Articles | Volume 12, issue 13
https://doi.org/10.5194/bg-12-3941-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-12-3941-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
01 Jul 2015
Research article |
| 01 Jul 2015
Spatiotemporal analysis of nitrogen cycling in a mixed coniferous forest of the northern United States
Department of Geosciences, University of Arkansas, 216 Ozark Hall, Fayetteville, AR 72701, USA
K. K. McLauchlan
Department of Geography, Kansas State University, 118 Seaton Hall, Manhattan, KS 66506, USA
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Matthew L. Trumper, Daniel Griffin, Sarah E. Hobbie, Ian M. Howard, David M. Nelson, Peter B. Reich, and Kendra K. McLauchlan
Biogeosciences, 17, 4509–4522, https://doi.org/10.5194/bg-17-4509-2020, https://doi.org/10.5194/bg-17-4509-2020, 2020
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We developed century-scale records of wood nitrogen isotopes (δ15N) from 16 trees across a long-term savanna fire experiment. Results show similar long-term trajectories in three out of four burn treatments. Lack of evidence to support our hypotheses underscores the complexity of nitrogen dynamics inferred from wood δ15N. This is the first study to our knowledge to investigate multi-decadal effects of fire at different return intervals on wood δ15N, a potential proxy of nitrogen availability.
Matthew L. Trumper, Daniel Griffin, Sarah E. Hobbie, Ian M. Howard, David M. Nelson, Peter B. Reich, and Kendra K. McLauchlan
Biogeosciences, 17, 4509–4522, https://doi.org/10.5194/bg-17-4509-2020, https://doi.org/10.5194/bg-17-4509-2020, 2020
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We developed century-scale records of wood nitrogen isotopes (δ15N) from 16 trees across a long-term savanna fire experiment. Results show similar long-term trajectories in three out of four burn treatments. Lack of evidence to support our hypotheses underscores the complexity of nitrogen dynamics inferred from wood δ15N. This is the first study to our knowledge to investigate multi-decadal effects of fire at different return intervals on wood δ15N, a potential proxy of nitrogen availability.
S. Y. Maezumi, M. J. Power, F. E. Mayle, K. K. McLauchlan, and J. Iriarte
Clim. Past, 11, 835–853, https://doi.org/10.5194/cp-11-835-2015, https://doi.org/10.5194/cp-11-835-2015, 2015
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A 14,500-year, high-resolution, sedimentary record from Huanchaca Mesetta, a palm swamp located in the cerrãdo savanna in northeastern Bolivia, was analyzed for phytoliths, stable isotopes and charcoal. A non-analogue, cold-adapted vegetation community dominated the Late Glacial-Early Holocene period (14.5-9ka), which included trees and C3 Pooideae and C4 Panicoideae grasses. The Late Glacial vegetation was fire sensitive and fire activity during this period was low, likely responding to fuel av
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Roberto Velázquez-Ochoa, María Julia Ochoa-Izaguirre, and Martín Federico Soto-Jiménez
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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.
Anne L. Morée, Jörg Schwinger, and Christoph Heinze
Biogeosciences, 15, 7205–7223, https://doi.org/10.5194/bg-15-7205-2018, https://doi.org/10.5194/bg-15-7205-2018, 2018
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Changes in the distribution of the carbon isotope 13C can be used to study the climate system if the governing processes (ocean circulation and biogeochemistry) are understood. We show the Southern Ocean importance for the global 13C distribution and that changes in 13C can be strongly influenced by biogeochemistry. Interpretation of 13C as a proxy for climate signals needs to take into account the effects of changes in biogeochemistry in addition to changes in ocean circulation.
Cited articles
Ahlgren, C. E.: Regeneration of red pine and white pine following wildfire and logging in northeastern Minnesota, J. Forest., 74, 135–140, https://doi.org/10.3375/043.029.0208, 1975.
Alexandersson, H.: A homogeneity test applied to precipitation data, J. Climatol., 6, 661–675, https://doi.org/10.1002/joc.3370060607, 1986.
Beaulieu, C., Chen, J., and Sarmiento, J.L .: Change-point analysis as a tool to detect abrupt climate variations, Philos. T. R. Soc. A., 370, 1228–1249, https://doi.org/10.1175/JCLI4291.1, 2012.
Beghin, R., Cherubini, P., Battipaglia, G., Siegwolf, R., Saurer, M., and Bovio, G.: Tree-ring growth and stable isotopes (δ13 C and δ15N) detect effects of wildfires on tree physiological processes in Pinus sylvestris L, Trees, 25, 627–636, https://doi.org/10.1007/s00468-011-0539-9, 2011.
Bernal, S., Hedin, L. O., Likens, G. E., Gerber, S., and Buso, D. C.: Complex response of the forest nitrogen cycle to climate change, P. Natl. Acad. Sci. USA, 109, 3406–3411, https://doi.org/10.1073/pnas.1121448109, 2012.
Brisson, J., Bergeron, Y., and Bouchard, A.: Secondary succession on mesic sites in the Upper St. Lawrence Region, Quebec, Canada, Can. J. Bot., 6, 1192–1203, https://doi.org/10.1139/b88-170, 1988.
Buishand, T. A.: Tests for detecting a shift in the mean of a hydrological time series, J. Hydrol., 73, 51–69, https://doi.org/10.1016/0022-1694(84)90032-5, 1984.
Bukata, A. R., and Kyster, T. K.: Carbon and nitrogen isotope variations in tree-rings as records of perturbations in regional carbon and nitrogen cycles, Env. Sci. Tech., 41, 1331–1338, https://doi.org/10.1021/es061414g, 2007.
Cacerces, M. K., Mizota, C., Yamanaka, T., and Nobori, Y.: Effects of pre-treatment on the nitrogen isotope composition of Japanese black pine (Pinus thunbergii) tree-rings as affected by high N input, Rapid Commun. Mass Spectrom, 21, 3298–3302, https://doi.org/10.1002/rcm.5227, 2011.
Clark, J. S.: Effect of climate change on fire regimes in northwestern Minnesota, Nature 334, 233–235, https://doi.org/10.1038/334233a0, 1988.
Clark, J. S.: Effects of long-term water balances on fire regime, north-western Minnesota, J. Ecol, 77, 989–1004, 1989.
Clark, J. S.: Landscape interactions among nitrogen mineralization, species composition, and long-term fire frequency, Biogeochemistry, 11, 1–22, https://doi.org/10.1007/BF00000849, 1990a.
Clark, J. S.: Fire and climate change during the last 750 yr in northwestern Minnesota, Ecol. Monogr., 60, 135–159, https://doi.org/10.2307/1943042, 1990b.
Craine, J. M., Elmore, A. J., Aidar, P., Bustamante, M., Dawson, T. E., Hobbie, E. A., Ansgar, K., Mack, M. C., McLauchlan, K. K., Michelsen, A., Nardoto, G. B., Pardo, L. H., Peñuelas, J., Reich, P. B., Schuur, E. A. G., Stock, W. D., Templer, P. H., Virginia, R. A., Welker, J. M., and Wright, J. A: Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability, New Phytol., 183, 980–992, https://doi.org/10.1111/j.1469-8137.2009.02917.x, 2009.
Cuoto-Vázquez, A. and González-Prieto, S. J.: Effects of climate, tree age, dominance and growth on δ15N in young pinewoods, Trees, 24, 507–514, https://doi.org/10.1007/s00468-010-0420-2, 2010.
D'Amato, A. W., Palik, B. J., and Kern, C. C.: Growth, yield, and structure of extended rotation Pinus resinosa stands in Minnesota, USA, Can. J. For. Res., 40, 1000–1010, https://doi.org/10.1139/X10-041, 2010.
Doucet, A., Savard, M. M., Bégin, C., and Smirnoff, A.: Is pre-treatment essential for tree-ring nitrogen concentration and isotope analysis?, Rapid Commun. Mass Spec., 25, 469–475, https://doi.org/10.1002/rcm.4876, 2011.
Fraver, S., Palik, B. J., and Brian, J.: Stand cohort structures of old-growth Pinus resinosa- dominated forests of northern Minnesota, USA, J. Veg. Sci., 23, 249–259, https://doi.org/10.1111/j.1654-1103.2011.01348.x, 2012.
Frissell, J.: The importance of fire as a natural ecological factor in Itasca State Park, Minnesota, Quaternary Res., 3, 397–407, https://doi.org/10.1016/0033-5894(73)90005-7, 1973.
Galloway, J. N., Dentenner, F. J., Capone, D. G., Boyer, E. W., Howarth, R. W., Seitzinger, S. P., Asner, G. P., Cleveland, C. C., Green, P. A., Holland, E. A., Karl, D. M., Michaels, A. F., Porter, J. H., Townsend, A. R., and Vöosmarty, C. J.: Nitrogen cycles: past, present, and future, Biogeochemistry, 70, 153–226, https://doi.org/10.1007/s10533-004-0370-0, 2004.
Gerhart, L. and McLauchlan, K. K.: Reconstructing terrestrial nutrient cycling using stable nitrogen isotopes in wood, Biogeochemistry, 120, 1–21, https://doi.org/10.1007/s10533-014-9988-8, 2014.
Guerreiro, S., Kilsby, C. G., and Serinaldi, F.: Analysis of time variation of rainfall in transnational basins in Iberia: abrupt changes or tends?, Int. J. Climatol., 34, 114–133, https://doi.org/10.1002/joc.3669, 2013.
Hietz, P., Dünish, O., and Wanek, W.: Long-term trends in nitrogen isotope composition and nitrogen concentration in Brazilian rainforest trees suggest changes in nitrogen cycle, Env. Sci. Tech., 44, 1191–1196, https://doi.org/10.1021/es901383g, 2010.
Hietz, P., Turner, B. L., Wanek, W., and Richter, A., Nock, C. A., and Wright, S. J.: Long-term change in nitrogen cycle of tropical forests, Science, 334, 664–666, https://doi.org/10.1126/science.1211979, 2011.
Hobbie, J. E. and Colpaert, J. V.: Nitrogen availability and colonization by mycorrhizal fungi correlate with nitrogen isotope patterns in plants, New Phytol., 157, 115–126, https://doi.org/10.1046/j.1469-8137.2003.00657.x, 2003.
Hobbie, J. E. and Hobbie, E. A.: 15N in symbiotic fungi and plants estimates nitrogen and carbon flux rates in arctic tundra, Ecology, 87, 816–822, https://doi.org/10.1890/0012-9658(2006)87[816:NISFAP]2.0.CO;2, 2006.
Houlton, B. Z., Sigman, D. M., and Hedin, L. O.: Isotopic evidence for large gaseous nitrogen losses from tropical rainforests, P. Natl. Acad. Sci. USA, 103, 8745–8750, https://doi.org/10.1073/pnas.0510185103, 2006.
Houlton, B. Z., Boyer, E., Finzi, Adrien, Galloway, J., Leach, A., Liptzin, D., Melillo, J., Rosenstock, T. S., Sobota, and D., Townsend, A. R.: Intentional versus unintentional nitrogen use in the United States: trends, efficiency and implications, Biogeochemistry, 114, 11–23, https://doi.org/10.1007/s10533-012-9801-5, 2013.
Jussy, J. H., Colin-Belgrand, M., and Ranger, J.: Production and root uptake of mineral nitrogen in a chronosequence of Douglas-fir (Pseudotsuga menziesii) in the Beaujoalis Mountains, Forest Ecol. Manage., 128, 197–209, https://doi.org/10.1007/s10533-012-9801-5, 2000.
Kareiva, P., Watts, S., McDonald, R., and Boucher, T.: Domesticated nature: shaping landscapes and ecosystems for human welfare, Science, 316, 1866–1869, https://doi.org/10.1126/science.1140170, 2007.
Kurmis, V. and Sucoff, E.: Population density and height distribution of Corylus cornuta in undisturbed forests of Minnesota, Can. J. Bot., 67, 2409–2413, https://doi.org/10.1139/b89-308, 1989.
MacKenzie, M. D., Luca, T. H., and Sala, A.: Fire exclusion and nitrogen mineralization in low elevation forests of western Montana, Soil Biol. Biochem., 38, 952–961, https://doi.org/10.1016/j.soilbio.2005.08.008, 2006.
Mann, H. B.: Non-parametric test against trend, Econometrica, 13, 245–249, https://doi.org/10.1080/10629360600564924, 1945.
McLauchlan, K. K. and Craine, J. M.: Species-specific trajectories of nitrogen isotopes in Indiana hardwood forests, USA, Biogeosciences, 9, 867–874, https://doi.org/10.5194/bg-9-867-2012, 2012.
McLauchlan, K. K., Craine, J. M., Oswald, W. W., Leavitt, P. R., and Likens, G. E.: Changes in nitrogen cycling during the past century in a northern hardwood forest, P. Natl. Acad. Sci. USA, 104, 7466–7470, https://doi.org/10.1073/pnas.0701779104, 2007.
McLauchlan, K. K., Williams, J. J., Craine, J. M., and Jeffers, E. S.: Changes in global nitrogen cycling during the Holocene epoch, Nature, 495, 352–355, https://doi.org/10.1038/nature11916, 2013a.
McLauchlan, K. K., Lascu, I., Myrbo, A., and Leavitt, P. R.: Variable ecosystem response to climate change during the Holocene in northern Minnesota, USA, Geol. Soc. Am. Bull., 125, 445–452, https://doi.org/10.1130/B30737.1, 2013b.
Minnesota Department of Natural Resources: Itasca State Park management plan, http://files.dnr.state.mn.us/parks_trails/mgmtplans/itasca_plan.pdf (last access: 13 February 2015), 1998.
National Atmospheric Deposition Program: 2013 Annual Summary, http://nadp.sws.uiuc.edu/lib/data/2013as.pdf (last access: 21 April 2015), 2013.
National Climatic Data Center: Climatography of the United States, 1971–2000, http://www.ncdc.noaa.gov/DLYNRMS/dnrm?coopid=214106 (last access: 23 April 2015), 2000.
Nave, L. E., Gough, C. M., Maurer, K. D., Bohrer, G., Hardiman, B. S., Moine, M. Le Munoz, A. B., Nadelhoffer, K. J., Sparks, J. P., Strahm, B. D., Vogel, C. S., and Curtis, P. S.: Disturbance and the resilience of coupled carbon and nitrogen cycling in a northern temperate forest, J. Geophys. Res-Biogeo., 116, G04016, https://doi.org/10.1029/2011JG001758, 2011.
Pardo, L. H., Hemond, H. F., Montoya, J. P., Fahey, T. J., and Sicama, T. G.: Response of the natural abundance of N-15 in forest soils and foliage to high nitrate loss following clear-cutting, Can. J. Forest., 32, 1126–1136, https://doi.org/10.1139/x02-041, 2002.
Pardo, L. H., Templer, P. H., Goodale, C. L., Duke, Duke, S., Groffman, P. M., Adams, M. B., Boeckx, P., Boggs, J., Campbell, J., Colman, B., Compton, J., Emmett, B., Gundersen, P., Kjønaas, Lovett, G., Mack, M., Magill, A., Mbila, M., Mitchell, M. J., McGee, G., McNulty, S., Nadelhoffer, K., Ollinger, S., Ross, D., Rueth, H., Rustad, L., Schaberg, P., Schiff, S., Schleppi, P., Spoelstra, J., and Wessel, W.: Regional assessment of N saturation using foliar and root delta N-15, Biogeochemistry, 80, 143–171, https://doi.org/10.1007/s10533-006-9015-9, 2006.
Peet, R. K.: Twenty-six years of change in a Pinus strobus, Acer saccharum forest, Lake Itasca, Minnesota, B. Torrey Bot. Club, 111, 61–68, https://doi.org/10.3375/043.029.0208, 1984.
Pettitt, A. N.: A nonparametric approach to the changepoint problem, Applied Statistician, 28, 126–135, https://doi.org/10.2307/2346729, 1979.
Poulson, S. R., Chamberlian, C. P., and Friedland, A. J.: Nitrogen isotope variation of tree rings as a potential indicator of environmental change, Chem. Geol., 125, 307–315, https://doi.org/10.1016/0009-2541(95)00097-6, 1995.
Rebstock, G. A.: Climatic regime shifts in decadal-scale variability in calanoid copepod populations off southern California, Glob. Change Biol., 8, 71–89, https://doi.org/10.1046/j.1365-2486.2002, 2002.
Santoro, A. E., Lombardero, M. J., Ayres, M. P., and Ruel, J. J.: Interactions between fire and bark beetles in an old growth pine forest, Forest Ecol. Manag., 5148, 1–10, https://doi.org/10.1016/S0378-1127(00)00389-3, 2001.
Sen, P. K.: Estimates of the regression coefficient based on Kendall's tau, J. Am. Stat. Assoc., 63, 1379–1389, https://doi.org/10.1080/01621459.1968.10480934, 1968.
Silver, E. J., Fraver, S., D'Amato, A. W., Aakala, T., and Palik, B. J.: Long-term mortality rates and spatial patterns in an old-growth Pinus resinosa forest, Can. J. Forest., 43, 809–816, https://doi.org/10.1139/cjfr-2013-0139, 2013.
Smithwick, E. A. H., Turner, M. G., Mack, M. C., and Chapin, F. S.: Postfire Soil N Cycling in Northern Conifer Forests Affected by Severe, Stand-Replacing Wildfires, Ecosystems, 8, 163–181, 2005.
Spurr, S. H.: The forest of Itasca in the Nineteenth Century as Related to Fire. Ecology, 35, 21–25, https://doi.org/10.2307/1931399, 1954.
Stock, W. D., Bourke, L., and Froend, R. H: Dendroecological indicators of historical responses of pines to water and nutrient availability on a superficial aquifer in south- western Australia, Forest Ecol. Manag., 264, 108–114, https://doi.org/10.1016/j.foreco.2011.09.033. 2012.
Tappeiner, J. C. and Alm, A. A.: Undergrowth vegetation effects on the nutrient content of litterfall and soils in red pine and birch stands in northern Minnesota, Ecology, 56, 1193–1200, https://doi.org/10.2307/1936159, 1975.
Vitousek, P. M., Mooney, H. A., Lubchneco, J., and Melillo, J. M.: Human Domination of Earth's Ecosystems, Science, 277, 494–499, https://doi.org/10.1126/science.277.5325.494, 1997.
Wang, Q., Zhong, M., and Wang, S.: A meta-analysis on the response of microbial biomass, dissolved organic matter, respiration, and N mineralization in mineral soil to fire in forest ecosystems, Forest Ecol. Manag., 271, 91–97, https://doi.org/10.3389/fmicb.2013.00163, 2012.
Webb, S. L.: Contrasting windstorm consequences in two forests, Itasca State Park, Minnesota, Ecology, 70, 1167–1180, 1989.
Wolfe, A. P., W. O. Hobbs, H. H. Birks, J. P. Briner, S. U. Holmgren, O. Ingolfsson, S. Kaushal, G. H. Miller, M. Pagani, J. E. Saros, and R. Vinebrooke.: Stratigraphic expressions of the Holocene–Anthropocene transition revealed in sediments from remote lakes, Earth-Sci. Revs., 116, 17–34, https://doi.org/10.2307/1941384, 2013.
Zenner, E. K. and Peck, J. E.: Characterizing structural conditions in mature managed red pine: Spatial dependency of metrics and adequacy of plot site, Forest Ecol. Manag., 255, 3051–3062, https://doi.org/10.1016/j.foreco.2008.09.006, 2009.
Short summary
We used stable nitrogen isotopes from red pine trees to determine the history of nitrogen (N) cycling within the Deming Lake watershed at Itasca State Park. With nearly 250 years of data, results suggest a major decline in N availability in red pine beginning in the early 20th century based on detection of significant breakpoints. We believe this synchronous decline is the result of the fire suppression in the state park, though alternative biological and physical mechanisms cannot be ruled out.
We used stable nitrogen isotopes from red pine trees to determine the history of nitrogen (N)...
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