the watershed. Seasonality in the nitrate isotope ratios also informed on N cycling, conforming to theoretical expectations of riverine nutrient cycling.
Zixun Chen, Xuejun Liu, Xiaoqing Cui, Yaowen Han, Guoan Wang, and Jiazhu Li
Biogeosciences, 18, 2859–2870, https://doi.org/10.5194/bg-18-2859-2021, https://doi.org/10.5194/bg-18-2859-2021, 2021
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δ13C in plants is a sensitive long-term indicator of physiological acclimatization. The present study suggests that precipitation change and increasing atmospheric N deposition have little impact on δ13C of H. ammodendron, a dominant plant in central Asian deserts, but affect its gas exchange. In addition, this study shows that δ13C of H. ammodendron could not indicate its water use efficiency (WUE), suggesting that whether δ13C of C4 plants indicates WUE is species-specific.
Petra Zahajská, Carolina Olid, Johanna Stadmark, Sherilyn C. Fritz, Sophie Opfergelt, and Daniel J. Conley
Biogeosciences, 18, 2325–2345, https://doi.org/10.5194/bg-18-2325-2021, https://doi.org/10.5194/bg-18-2325-2021, 2021
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The drivers of high accumulation of single-cell siliceous algae (diatoms) in a high-latitude lake have not been fully characterized before. We studied silicon cycling of the lake through water, radon, silicon, and stable silicon isotope balances. Results showed that groundwater brings 3 times more water and dissolved silica than the stream inlet. We demonstrate that groundwater discharge and low sediment deposition have driven the high diatom accumulation in the studied lake in the past century.
Yu-Te Hsieh, Walter Geibert, E. Malcolm S. Woodward, Neil J. Wyatt, Maeve C. Lohan, Eric P. Achterberg, and Gideon M. Henderson
Biogeosciences, 18, 1645–1671, https://doi.org/10.5194/bg-18-1645-2021, https://doi.org/10.5194/bg-18-1645-2021, 2021
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The South Atlantic near 40° S is one of the high-productivity and most dynamic nutrient regions in the oceans, but the sources and fluxes of trace elements (TEs) to this region remain unclear. This study investigates seawater Ra-228 and provides important constraints on ocean mixing and dissolved TE fluxes to this region. Vertical mixing is a more important source than aeolian or shelf inputs in this region, but particulate or winter deep-mixing inputs may be required to balance the TE budgets.
Zhongjie Yu and Emily M. Elliott
Biogeosciences, 18, 805–829, https://doi.org/10.5194/bg-18-805-2021, https://doi.org/10.5194/bg-18-805-2021, 2021
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In this study, we demonstrated distinct nitrogen isotope effects for nitric oxide (NO) production from major microbial and chemical NO sources in an agricultural soil. These results highlight characteristic bond-forming and breaking mechanisms associated with microbial and chemical NO production and implicate that simultaneous isotopic analyses of NO and nitrous oxide (N2O) can lead to unprecedented insights into the sources and processes controlling NO and N2O emissions from agricultural soils.
Daniel A. Frick, Rainer Remus, Michael Sommer, Jürgen Augustin, Danuta Kaczorek, and Friedhelm von Blanckenburg
Biogeosciences, 17, 6475–6490, https://doi.org/10.5194/bg-17-6475-2020, https://doi.org/10.5194/bg-17-6475-2020, 2020
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Silicon is taken up by some plants to increase structural stability and to develop stress resistance and is rejected by others. To explore the underlying mechanisms, we used the stable isotopes of silicon that shift in their relative abundance depending on the biochemical transformation involved. On species with a rejective (tomato, mustard) and active (wheat) uptake mechanism, grown in hydroculture, we found that the transport of silicic acid is controlled by the precipitation of biogenic opal.
Quentin Charbonnier, Julien Bouchez, Jérôme Gaillardet, and Éric Gayer
Biogeosciences, 17, 5989–6015, https://doi.org/10.5194/bg-17-5989-2020, https://doi.org/10.5194/bg-17-5989-2020, 2020
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The abundance and isotope composition of the trace metal barium (Ba) allows us to track and quantify nutrient cycling throughout the Amazon Basin. In particular, we show that the Ba biological fingerprint evolves from that of a strong net nutrient uptake in the mountainous area of the Andes towards efficient nutrient recycling on the plains of the Lower Amazon. Our study highlights the fact that the geochemical signature of rock-derived nutrients transported by the Amazon is scarred by life.
Ajinkya G. Deshpande, Thomas W. Boutton, Ayumi Hyodo, Charles W. Lafon, and Georgianne W. Moore
Biogeosciences, 17, 5639–5653, https://doi.org/10.5194/bg-17-5639-2020, https://doi.org/10.5194/bg-17-5639-2020, 2020
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Wetland forests in the southern USA are threatened by changing climate and human-induced pressures. We used tree ring widths and C isotopes as indicators of forest growth and physiological stress, respectively, and compared these to past climate data. We observed that vegetation growing in the drier patches is susceptible to stress, while vegetation growth and physiology in wetter patches is less sensitive to unfavorable environmental conditions, highlighting the importance of optimal wetness.
Dominika Lewicka-Szczebak, Maciej Piotr Lewicki, and Reinhard Well
Biogeosciences, 17, 5513–5537, https://doi.org/10.5194/bg-17-5513-2020, https://doi.org/10.5194/bg-17-5513-2020, 2020
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We present the first validation of N2O isotopic approaches for estimating N2O source pathways and N2O reduction. These approaches are widely used for tracing soil nitrogen cycling, but the results of these estimations are very uncertain. Here we report the results from parallel treatments allowing for precise validation of these approaches, and we propose the best strategies for results interpretation, including the new idea of an isotope model integrating three isotopic signatures of N2O.
Markus Raitzsch, Claire Rollion-Bard, Ingo Horn, Grit Steinhoefel, Albert Benthien, Klaus-Uwe Richter, Matthieu Buisson, Pascale Louvat, and Jelle Bijma
Biogeosciences, 17, 5365–5375, https://doi.org/10.5194/bg-17-5365-2020, https://doi.org/10.5194/bg-17-5365-2020, 2020
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The isotopic composition of boron in carbonate shells of marine unicellular organisms is a popular tool to estimate seawater pH. Usually, many shells need to be dissolved and measured for boron isotopes, but the information on their spatial distribution is lost. Here, we investigate two techniques that allow for measuring boron isotopes within single shells and show that they yield robust mean values but provide additional information on the heterogeneity within and between single shells.
Florian Einsiedl, Anja Wunderlich, Mathieu Sebilo, Ömer K. Coskun, William D. Orsi, and Bernhard Mayer
Biogeosciences, 17, 5149–5161, https://doi.org/10.5194/bg-17-5149-2020, https://doi.org/10.5194/bg-17-5149-2020, 2020
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Nitrate pollution of freshwaters and methane emissions into the atmosphere are crucial factors in deteriorating the quality of drinking water and in contributing to global climate change. Here, we report vertical concentration and stable isotope profiles of CH4, NO3-, NO2-, and NH4+ in the water column of Fohnsee (southern Bavaria, Germany) that may indicate linkages between nitrate-dependent anaerobic methane oxidation and the anaerobic oxidation of ammonium.
Ruifang C. Xie, Frédéric A. C. Le Moigne, Insa Rapp, Jan Lüdke, Beat Gasser, Marcus Dengler, Volker Liebetrau, and Eric P. Achterberg
Biogeosciences, 17, 4919–4936, https://doi.org/10.5194/bg-17-4919-2020, https://doi.org/10.5194/bg-17-4919-2020, 2020
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Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But few studies stress the relevance of oceanic advection and diffusion on the downward 234Th fluxes in nearshore environments. Our study in offshore Peru showed strong temporal variations in both the importance of physical processes on 234Th flux estimates and the oceanic residence time of 234Th, whereas salinity-derived seawater 238U activities accounted for up to 40 % errors in 234Th flux estimates.
Ralf A. Oeser and Friedhelm von Blanckenburg
Biogeosciences, 17, 4883–4917, https://doi.org/10.5194/bg-17-4883-2020, https://doi.org/10.5194/bg-17-4883-2020, 2020
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We present a novel strategy to decipher the relative impact of biogenic and abiotic drivers of weathering. We parameterized the nutrient fluxes in four ecosystems along a climate and vegetation gradient situated on the Chilean Coastal Cordillera. We investigated how nutrient demand by plants drives weathering. We found that the increase in biomass nutrient demand is accommodated by faster nutrient recycling rather than an increase in the weathering–release rates.
Tito Arosio, Malin M. Ziehmer, Kurt Nicolussi, Christian Schlüchter, and Markus Leuenberger
Biogeosciences, 17, 4871–4882, https://doi.org/10.5194/bg-17-4871-2020, https://doi.org/10.5194/bg-17-4871-2020, 2020
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Stable isotopes in tree-ring cellulose are tools for climatic reconstructions, but interpretation is challenging due to nonclimate trends. We analyzed the tree-age trends in tree-ring isotopes of deciduous larch and evergreen cembran pine. Samples covering the whole Holocene were collected at the tree line in the Alps. For cambial ages over 100 years, we prove the absence of age trends in δD, δ18O, and δ13C for both species. For lower cambial ages, trends differ for each isotope and species.
Yuyang He, Xiaobin Cao, and Huiming Bao
Biogeosciences, 17, 4785–4795, https://doi.org/10.5194/bg-17-4785-2020, https://doi.org/10.5194/bg-17-4785-2020, 2020
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Different carbon sites in a large organic molecule have different isotope compositions. Different carbon sites may not have the chance to exchange isotopes at all. The lack of appreciation of this notion might be blamed for an unsettled debate on the thermodynamic state of an organism. Here we demonstrate using minerals, N2O, and acetic acid that the dearth of exchange among different carbon sites renders them as independent as if they were different elements in organic molecules.
Felix M. Spielmann, Albin Hammerle, Florian Kitz, Katharina Gerdel, and Georg Wohlfahrt
Biogeosciences, 17, 4281–4295, https://doi.org/10.5194/bg-17-4281-2020, https://doi.org/10.5194/bg-17-4281-2020, 2020
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Carbonyl sulfide (COS) can be used as a proxy for plant photosynthesis on an ecosystem scale. However, the relationships between COS and CO2 fluxes and their dependence on daily to seasonal changes in environmental drivers are still poorly understood. We examined COS and CO2 ecosystem fluxes above an agriculturally used mountain grassland for 6 months. Harvesting of the grassland disturbed the otherwise stable COS-to-CO2 uptake ratio. We even found the canopy to release COS during those times.
Getachew Agmuas Adnew, Thijs L. Pons, Gerbrand Koren, Wouter Peters, and Thomas Röckmann
Biogeosciences, 17, 3903–3922, https://doi.org/10.5194/bg-17-3903-2020, https://doi.org/10.5194/bg-17-3903-2020, 2020
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We measured the effect of photosynthesis, the largest flux in the carbon cycle, on the triple oxygen isotope composition of atmospheric CO2 at the leaf level during gas exchange using three plant species. The main factors that limit the impact of land vegetation on the triple oxygen isotope composition of atmospheric CO2 are identified, characterized and discussed. The effect of photosynthesis on the isotopic composition of CO2 is commonly quantified as discrimination (ΔA).
Moritz Schroll, Frank Keppler, Markus Greule, Christian Eckhardt, Holger Zorn, and Katharina Lenhart
Biogeosciences, 17, 3891–3901, https://doi.org/10.5194/bg-17-3891-2020, https://doi.org/10.5194/bg-17-3891-2020, 2020
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Fungi have recently been identified to produce the greenhouse gas methane. Here, we investigated the stable carbon isotope values of methane produced by saprotrophic fungi. Our results show that stable isotope values of methane from fungi are dependent on the fungal species and the metabolized substrate. They cover a broad range and overlap with stable carbon isotope values of methane reported for methanogenic archaea, the thermogenic degradation of organic matter, and other eukaryotes.
Pranav Hirave, Guido L. B. Wiesenberg, Axel Birkholz, and Christine Alewell
Biogeosciences, 17, 2169–2180, https://doi.org/10.5194/bg-17-2169-2020, https://doi.org/10.5194/bg-17-2169-2020, 2020
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Sediment input into water bodies is a prominent threat to freshwater ecosystems. We tested the stability of tracers employed in freshwater sediment tracing based on compound-specific isotope analysis during early degradation in soil. While bulk δ13C values showed no stability, δ13C values of plant-derived fatty acids and n-alkanes were stably transferred to the soil without soil particle size dependency after an early degradation in organic horizons, thus indicating their suitability as tracers.
Caroline Thaler, Amandine Katz, Magali Bonifacie, Bénédicte Ménez, and Magali Ader
Biogeosciences, 17, 1731–1744, https://doi.org/10.5194/bg-17-1731-2020, https://doi.org/10.5194/bg-17-1731-2020, 2020
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Paleoenvironment reconstructions, retrieved from δ18O and Δ47 values measured in carbonate, are compromised when crystallization occurs in isotopic disequilibrium. We show that some paleoenvironmental information can still be retrieved from these paired disequilibrium Δ47 and δ18O values. The possibility of retrieving information on paleowaters, sediments' interstitial waters, or organisms' body water at the carbonate precipitation loci will help understand past Earth and life evolution.
Guillaume Humbert, Mathieu Sébilo, Justine Fiat, Longqi Lang, Ahlem Filali, Véronique Vaury, Mathieu Spérandio, and Anniet M. Laverman
Biogeosciences, 17, 979–993, https://doi.org/10.5194/bg-17-979-2020, https://doi.org/10.5194/bg-17-979-2020, 2020
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Mitigating emissions of the greenhouse gas N2O requires understanding of the relative contribution of its producing processes in response to environmental variables. We show, using isotopic analysis, that N2O emissions from a nitrifying system were sensitive to oxygenation, temperature and NH4+ concentrations with nitrite reduction being the main N2O source. Temperature appears to be the main control on N2O production, due to its dissimilar effects on ammonium and nitrite oxidizing activities.
Oguz Yigiterhan, Ebrahim Mohd Al-Ansari, Alex Nelson, Mohamed Alaa Abdel-Moati, Jesse Turner, Hamood Abdulla Alsaadi, Barbara Paul, Ibrahim Abdullatif Al-Maslamani, Mehsin Abdulla Al-Ansi Al-Yafei, and James W. Murray
Biogeosciences, 17, 381–404, https://doi.org/10.5194/bg-17-381-2020, https://doi.org/10.5194/bg-17-381-2020, 2020
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We analyze net-tow samples of plankton and associated particulate matter from the Exclusive Economic Zone, Qatar, Arabian Gulf, using net tows with mesh sizes of 50 and 200 μm to examine the composition of plankton populations. We also focus on the role and composition of the atmospheric dust, representative of terrigenous material, deposited in the Gulf. We concluded that Al, Fe, Cr, Co, Mn, Ni, Pb, and Li are of dust origin and As, Cd, Cu, Mo, Zn, and Ca are of anthropogenic/biogenic origin.
Clare Woulds, James B. Bell, Adrian G. Glover, Steven Bouillon, and Louise S. Brown
Biogeosciences, 17, 1–12, https://doi.org/10.5194/bg-17-1-2020, https://doi.org/10.5194/bg-17-1-2020, 2020
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Sedimented hydrothermal vents occur where heated, mineral-rich (hydrothermal) water seeps through seafloor sediments. They host chemosynthetic microbes, which use chemical energy to fix dissolved carbon dioxide into sugars (chemosynthesis). We conducted carbon tracing experiments, and observed chemosynthesis at both vent and non-vent sites. Thus, chemosynthesis occurred over a much larger area than expected, suggesting it is more widespread than previously thought.
Cara C. Manning, Rachel H. R. Stanley, David P. Nicholson, Brice Loose, Ann Lovely, Peter Schlosser, and Bruce G. Hatcher
Biogeosciences, 16, 3351–3376, https://doi.org/10.5194/bg-16-3351-2019, https://doi.org/10.5194/bg-16-3351-2019, 2019
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We measured rates of biological activity and gas exchange in a Canadian estuary during ice melt. We quantified gas exchange using inert, deliberately released tracers and found that the gas transfer rate at > 90 % ice cover was 6 % of the rate for nearly ice-free conditions. We measured oxygen concentration and isotopic composition and used the data to detect changes in the rates of photosynthesis and respiration (autotrophy and heterotrophy) as the ice melted.
Marlène Lavrieux, Axel Birkholz, Katrin Meusburger, Guido L. B. Wiesenberg, Adrian Gilli, Christian Stamm, and Christine Alewell
Biogeosciences, 16, 2131–2146, https://doi.org/10.5194/bg-16-2131-2019, https://doi.org/10.5194/bg-16-2131-2019, 2019
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A fingerprinting approach using compound-specific stable isotopes was applied to a lake sediment core to reconstruct erosion processes over the past 150 years in a Swiss catchment. Even though the reconstruction of land use and eutrophication history was successful, the observation of comparatively low δ13C values of plant-derived fatty acids in the sediment suggests their alteration within the lake. Thus, their use as a tool for source attribution in sediment cores needs further investigation.
Luciana A. Pereira, Roberto V. Santos, Marília Hauser, Fabrice Duponchelle, Fernando Carvajal, Christophe Pecheyran, Sylvain Bérail, and Marc Pouilly
Biogeosciences, 16, 1781–1797, https://doi.org/10.5194/bg-16-1781-2019, https://doi.org/10.5194/bg-16-1781-2019, 2019
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This study presents the first step for a chemical origin certification of pirarucu fishery in the Amazon. A preliminary isotopic tool to improve the actual tracking system integrates ecological, social, and economic aspects of Amazon dynamics. The geographic origin validation of farmed and wild fishes contributes to environmental and social practices, secures food and income to communities, helps manage endangered species, reinforces aquaculture, and combats illegal fisheries.
Sarah Conrad, Johan Ingri, Johan Gelting, Fredrik Nordblad, Emma Engström, Ilia Rodushkin, Per S. Andersson, Don Porcelli, Örjan Gustafsson, Igor Semiletov, and Björn Öhlander
Biogeosciences, 16, 1305–1319, https://doi.org/10.5194/bg-16-1305-2019, https://doi.org/10.5194/bg-16-1305-2019, 2019
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Iron analysis of the particulate, colloidal, and truly dissolved fractions along the Lena River freshwater plume showed that the particulate iron dominates close to the coast. Over 99 % particulate and about 90 % colloidal iron were lost, while the truly dissolved phase was almost constant. Iron isotopes suggest that the shelf acts as a sink for particles and colloids with negative iron isotope values, while colloids with positive iron isotope values travel further out into the Arctic Ocean.
Elizabeth Verhoeven, Matti Barthel, Longfei Yu, Luisella Celi, Daniel Said-Pullicino, Steven Sleutel, Dominika Lewicka-Szczebak, Johan Six, and Charlotte Decock
Biogeosciences, 16, 383–408, https://doi.org/10.5194/bg-16-383-2019, https://doi.org/10.5194/bg-16-383-2019, 2019
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This study utilized state-of-the-art measurements of nitrogen isotopes to evaluate nitrogen cycling and to assess the biological sources of the potent greenhouse gas, N2O, in response to water-saving practices in rice systems. Water-saving practices did emit more N2O, and high N2O production had a lower 15N isotope signature. Modeling and visual interpretation indicate that these emissions mostly came from denitrification or nitrifier denitrification, controlled upstream by nitrification rates.
Feifei Deng, Gideon M. Henderson, Maxi Castrillejo, Fiz F. Perez, and Reiner Steinfeldt
Biogeosciences, 15, 7299–7313, https://doi.org/10.5194/bg-15-7299-2018, https://doi.org/10.5194/bg-15-7299-2018, 2018
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To better use Pa / Th to reconstruct deep water ventilation rate, we assessed controls on 230Th and 231Pa in the northern North Atlantic. With extended optimum multi-parameter analysis and CFC-based water-mass age, we found the imprint of young overflow water on Th and Pa and enhanced scavenging near the seafloor. A significantly higher advective loss of Pa to the south relative to Th in the Atlantic was estimated, supporting the use of Pa / Th for assessing basin-scale meridional transport.
Cited articles
Aber, J. D., Nadelhoffer, K. J., Steudler, P., and Melillo, J. M.: Nitrogen
Saturation in Northern Forest Ecosystems, Bioscience, 39, 378–386, 1989.
Aber, J. D., Goodale, C. L., Ollinger, S. V., Smith, M.-L., Magill, A. H.,
Martin, M. E., Hallett, R. A., and Stoddard, J. L.: Is nitrogen deposition
altering the nitrogen status of northeastern forests?, Bioscience, 53,
375–389, 2003.
Aikawa, M., Hiraki, T., Tamaki, M., and Shoga, M.: Difference between
filtering-type bulk and wet-only data sets based on site classification,
Atmos. Environ., 37, 2597–2603, 2003.
Alexander, B., Hastings, M. G., Allman, D. J., Dachs, J., Thornton, J. A.,
and Kunasek, S. A.: Quantifying atmospheric nitrate formation pathways based
on a global model of the oxygen isotopic composition (Δ17O) of
atmospheric nitrate, Atmos. Chem. Phys., 9, 5043–5056,
https://doi.org/10.5194/acp-9-5043-2009, 2009
Berner, E. K. and Berner, R. A.: The global water cycle: geochemistry and
environment, Englewood Cliffs, NJ, Prentice-Hall, 1987.
Bourgeois, I., Savarino, J., Caillon, N., Angot, H., Barbero, A., Delbart,
F., Voisin, D., and Clément, J.-C.: Tracing the fate of atmospheric
nitrate in a subalpine watershed using Δ17O, Environ. Sci.
Technol., 52, 5561–5570, 2018a.
Bourgeois, I., Savarino, J., Némery, J., Caillon, N., Albertin, S.,
Delbart, F., Voisin, D., and Clément, J.-C.: Atmospheric nitrate export
in streams along a montane to urban gradient, Sci. Total Environ., 633,
329–340, 2018b.
Breuer, L., Kiese, R., and Butterbach-Bahl, K.: Temperature and moisture
effects on nitrification rates in tropical rain-forest soils, Soil Sci. Soc.
Am. J., 66, 834–844, 2002.
Buchwald, C., Santoro, A. E., McIlvin, M. R., and Casciotti, K. L.: Oxygen
isotopic composition of nitrate and nitrite produced by nitrifying cocultures
and natural marine assemblages, Limnol. Oceanogr., 57, 1361–1375, 2012.
Clow, D. W., Roop, H. A., Nanus, L., Fenn, M. E., and Sexstone, G. A.:
Spatial patterns of atmospheric deposition of nitrogen and sulfur using
ion-exchange resin collectors in Rocky Mountain National Park, USA, Atmos.
Environ., 101, 149–157, 2015.
Costa, A. W., Michalski, G., Schauer, A. J., Alexander, B., Steig, E. J., and
Shepson, P. B.: Analysis of atmospheric inputs of nitrate to a temperate
forest ecosystem from Δ17O isotope ratio measurements,
Geophys. Res. Lett., 38, L15805, https://doi.org/10.1029/2011GL047539, 2011.
Dansgaard, W.: Stable isotopes in precipitation, Tellus, 16, 436–468, 1964.
Dejwakh, N. R., Meixner, T., Michalski, G., and McIntosh, J.: Using
17O to investigate nitrate sources and sinks in a semi-arid
groundwater system, Environ. Sci. Technol., 46, 745–751, 2012.
Durka, W., Schulze, E.-D., Gebauer, G., and Voerkeliust, S.: Effects of
forest decline on uptake and leaching of deposited nitrate determined from
15N and 18O measurements, Nature, 372, 765–767, 1994.
EANET: Data Report 2013, Network center for EANET (Acid Deposition Monitoring
Network in East Asia), Nigata, Japan, 2014.
EANET: Data Report 2014, Network center for EANET (Acid Deposition Monitoring
Network in East Asia), Nigata, Japan, 2015.
Hirota, A., Tsunogai, U., Komatsu, D. D., and Nakagawa, F.: Simultaneous
determination of δ15N and δ18O of N2O
and δ13C of CH4 in nanomolar quantities from a single
water sample, Rapid Commun. Mass Sp., 24, 1085–1092, 2010.
Hoyle, F. C., Murphy, D. V., and Fillery, I. R. P.: Temperature and stubble
management influence microbial CO2−C evolution and gross N
transformation rates, Soil Biol. Biochem., 38, 71–80, 2006.
Kabeya, N., Katsuyama, M., Kawasaki, M., Ohte, N., and Sugimoto, A.:
Estimation of mean residence times of subsurface waters using seasonal
variation in deuterium excess in a small headwater catchment in Japan,
Hydrol. Process., 21, 308–322, 2007.
Kaiser, J., Hastings, M. G., Houlton, B. Z., Röckmann, T., and Sigman, D.
M.: Triple oxygen isotope analysis of nitrate using the denitrifier method
and thermal decomposition of N2O, Anal. Chem., 79, 599–607, 2007.
Kamisako, M., Sase, H., Matsui, T., Suzuki, H., Takahashi, A., Oida, T.,
Nakata, M., Totsuka, T., and Ueda, H.: Seasonal and annual fluxes of
inorganic constituents in a small catchment of a Japanese cedar forest near
the Sea of Japan, Water Air Soil Poll., 195, 51–61, 2008.
Kendall, C.: Tracing Nitrogen Sources and Cycling in Catchments, in: Isotope
Tracers in Catchment Hydrology, edited by: Kendall, C. and McDonnell, J. J.,
Elsevier Science B.V., Amsterdam, 519–576, 1998.
Kendall, C., Campbell, D. H., Burns, D. A., Schanley, J. B., Silva, S. R.,
and Chang, C. C. Y.: Tracing sources of nitrate in snowmelt runoff using the
oxygen and nitrogen isotopic compositions of nitrate, in: Biogeochemistry of
seasonally snow-covered catchments, Proceedings of a Boulder Symposium,
Boulder, Co., 3–14 July 1995, IAHS Publication No. 228, 339–347, 1995.
Kendall, C., Elliott, E. M., and Wankel, S. D.: Tracing anthropogenic inputs
of nitrogen to ecosystems, in: Stable Isotopes in Ecology and Environmental
Science, 2nd edn., edited by: Michener, R. H. and Lajtha, K., Blackwell
Publishing, Oxford, UK, 2007.
Komatsu, D. D., Ishimura, T., Nakagawa, F., and Tsunogai, U.: Determination
of the 15N ∕ 14N, 17O ∕ 16O,
and 18O ∕ 16O ratios of nitrous oxide by using
continuous-flow isotope-ratio mass spectrometry, Rapid Commun. Mass Sp., 22,
1587–1596, 2008.
Konno, U., Tsunogai, U., Komatsu, D. D., Daita, S., Nakagawa, F., Tsuda, A.,
Matsui, T., Eum, Y.-J., and Suzuki, K.: Determination of total N2
fixation rates in the ocean taking into account both the particulate and
filtrate fractions, Biogeosciences, 7, 2369–2377,
https://doi.org/10.5194/bg-7-2369-2010, 2010.
Koshikawa, M., Watanabe, M., Takamatsu, T., Hayashi, S., Nohara, S., and
Satake, K.: Relationships between stream water chemistry and watershed
geology and topography in the Miomote River System, Niigata, Japan, Jap. J.
Limnol., 72, 71–80, 2011 (in Japanese with English abstract).
Liu, T., Wang, F., Michalski, G., Xia, X., and Liu, S.: Using 15N,
17O, and 18O To Determine Nitrate Sources in the Yellow
River, China, Environ. Sci. Technol., 47, 13412–13421,
https://doi.org/10.1021/es403357m, 2013.
McIlvin, M. R. and Altabet, M. A.: Chemical conversion of nitrate and nitrite
to nitrous oxide for nitrogen and oxygen isotope analysis in freshwater and
seawater, Anal. Chem., 77, 5589–5595, 2005.
McIsaac, G. F., David, M. B., Gertner, G. Z., and Goolsby, D. A.:
Eutrophication: Nitrate flux in the Mississippi River, Nature, 414, 166–167,
2001.
Michalski, G., Savarino, J., Böhlke, J. K., and Thiemens, M.:
Determination of the total oxygen isotopic composition of nitrate and the
calibration of a Δ17O nitrate reference material, Anal. Chem.,
74, 4989–4993, 2002.
Michalski, G., Scott, Z., Kabiling, M., and Thiemens, M. H.: First
measurements and modeling of Δ17O in atmospheric nitrate,
Geophys. Res. Lett., 30, 1870, https://doi.org/10.1029/2003GL017015, 2003.
Michalski, G., Meixner, T., Fenn, M., Hernandez, L., Sirulnik, A., Allen, E.,
and Thiemens, M.: Tracing Atmospheric Nitrate Deposition in a Complex
Semiarid Ecosystem Using Δ17O, Environ. Sci. Technol., 38,
2175–2181, 2004.
Miller, M. F.: Isotopic fractionation and the quantification of 17O
anomalies in the oxygen three-isotope system: an appraisal and geochemical
significance, Geochim. Cosmochim. Ac., 66, 1881–1889, 2002.
Mitchell, M. J., Iwatsubo, G., Ohrui, K., and Nakagawa, Y.: Nitrogen
saturation in Japanese forests: an evaluation, Forest Ecol. Manag., 97,
39–51, 1997.
Morin, S., Savarino, J., Frey, M. M., Yan, N., Bekki, S., Bottenheim, J. W.,
and Martins, J. M. F.: Tracing the origin and fate of NOx in
the Arctic atmosphere using stable isotopes in nitrate, Science, 322,
730–732, 2008.
Nakagawa, F., Suzuki, A., Daita, S., Ohyama, T., Komatsu, D. D., and
Tsunogai, U.: Tracing atmospheric nitrate in groundwater using triple oxygen
isotopes: evaluation based on bottled drinking water, Biogeosciences, 10,
3547–3558, https://doi.org/10.5194/bg-10-3547-2013, 2013.
Nakahara, O., Takahashi, M., Sase, H., Yamada, T., Matsuda, K., Ohizumi, T.,
Fukuhara, H., Inoue, T., Takahashi, A., Kobayashi, H., Hatano, R., and
Hakamata, T.: Soil and stream water acidification in a forested catchment in
central Japan, Biogeochemistry, 97, 141–158, 2010.
Nelson, D. M., Tsunogai, U., Ding, D., Ohyama, T., Komatsu, D. D., Nakagawa,
F., Noguchi, I., and Yamaguchi, T.: Triple oxygen isotopes indicate
urbanization affects sources of nitrate in wet and dry atmospheric
deposition, Atmos. Chem. Phys., 18, 6381–6392,
https://doi.org/10.5194/acp-18-6381-2018, 2018.
Ogawa, S.: Forests and water resources, chap. 3, in: Hydrological Cycle and
Local Metabolic System of Water, edited by: Tambo, N. and Maruyama, T.,
Gihodo, 2003 (in Japanese).
Ohte, N., Sebestyen, S. D., Shanley, J. B., Doctor, D. H., Kendall, C.,
Wankel, S. D., and Boyer, E. W.: Tracing sources of nitrate in snowmelt
runoff using a high-resolution isotopic technique, Geophys. Res. Lett., 31,
L21506, https://doi.org/10.1029/2004GL020908, 2004.
Paerl, H. W.: Controlling eutrophication along the freshwater–marine
continuum: Dual nutrient (N and P) reductions are essential, Estuar. Coast.,
32, 593–601, 2009.
Pellerin, B., Saraceno, J., Shanley, J., Sebestyen, S., Aiken, G., Wollheim,
W., and Bergamaschi, B.: Taking the pulse of snowmelt: in situ sensors reveal
seasonal, event and diurnal patterns of nitrate and dissolved organic matter
variability in an upland forest stream, Biogeochemistry, 108, 183–198, 2012.
Peterjohn, W. T., Adams, M. B., and Gilliam, F. S.: Symptoms of nitrogen
saturation in two central Appalachian hardwood forest ecosystems,
Biogeochemistry, 35, 507–522, 1996.
Piatek, K. B., Mitchell, M. J., Silva, S. R., and Kendall, C.: Sources of
nitrate in snowmelt discharge: evidence from water chemistry and stable
isotopes of nitrate, Water Air Soil Poll., 165, 13–35, 2005.
Riha, K. M., Michalski, G., Gallo, E. L., Lohse, K. A., Brooks, P. D., and
Meixner, T.: High Atmospheric Nitrate Inputs and Nitrogen Turnover in
Semi-arid Urban Catchments, Ecosystems, 17, 1309–1325, 2014.
Rose, L. A., Elliott, E. M., and Adams, M. B.: Triple Nitrate Isotopes
Indicate Differing Nitrate Source Contributions to Streams Across a Nitrogen
Saturation Gradient, Ecosystems, 18, 1209–1223, 2015a.
Rose, L. A., Sebestyen, S. D., Elliott, E. M., and Koba, K.: Drivers of
atmospheric nitrate processing and export in forested catchments, Water
Resour. Res., 51, 1333–1352, 2015b.
Sabo, R. D., Nelson, D. M., and Eshleman, K. N.: Episodic, seasonal, and
annual export of atmospheric and microbial nitrate from a temperate forest,
Geophys. Res. Lett., 43, 683–691, https://doi.org/10.1002/2015GL066758, 2016.
Sase, H., Takahashi, A., Sato, M., Kobayashi, H., Nakata, M., and Totsuka,
T.: Seasonal variation in the atmospheric deposition of inorganic
constituents and canopy interactions in a Japanese cedar forest, Environ.
Pollut., 152, 1–10, 2008.
Sase, H., Matsuda, K., Visaratana, T., Garivait, H., Yamashita, N.,
Kietvuttinon, B., Hongthong, B., Luangjame, J., Khummongkol, P., Shindo, J.,
Endo, T., Sato, K., Uchiyama, S., Miyazawa, M., Nakata, M., and Lenggoro, I.
W.: Deposition Process of Sulfate and Elemental Carbon in Japanese and Thai
Forests, Asian Journal of Atmospheric Environment, 6, 246–258, 2012.
Sase, H., Ohizumi, T., Yamashita, N., Visaratana, T., Kietvuttinon, B.,
Garivait, H., and Majid, N. M.: Dynamics of Sulphur Derived from Atmospheric
Deposition and its Possible Impacts on East Asian Forests, Final Report
submitted to APN (Project Refence Number: ARCP2013-13CMY-Sase), Asia-Pacific
Network for Global Change Research, Kobe, Japan, 2015.
Shibata, H., Kuraji, K., Toda, H., and Sasa, K.: Regional Comparison of
Nitrogen Export to Japanese Forest Streams, Sci. World J., 1, 572–580,
https://doi.org/10.1100/tsw.2001.371, 2001.
Stoddard, J. L.: Long-Term Changes in Watershed Retention of Nitrogen: Its
Causes and Aquatic Consequences. In: Environmental Chemistry of Lakes and
Reservoirs, Baker, L. A. (Ed.), Advances in Chemistry Series, American
Chemical Society, Washington DC, 1994.
Takagi, K., Fukuzawa, K., Liang, N., Kayama, M., Nomura, M., Hojyo, H.,
Sugata, S., Shibata, H., Fukazawa, T., Takahashi, Y., Nakaji, T., Oguma, H.,
Mano, M., Akibayashi, Y., Murayama, T., Koike, T., Sasa, K., and Fujinuma,
Y.: Change in CO2 balance under a series of forestry activities in a
cool-temperate mixed forest with dense undergrowth, Glob. Change Biol., 15,
1275–1288, 2009.
Takimoto, H., Tanaka, T., and Horino, H.: Does forest conserve runoff
discharge during drought?, Transactions of The Japanese Society of
Irrigation, Drainage and Reclamation Engineering, 170, 75–81,
https://doi.org/10.11408/jsidre1965.1994.170_75, 1994 (in Japanese with English
abstract).
Tanoue, M., Ichiyanagi, K., and Shimada, J.: Seasonal variation and spatial
distribution of stable isotopes in precipitation over Japan, Journal of
Japanese Association of Hydrological Sciences, 43, 73–91, 2013 (in Japanese
with English abstract).
Thiemens, M. H., Savarino, J., Farquhar, J., and Bao, H.: Mass-Independent
Isotopic Compositions in Terrestrial and Extraterrestrial Solids and Their
Applications, Accounts Chem. Res., 34, 645–652, 2001.
Tsunogai, U., Kido, T., Hirota, A., Ohkubo, S. B., Komatsu, D. D., and
Nakagawa, F.: Sensitive determinations of stable nitrogen isotopic
composition of organic nitrogen through chemical conversion into N2O,
Rapid Commun. Mass Sp., 22, 345–354, 2008.
Tsunogai, U., Komatsu, D. D., Daita, S., Kazemi, G. A., Nakagawa, F.,
Noguchi, I., and Zhang, J.: Tracing the fate of atmospheric nitrate deposited
onto a forest ecosystem in Eastern Asia using Δ17O, Atmos.
Chem. Phys., 10, 1809–1820, https://doi.org/10.5194/acp-10-1809-2010, 2010.
Tsunogai, U., Daita, S., Komatsu, D. D., Nakagawa, F., and Tanaka, A.:
Quantifying nitrate dynamics in an oligotrophic lake using Δ17O, Biogeosciences, 8, 687–702, https://doi.org/10.5194/bg-8-687-2011, 2011.
Tsunogai, U., Komatsu, D. D., Ohyama, T., Suzuki, A., Nakagawa, F., Noguchi,
I., Takagi, K., Nomura, M., Fukuzawa, K., and Shibata, H.: Quantifying the
effects of clear-cutting and strip-cutting on nitrate dynamics in a forested
watershed using triple oxygen isotopes as tracers, Biogeosciences, 11,
5411–5424, https://doi.org/10.5194/bg-11-5411-2014, 2014.
Tsunogai, U., Miyauchi, T., Ohyama, T., Komatsu, D. D., Nakagawa, F., Obata,
Y., Sato, K., and Ohizumi, T.: Accurate and precise quantification of
atmospheric nitrate in streams draining land of various uses by using triple
oxygen isotopes as tracers, Biogeosciences, 13, 3441–3459,
https://doi.org/10.5194/bg-13-3441-2016, 2016.
Tsunogai, U., Miyauchi, T., Ohyama, T., Komatsu, D. D., Ito, M., and
Nakagawa, F.: Quantifying nitrate dynamics in a mesotrophic lake using triple
oxygen isotopes as tracers, Limnol. Oceanogr., 63, S458–S476, 2018.
Wright, R. F. and Tietema, A.: Ecosystem response to 9 years of nitrogen
addition at Sogndal, Norway, Forest Ecol. Manag., 71, 133–142, 1995.
Yamada, T., Inoue, T., Fukuhara, H., Nakahara, O., Izuta, T., Suda, R.,
Takahashi, M., Sase, H., Takahashi, A., Kobayashi, H., Ohizumi, T., and
Hakamata, T.: Long-term Trends in Surface Water Quality of Five Lakes in
Japan, Water Air Soil Poll.: Focus, 7, 259–266, 2007.
Yamazaki, A., Watanabe, T., and Tsunogai, U.: Nitrogen isotopes of organic
nitrogen in reef coral skeletons as a proxy of tropical nutrient dynamics,
Geophys. Res. Lett., 38, L19605, https://doi.org/10.1029/2011GL049053, 2011.
Zaman, M. and Chang, S. X.: Substrate type, temperature, and moisture content
affect gross and net N mineralization and nitrification rates in agroforestry
systems, Biol. Fert. Soils, 39, 269–279, 2004.
Short summary
To clarify the biological processing of nitrate within temperate forested catchments using unprocessed atmospheric nitrate exported from each catchment as a tracer, we continuously monitored stream nitrate concentrations and stable isotopic compositions in three forested catchments for more than 2 years. We concluded that the export flux of unprocessed atmospheric nitrate relative to the deposition flux in each forest ecosystem is applicable as an index for nitrogen saturation.
To clarify the biological processing of nitrate within temperate forested catchments using...
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