Articles | Volume 12, issue 10
https://doi.org/10.5194/bg-12-2907-2015
© 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-12-2907-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
21 May 2015
Research article |
| 21 May 2015
Assessing vegetation structure and ANPP dynamics in a grassland–shrubland Chihuahuan ecotone using NDVI–rainfall relationships
M. Moreno-de las Heras
CORRESPONDING AUTHOR
Department of Geography, Durham University, Durham DH1 3LE, UK
R. Díaz-Sierra
Mathematical and Fluid Physics Department, Faculty of Sciences, UNED, Madrid 28040, Spain
L. Turnbull
Department of Geography, Durham University, Durham DH1 3LE, UK
J. Wainwright
Department of Geography, Durham University, Durham DH1 3LE, UK
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Technical note: Common ambiguities in plant hydraulics
Consistent responses of vegetation gas exchange to elevated atmospheric CO2 emerge from heuristic and optimization models
Pioneer biocrust communities prevent soil erosion in temperate forests after disturbances
Modelling temporal variability of in situ soil water and vegetation isotopes reveals ecohydrological couplings in a riparian willow plot
Toward estimation of seasonal water dynamics of winter wheat from ground-based L-band radiometry: a concept study
Continuous ground monitoring of vegetation optical depth and water content with GPS signals
Spatially varying relevance of hydrometeorological hazards for vegetation productivity extremes
Temporal dynamics of tree xylem water isotopes: in situ monitoring and modeling
Reviews and syntheses: Gaining insights into evapotranspiration partitioning with novel isotopic monitoring methods
What determines the sign of the evapotranspiration response to afforestation in European summer?
Predicting evapotranspiration from drone-based thermography – a method comparison in a tropical oil palm plantation
Patterns of plant rehydration and growth following pulses of soil moisture availability
Climatic traits on daily clearness and cloudiness indices
Estimates of tree root water uptake from soil moisture profile dynamics
Causes and consequences of pronounced variation in the isotope composition of plant xylem water
Risk of crop failure due to compound dry and hot extremes estimated with nested copulas
Canal blocking optimization in restoration of drained peatlands
Large-scale biospheric drought response intensifies linearly with drought duration in arid regions
Global biosphere–climate interaction: a causal appraisal of observations and models over multiple temporal scales
Examining the evidence for decoupling between photosynthesis and transpiration during heat extremes
Ideas and perspectives: Tracing terrestrial ecosystem water fluxes using hydrogen and oxygen stable isotopes – challenges and opportunities from an interdisciplinary perspective
Does predictability of fluxes vary between FLUXNET sites?
Community-specific hydraulic conductance potential of soil water decomposed for two Alpine grasslands by small-scale lysimetry
Ideas and perspectives: how coupled is the vegetation to the boundary layer?
Crop water stress maps for an entire growing season from visible and thermal UAV imagery
MODIS vegetation products as proxies of photosynthetic potential along a gradient of meteorologically and biologically driven ecosystem productivity
Proximate and ultimate controls on carbon and nutrient dynamics of small agricultural catchments
Transpiration in an oil palm landscape: effects of palm age
Does EO NDVI seasonal metrics capture variations in species composition and biomass due to grazing in semi-arid grassland savannas?
On the use of the post-closure methods uncertainty band to evaluate the performance of land surface models against eddy covariance flux data
Distribution and biophysical processes of beaded streams in Arctic permafrost landscapes
Continental-scale impacts of intra-seasonal rainfall variability on simulated ecosystem responses in Africa
Dew formation on the surface of biological soil crusts in central European sand ecosystems
Nonlinear controls on evapotranspiration in arctic coastal wetlands
Organic carbon efflux from a deciduous forest catchment in Korea
A simple ecohydrological model captures essentials of seasonal leaf dynamics in semi-arid tropical grasslands
Yujie Wang and Christian Frankenberg
Biogeosciences, 19, 4705–4714, https://doi.org/10.5194/bg-19-4705-2022, https://doi.org/10.5194/bg-19-4705-2022, 2022
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Plant hydraulics is often misrepresented in topical research. We highlight the commonly seen ambiguities and/or mistakes, with equations and figures to help visualize the potential biases. We recommend careful thinking when using or modifying existing plant hydraulic terms, methods, and models.
Stefano Manzoni, Simone Fatichi, Xue Feng, Gabriel G. Katul, Danielle Way, and Giulia Vico
Biogeosciences, 19, 4387–4414, https://doi.org/10.5194/bg-19-4387-2022, https://doi.org/10.5194/bg-19-4387-2022, 2022
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Increasing atmospheric carbon dioxide (CO2) causes leaves to close their stomata (through which water evaporates) but also promotes leaf growth. Even if individual leaves save water, how much will be consumed by a whole plant with possibly more leaves? Using different mathematical models, we show that plant stands that are not very dense and can grow more leaves will benefit from higher CO2 by photosynthesizing more while adjusting their stomata to consume similar amounts of water.
Corinna Gall, Martin Nebel, Dietmar Quandt, Thomas Scholten, and Steffen Seitz
Biogeosciences, 19, 3225–3245, https://doi.org/10.5194/bg-19-3225-2022, https://doi.org/10.5194/bg-19-3225-2022, 2022
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Soil erosion is one of the most serious environmental challenges of our time, which also applies to forests when forest soil is disturbed. Biological soil crusts (biocrusts) can play a key role as erosion control. In this study, we combined soil erosion measurements with vegetation surveys in disturbed forest areas. We found that soil erosion was reduced primarily by pioneer bryophyte-dominated biocrusts and that bryophytes contributed more to soil erosion mitigation than vascular plants.
Aaron Smith, Doerthe Tetzlaff, Jessica Landgraf, Maren Dubbert, and Chris Soulsby
Biogeosciences, 19, 2465–2485, https://doi.org/10.5194/bg-19-2465-2022, https://doi.org/10.5194/bg-19-2465-2022, 2022
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This research utilizes high-spatiotemporal-resolution soil and vegetation measurements, including water stable isotopes, within an ecohydrological model to partition water flux dynamics and identify flow paths and durations. Results showed high vegetation water use and high spatiotemporal dynamics of vegetation water source and vegetation isotopes. The evaluation of these dynamics further revealed relatively fast flow paths through both shallow soil and vegetation.
Thomas Jagdhuber, François Jonard, Anke Fluhrer, David Chaparro, Martin J. Baur, Thomas Meyer, and María Piles
Biogeosciences, 19, 2273–2294, https://doi.org/10.5194/bg-19-2273-2022, https://doi.org/10.5194/bg-19-2273-2022, 2022
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This is a concept study of water dynamics across winter wheat starting from ground-based L-band radiometry in combination with on-site measurements of soil and atmosphere. We research the feasibility of estimating water potentials and seasonal flux rates of water (water uptake from soil and transpiration rates into the atmosphere) within the soil-plant-atmosphere system (SPAS) of a winter wheat field. The main finding is that L-band radiometry can be integrated into field-based SPAS assessment.
Vincent Humphrey and Christian Frankenberg
Biogeosciences Discuss., https://doi.org/10.5194/bg-2022-84, https://doi.org/10.5194/bg-2022-84, 2022
Revised manuscript accepted for BG
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Microwave satellites can be used to monitor how vegetation biomass changes over time, or how droughts affect the world's forests. However, such satellite data is still difficult to validate and interpret because of a lack of comparable field observations. Here, we present a remote sensing technique which uses the Global Navigation Satellite Systems (GNSS) as a makeshift radar, making it possible to observe canopy transmissivity at any existing environmental research site in a cost-efficient way.
Josephin Kroll, Jasper M. C. Denissen, Mirco Migliavacca, Wantong Li, Anke Hildebrandt, and Rene Orth
Biogeosciences, 19, 477–489, https://doi.org/10.5194/bg-19-477-2022, https://doi.org/10.5194/bg-19-477-2022, 2022
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Plant growth relies on having access to energy (solar radiation) and water (soil moisture). This energy and water availability is impacted by weather extremes, like heat waves and droughts, which will occur more frequently in response to climate change. In this context, we analysed global satellite data to detect in which regions extreme plant growth is controlled by energy or water. We find that extreme plant growth is associated with temperature- or soil-moisture-related extremes.
Stefan Seeger and Markus Weiler
Biogeosciences, 18, 4603–4627, https://doi.org/10.5194/bg-18-4603-2021, https://doi.org/10.5194/bg-18-4603-2021, 2021
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We developed a setup for fully automated in situ measurements of stable water isotopes in soil and the stems of fully grown trees. We used this setup in a 12-week field campaign to monitor the propagation of a labelling pulse from the soil up to a stem height of 8 m.
We could observe trees shifting their main water uptake depths multiple times, depending on water availability.
The gained knowledge about the temporal dynamics can help to improve water uptake models and future study designs.
Youri Rothfuss, Maria Quade, Nicolas Brüggemann, Alexander Graf, Harry Vereecken, and Maren Dubbert
Biogeosciences, 18, 3701–3732, https://doi.org/10.5194/bg-18-3701-2021, https://doi.org/10.5194/bg-18-3701-2021, 2021
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The partitioning of evapotranspiration into evaporation from soil and transpiration from plants is crucial for a wide range of parties, from farmers to policymakers. In this work, we focus on a particular partitioning method, based on the stable isotopic analysis of water. In particular, we aim at highlighting the challenges that this method is currently facing and, in light of recent methodological developments, propose ways forward for the isotopic-partitioning community.
Marcus Breil, Edouard L. Davin, and Diana Rechid
Biogeosciences, 18, 1499–1510, https://doi.org/10.5194/bg-18-1499-2021, https://doi.org/10.5194/bg-18-1499-2021, 2021
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The physical processes behind varying evapotranspiration rates in forests and grasslands in Europe are investigated in a regional model study with idealized afforestation scenarios. The results show that the evapotranspiration response to afforestation depends on the interplay of two counteracting factors: the transpiration facilitating characteristics of a forest and the reduced saturation deficits of forests caused by an increased surface roughness and associated lower surface temperatures.
Florian Ellsäßer, Christian Stiegler, Alexander Röll, Tania June, Hendrayanto, Alexander Knohl, and Dirk Hölscher
Biogeosciences, 18, 861–872, https://doi.org/10.5194/bg-18-861-2021, https://doi.org/10.5194/bg-18-861-2021, 2021
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Recording land surface temperatures using drones offers new options to predict evapotranspiration based on energy balance models. This study compares predictions from three energy balance models with the eddy covariance method. A model II Deming regression indicates interchangeability for latent heat flux estimates from certain modeling methods and eddy covariance measurements. This complements the available methods for evapotranspiration studies by fine grain and spatially explicit assessments.
Andrew F. Feldman, Daniel J. Short Gianotti, Alexandra G. Konings, Pierre Gentine, and Dara Entekhabi
Biogeosciences, 18, 831–847, https://doi.org/10.5194/bg-18-831-2021, https://doi.org/10.5194/bg-18-831-2021, 2021
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We quantify global plant water uptake durations after rainfall using satellite-based plant water content measurements. In wetter regions, plant water uptake occurs within a day due to rapid coupling between soil and plant water content. Drylands show multi-day plant water uptake after rain pulses, providing widespread evidence for slow rehydration responses and pulse-driven growth responses. Our results suggest that drylands are sensitive to projected shifts in rainfall intensity and frequency.
Estefanía Muñoz and Andrés Ochoa
Biogeosciences, 18, 573–584, https://doi.org/10.5194/bg-18-573-2021, https://doi.org/10.5194/bg-18-573-2021, 2021
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We inspect for climatic traits in the shape of the PDF of the clear-day (c) and the clearness (k) indices at 37 FLUXNET sites for the SW and the PAR spectral bands. We identified three types of PDF, unimodal with low dispersion, unimodal with high dispersion and bimodal, with no difference in the PDF type between c and k at each site. We found that latitude, global climate zone and Köppen climate type have a weak relation and the Holdridge life zone a stronger relation with c and k PDF types.
Conrad Jackisch, Samuel Knoblauch, Theresa Blume, Erwin Zehe, and Sibylle K. Hassler
Biogeosciences, 17, 5787–5808, https://doi.org/10.5194/bg-17-5787-2020, https://doi.org/10.5194/bg-17-5787-2020, 2020
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We developed software to calculate the root water uptake (RWU) of beech tree roots from soil moisture dynamics. We present our approach and compare RWU to measured sap flow in the tree stem. The study relates to two sites that are similar in topography and weather but with contrasting soils. While sap flow is very similar between the two sites, the RWU is different. This suggests that soil characteristics have substantial influence. Our easy-to-implement RWU estimate may help further studies.
Hannes P. T. De Deurwaerder, Marco D. Visser, Matteo Detto, Pascal Boeckx, Félicien Meunier, Kathrin Kuehnhammer, Ruth-Kristina Magh, John D. Marshall, Lixin Wang, Liangju Zhao, and Hans Verbeeck
Biogeosciences, 17, 4853–4870, https://doi.org/10.5194/bg-17-4853-2020, https://doi.org/10.5194/bg-17-4853-2020, 2020
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The depths at which plants take up water is challenging to observe directly. To do so, scientists have relied on measuring the isotopic composition of xylem water as this provides information on the water’s source. Our work shows that this isotopic composition changes throughout the day, which complicates the interpretation of the water’s source and has been currently overlooked. We build a model to help understand the origin of these composition changes and their consequences for science.
Andreia Filipa Silva Ribeiro, Ana Russo, Célia Marina Gouveia, Patrícia Páscoa, and Jakob Zscheischler
Biogeosciences, 17, 4815–4830, https://doi.org/10.5194/bg-17-4815-2020, https://doi.org/10.5194/bg-17-4815-2020, 2020
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This study investigates the impacts of compound dry and hot extremes on crop yields, namely wheat and barley, over two regions in Spain dominated by rainfed agriculture. We provide estimates of the conditional probability of crop loss under compound dry and hot conditions, which could be an important tool for responsible authorities to mitigate the impacts magnified by the interactions between the different hazards.
Iñaki Urzainki, Ari Laurén, Marjo Palviainen, Kersti Haahti, Arif Budiman, Imam Basuki, Michael Netzer, and Hannu Hökkä
Biogeosciences, 17, 4769–4784, https://doi.org/10.5194/bg-17-4769-2020, https://doi.org/10.5194/bg-17-4769-2020, 2020
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Drained peatlands (peat areas where ditches have been excavated to enhance plant production) are one of the main sources of carbon dioxide emissions globally. Blocking these ditches by building dams is a common strategy to restore the self-sustaining peat ecosystem and mitigate carbon dioxide emissions. Where should these dams be located in order to maximize the benefits? Our work tackles this question by making use of the available data, hydrological modeling and numerical optimization methods.
René Orth, Georgia Destouni, Martin Jung, and Markus Reichstein
Biogeosciences, 17, 2647–2656, https://doi.org/10.5194/bg-17-2647-2020, https://doi.org/10.5194/bg-17-2647-2020, 2020
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Drought duration is a key control of the large-scale biospheric drought response.
Thereby, the vegetation responds linearly to drought duration at large spatial scales.
The slope of the linear relationship between the vegetation drought response and drought duration is steeper in drier climates.
Jeroen Claessen, Annalisa Molini, Brecht Martens, Matteo Detto, Matthias Demuzere, and Diego G. Miralles
Biogeosciences, 16, 4851–4874, https://doi.org/10.5194/bg-16-4851-2019, https://doi.org/10.5194/bg-16-4851-2019, 2019
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Bidirectional interactions between vegetation and climate are unraveled over short (monthly) and long (inter-annual) temporal scales. Analyses use a novel causal inference method based on wavelet theory. The performance of climate models at representing these interactions is benchmarked against satellite data. Climate models can reproduce the overall climate controls on vegetation at all temporal scales, while their performance at representing biophysical feedbacks on climate is less adequate.
Martin G. De Kauwe, Belinda E. Medlyn, Andrew J. Pitman, John E. Drake, Anna Ukkola, Anne Griebel, Elise Pendall, Suzanne Prober, and Michael Roderick
Biogeosciences, 16, 903–916, https://doi.org/10.5194/bg-16-903-2019, https://doi.org/10.5194/bg-16-903-2019, 2019
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Recent experimental evidence suggests that during heat extremes, trees may reduce photosynthesis to near zero but increase transpiration. Using eddy covariance data and examining the 3 days leading up to a temperature extreme, we found evidence of reduced photosynthesis and sustained or increased latent heat fluxes at Australian wooded flux sites. However, when focusing on heatwaves, we were unable to disentangle photosynthetic decoupling from the effect of increasing vapour pressure deficit.
Daniele Penna, Luisa Hopp, Francesca Scandellari, Scott T. Allen, Paolo Benettin, Matthias Beyer, Josie Geris, Julian Klaus, John D. Marshall, Luitgard Schwendenmann, Till H. M. Volkmann, Jana von Freyberg, Anam Amin, Natalie Ceperley, Michael Engel, Jay Frentress, Yamuna Giambastiani, Jeff J. McDonnell, Giulia Zuecco, Pilar Llorens, Rolf T. W. Siegwolf, Todd E. Dawson, and James W. Kirchner
Biogeosciences, 15, 6399–6415, https://doi.org/10.5194/bg-15-6399-2018, https://doi.org/10.5194/bg-15-6399-2018, 2018
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Understanding how water flows through ecosystems is needed to provide society and policymakers with the scientific background to manage water resources sustainably. Stable isotopes of hydrogen and oxygen in water are a powerful tool for tracking water fluxes, although the heterogeneity of natural systems and practical methodological issues still limit their full application. Here, we examine the challenges in this research field and highlight new perspectives based on interdisciplinary research.
Ned Haughton, Gab Abramowitz, Martin G. De Kauwe, and Andy J. Pitman
Biogeosciences, 15, 4495–4513, https://doi.org/10.5194/bg-15-4495-2018, https://doi.org/10.5194/bg-15-4495-2018, 2018
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This project explores predictability in energy, water, and carbon fluxes in the free-use Tier 1 of the FLUXNET 2015 dataset using a uniqueness metric based on comparison of locally and globally trained models. While there is broad spread in predictability between sites, we found strikingly few strong patterns. Nevertheless, these results can contribute to the standardisation of site selection for land surface model evaluation and help pinpoint regions that are ripe for further FLUXNET research.
Georg Frenck, Georg Leitinger, Nikolaus Obojes, Magdalena Hofmann, Christian Newesely, Mario Deutschmann, Ulrike Tappeiner, and Erich Tasser
Biogeosciences, 15, 1065–1078, https://doi.org/10.5194/bg-15-1065-2018, https://doi.org/10.5194/bg-15-1065-2018, 2018
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For central Europe in addition to rising temperatures, an increasing variability in precipitation is predicted. In a replicated mesocosm experiment we compared evapotranspiration and the biomass productivity of two differently drought-adapted vegetation communities during two irrigation regimes (with and without drought periods). Significant differences between the different communities were found in the response to variations in the water supply and biomass production.
Martin G. De Kauwe, Belinda E. Medlyn, Jürgen Knauer, and Christopher A. Williams
Biogeosciences, 14, 4435–4453, https://doi.org/10.5194/bg-14-4435-2017, https://doi.org/10.5194/bg-14-4435-2017, 2017
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Understanding the sensitivity of transpiration to stomatal conductance is critical to simulating the water cycle. This sensitivity is a function of the degree of coupling between the vegetation and the atmosphere. We combined an extensive literature summary with estimates of coupling derived from FLUXNET data. We found notable departures from the values previously reported. These data form a model benchmarking metric to test existing coupling assumptions.
Helene Hoffmann, Rasmus Jensen, Anton Thomsen, Hector Nieto, Jesper Rasmussen, and Thomas Friborg
Biogeosciences, 13, 6545–6563, https://doi.org/10.5194/bg-13-6545-2016, https://doi.org/10.5194/bg-13-6545-2016, 2016
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This study investigates whether the UAV (drone) based WDI can determine crop water stress from fields with open canopies (land surface consisting of both soil and canopy) and from fields where canopies are starting to senesce. This utility could solve issues that arise when applying the commonly used CWSI stress index. The WDI succeeded in providing accurate, high-resolution estimates of crop water stress at different growth stages of barley.
Natalia Restrepo-Coupe, Alfredo Huete, Kevin Davies, James Cleverly, Jason Beringer, Derek Eamus, Eva van Gorsel, Lindsay B. Hutley, and Wayne S. Meyer
Biogeosciences, 13, 5587–5608, https://doi.org/10.5194/bg-13-5587-2016, https://doi.org/10.5194/bg-13-5587-2016, 2016
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We re-evaluated the connection between satellite greenness products and C-flux tower data in four Australian ecosystems. We identify key mechanisms driving the carbon cycle, and provide an ecological basis for the interpretation of vegetation indices. We found relationships between productivity and greenness to be non-significant in meteorologically driven evergreen forests and sites where climate and vegetation phenology were asynchronous, and highly correlated in phenology-driven ecosystems.
Zahra Thomas, Benjamin W. Abbott, Olivier Troccaz, Jacques Baudry, and Gilles Pinay
Biogeosciences, 13, 1863–1875, https://doi.org/10.5194/bg-13-1863-2016, https://doi.org/10.5194/bg-13-1863-2016, 2016
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Direct human impact on a catchment (fertilizer input, soil disturbance, urbanization) is asymmetrically linked with inherent catchment properties (geology, soil, topography), which together determine catchment vulnerability to human activity. To quantify the influence of physical, hydrologic, and anthropogenic controls on surface water quality, we used a 5-year high-frequency water chemistry data set from three contrasting headwater catchments in western France.
A. Röll, F. Niu, A. Meijide, A. Hardanto, Hendrayanto, A. Knohl, and D. Hölscher
Biogeosciences, 12, 5619–5633, https://doi.org/10.5194/bg-12-5619-2015, https://doi.org/10.5194/bg-12-5619-2015, 2015
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The study provides first insight into eco-hydrological consequences of the continuing oil palm expansion in the tropics. Stand transpiration rates of some studied oil palm stands compared to or even exceeded values reported for tropical forests, indicating high water use of oil palms under certain conditions. Oil palm landscapes show some spatial variations in (evapo)transpiration rates, e.g. due to varying plantation age, but the day-to-day variability of oil palm transpiration is rather low.
J. L. Olsen, S. Miehe, P. Ceccato, and R. Fensholt
Biogeosciences, 12, 4407–4419, https://doi.org/10.5194/bg-12-4407-2015, https://doi.org/10.5194/bg-12-4407-2015, 2015
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Limitations of satellite-based normalized difference vegetation index (NDVI) for monitoring vegetation trends are investigated using observations from the Widou Thiengoly test site in northern Senegal. NDVI do not reflect the large differences found in biomass production and species composition between grazed and ungrazed plots. This is problematic for vegetation trend analysis in the context of drastically increasing numbers of Sahelian livestock in recent decades.
J. Ingwersen, K. Imukova, P. Högy, and T. Streck
Biogeosciences, 12, 2311–2326, https://doi.org/10.5194/bg-12-2311-2015, https://doi.org/10.5194/bg-12-2311-2015, 2015
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The energy balance of eddy covariance (EC) flux data is normally not closed. Therefore, EC flux data are usually post-closed, i.e. the measured turbulent fluxes are adjusted so as to close the energy balance. We propose to use in model evaluation the post-closure method uncertainty band (PUB) to account for the uncertainty in EC data originating from lacking energy balance closure. Working with only a single post-closing method might result in severe misinterpretations in model-data comparison.
C. D. Arp, M. S. Whitman, B. M. Jones, G. Grosse, B. V. Gaglioti, and K. C. Heim
Biogeosciences, 12, 29–47, https://doi.org/10.5194/bg-12-29-2015, https://doi.org/10.5194/bg-12-29-2015, 2015
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Beaded streams have deep elliptical pools connected by narrow runs that we show are common landforms in the continuous permafrost zone. These fluvial systems often initiate from lakes and occur predictably in headwater portions of moderately sloping watersheds. Snow capture along stream courses reduces ice thickness allowing thawed sediment to persist under most pools. Interpool thermal variability and hydrologic regimes provide important aquatic habitat and connectivity in Arctic landscapes.
K. Guan, S. P. Good, K. K. Caylor, H. Sato, E. F. Wood, and H. Li
Biogeosciences, 11, 6939–6954, https://doi.org/10.5194/bg-11-6939-2014, https://doi.org/10.5194/bg-11-6939-2014, 2014
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Climate change is expected to modify the way that rainfall arrives, namely the frequency and intensity of rainfall events and rainy season length. Yet, the quantification of the impact of these possible rainfall changes across large biomes is lacking. Our study fills this gap by developing a new modeling framework, applying it to continental Africa. We show that African ecosystems are highly sensitive to these rainfall variabilities, with esp. large sensitivity to changes in rainy season length.
T. Fischer, M. Veste, O. Bens, and R. F. Hüttl
Biogeosciences, 9, 4621–4628, https://doi.org/10.5194/bg-9-4621-2012, https://doi.org/10.5194/bg-9-4621-2012, 2012
A. K. Liljedahl, L. D. Hinzman, Y. Harazono, D. Zona, C. E. Tweedie, R. D. Hollister, R. Engstrom, and W. C. Oechel
Biogeosciences, 8, 3375–3389, https://doi.org/10.5194/bg-8-3375-2011, https://doi.org/10.5194/bg-8-3375-2011, 2011
S. J. Kim, J. Kim, and K. Kim
Biogeosciences, 7, 1323–1334, https://doi.org/10.5194/bg-7-1323-2010, https://doi.org/10.5194/bg-7-1323-2010, 2010
P. Choler, W. Sea, P. Briggs, M. Raupach, and R. Leuning
Biogeosciences, 7, 907–920, https://doi.org/10.5194/bg-7-907-2010, https://doi.org/10.5194/bg-7-907-2010, 2010
Cited articles
Al-Bakri, J. T. and Suleiman, A. S.: NDVI response to rainfall in different ecological zones in Jordan, Int. J. Remote Sens., 10, 3897–3912, 2004.
Allen, A. P., Pockman, W. T., Restrepo, C., and Milne, B. T.: Allometry, growth and population regulation of the desert shrub Larrea tridentata, Funct. Ecol., 22, 197–204, 2008.
Anderson, G. L., Hanson, J. D., and Haas., R. H.: Evaluating Landsat Thematic Mapper derived vegetation indices for estimating above-ground biomass on semiarid rangelands, Remote Sens. Environ., 45, 165–175, 1993.
Baez, S., Collins, S. C., Pockman, W. T., Johnson, J. E., and Small, E. E.: Effects of experimental rainfall manipulations on Chihuahuan Desert grassland and shrubland plant communities, Oecologia, 172, 1117–1127, 2013.
Brown, J. H., Valone, T. J., and Curtin, C. G.: Reorganization of an arid ecosystem in response to recent climate change, P. Natl. Acad. Sci. USA., 94, 9729–9733, 1997.
Buffington, L. C. and Herbel, C. H.: Vegetational changes on a semidesert grassland range from 1858 to 1963, Ecol. Monogr., 35, 139–164, 1965.
Carlson, T. N. and Ripley, D. A.: On the relation between NDVI, fractional cover, and leaf area index, Remote Sens. Environ., 62, 241–252, 1997.
Choler, P., Sea, W., Briggs, P., Raupach, M., and Leuning, R.: A simple ecohydrological model captures essentials of seasonal leaf dynamics in semi-arid tropical grasslands, Biogeosciences, 7, 907–920, https://doi.org/10.5194/bg-7-907-2010, 2010.
Christensen, J. H. and Konikicharla, K. K.: Climate phenomena and their relevance for future regional climate change, in: Climate Change 2013: The Physical Science Basis, Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, edited by: Stoker, T. F., Qin, D., Platter, G. K., Tignor, M., Allen, S. K., Boschung, J., Navels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge University Press, Cambridge, UK, 1217–1308, 2013.
Collins, S. L., Belnap, J., Grimm, N. B., Rudgers, J. A., Dahm, C. N., D'Odorico, P., Litvak, M., Natvig, D. O., Peters, D. C., Pockman, W. T., Sinsabaugh, R. L., and Wolf, B. O.: A multiple, hierarchical model of pulse dynamics in arid-land ecosystems, Annu. Rev. Ecol. Evol. Syst., 45, 397–419, 2014.
Dahm, C. N. and Moore, D. I.: The El Niño/Southern Oscillation phenomenon and the Sevilleta Long-Term Ecological Research site, in: El Niño and Long-Term Ecological Research (LTER) Sites, edited by: Greenland, D., LTER Network Office, University of Washington, Seattle, USA, 12–20, 1994.
DeFries, R. S., Hansen, M. C., and Townshend, J. R.G.: Global continuous fields of vegetation characteristics: a linear mixture model applied to multiyear 8 km AVHRR data, Int. J. Remote Sens., 21, 1389–1414, 2000.
D'Odorico, P., Okin, G. S., and Bestelmeyer, B. T.: A synthetic review of feedbacks and drivers of shrub encroachment in arid grasslands, Ecohydrology, 5, 520–530, 2012.
Evans, J. and Geerken, R.: Discrimination between climate and human-induced dryland degradation, J. Arid Environ., 57, 535–554, 2004.
Fisher, F. M., Zak, J. C., Cunningham, G. L., and Whitford, W. G.: Water and nitrogen effects on growth and allocation patterns of creosotebush in the northern Chihuahuan Desert, J. Range Manage., 41, 387–391, 1988.
Forzieri, G., Castelli, F., and Vivoni, E. R.: Vegetation dynamics within the North American Monsoon Region, J. Climate, 24, 1763–1783, 2011.
Gao, Q. and Reynolds, J. F.: Historical shrub-grass transitions in the northern Chihuahuan Desert: Modeling the effects of shifting rainfall seasonlity and event size over a landscape, Glob. Change Biol., 9, 1–19, 2003.
Garcia, M., Litago, J., Palacios-Orueta, A., Pinzon, J. E., and Ustin, S. L.: Short-term propagation of rainfall peturbations on terrestrial ecosystems in central California, Appl. Veg. Sci., 13, 146–162, 2010.
Gibbens, R. P. and Lenz, J. M.: Root systems of some Chihuahuan Desert plants, J. Arid Environ., 49, 221–263, 2001.
Gilad, E., Shachak, M., and Meron, E.: Dynamics and spatial organization of plant communities in water-limited systems, Theor. Popul. Biol., 72, 214–230, 2007.
Girden, E. R.: ANOVA: repeated measures, SAGE University Paper Series 7-84, SAGE Publications, Newbury Park, USA, 1992.
Godin-Alvarez, H., Herrick, J. E., Mattocks, M., Toledo, D., and Van Zee, J.: Comparison of three vegetation monitoring methods: their relative utility for ecological assessment and monitoring, Ecol. Indic., 9, 1001–1008, 2009.
Gosz, J. R.: Ecological functions in a biome transition zone: translating local responses to broad-scale dynamics, in: Landscape Boundaries: Consequences for Biotic Diversity and Ecological Flows, edited by: Hansen, A. J., and di Castri, A. J., Springer, New York, USA, 56–75, 1992.
Hansen, M. C., DeFries, R. S., Townshend, J. R. G., Sohlberg, R., Dimiceli, C., and Carroll, M.: Towards an operational MODIS continuous field of percent tree cover algorithm: examples using AVHRR and MODIS data, Remote Sens. Environ., 83, 303–319, 2002.
Holm, A. McR., Cridland, S. W., and Roderick, M. L.: The use of time-integrated NOAA NDVI data and rainfall to assess landscape degradation in the arid and shrubland of Western Australia, Remote Sens. Environ., 85, 145–158, 2003.
Huenneke, L. F., Anderson, J. P., Remmenga, M., and Schlesinger, W. H.: Desertification alters patterns of aboveground net primary production in Chihuahuan ecosystems, Glob. Change Biol., 8, 247–264, 2002.
Huete, A., Jackson, R. D., and Post, D. F.: Spectral response of a plant canopy with different soil backgrounds, Remote Sens. Environ., 17, 37–53, 1985.
Huete, A., Didan, K., Miura, T., Rodriguez, E. P., Gao, X., and Ferreira, L. G.: Overview of the radiometric and biophysical performance of the MODIS vegetation indices, Remote Sens. Environ., 83, 195–213, 2002.
Knapp, A. K., Briggs, J. M., Collins, S. L., Archer, S. R., Bret-Harte, M. S., Ewers, B. E., Peters, D. P., Young, D. R., Shaver, G. R., Pendall, E., and Cleary, M. B.: Shrub encroachment in North American grasslands: shifts in growth form dominance rapidly alters control of ecosystem carbon inputs, Glob. Change Biol., 14, 615–623, 2008.
Lu, H., Raupach, M. R., McVicar, T. R., and Barret, D. J.: Decomposition of vegetation cover into woody and herbaceous components using AVHRR NDVI time series, Remote Sens. Environ., 86, 1–16, 2003.
Millennium Ecosystem Assessment: Ecosystems and Human Well-being: Biodiversity Synthesis, World Resources Institute, Washington, DC, USA, 2005.
Montandon, L. M. and Small, E. E.: The impact of soil reflectance on the quantification of the green vegetation fraction from NDVI, Remote Sens. Environ., 112, 1835–1845, 2008.
Moreno-de las Heras, M., Saco, P. M., Willgoose, G. R., and Tongway, D. J.: Variations in hydrological connectivity of Australian semiarid landscapes indicate abrupt changes in rainfall-use efficiency of vegetation, J. Geophys. Res., 117, G03009, https://doi.org/10.1029/2011JG001839, 2012.
Mueller E. N., Wainwright, J., and Parsons, A. J.: The stability of vegetation boundaries and the propagation of desertification in the American Southwest: A modelling approach, Ecol. Model., 208, 91–101, 2007.
Muldavin, E. H., Moore, D. I., Collins, S. L., Wetherill, K. R., and Lightfoot, D. C.: Aboveground net primary production dynamics in a northern Chihuahuan Desert ecosystem, Oecologia, 155, 123–132, 2008.
Munkhtsetseg, E., Kimura, R., Wand, J., and Shinoda, M.: Pasture yield response to precipitation and high temperature in Mongolia, J. Arid Environ., 70, 1552–1563, 2007.
Notaro, M., Liu, Z., Gallimore, R. G., Williams, J. W., Gutzler, D. S., and Collins, S.: Complex seasonal cycle of ecohydrology in the Southwest United States, J. Geophys. Res., 115, G04034, https://doi.org/10.1029/2010JG001382, 2010.
Ogle, K. and Reynolds, J. F.: Plant responses to precipitation in desert ecosystems: integrating functional types, pulses, thresholds and delays, Oecologia, 141, 282–294, 2004.
Okin, G. S. and Roberts, D. A.: Remote sensing in arid environments: challenges and opportunities, in: Manual of Remote Sensing Vol 4: Remote Sensing for Natural Resource Management and Environmental Monitoring, edited by: Ustin, S., John Willey and Sons, New York, USA, 111–146, 2004.
Okin, G. S., Roberts, D. A., Murray, B., and Okin, W. J.: Practical limits on hyperspectral vegetation discrimination in arid and semiarid environments, Remote Sens. Environ., 77, 212–225, 2001.
Okin, G. S., Parsons, A. J., Wainwright, J., Herrick, J. E., Bestelmeyer, B. T., Peters, D. C., and Fredrickson, E. L.: Do changes in connectivity explain desertification?, BioScience, 59, 237–244, 2009.
Pennington, D. D. and Collins, S. L.: Response of an aridland ecosystem to interannual climate variability and prolonged drought, Landscape Ecol., 22, 897–910, 2007.
Peters, A. J. and Eve, M. D.: Satellite monitoring of desert plant community response to moisture availability, Environ. Monit. Assess., 37, 273–287, 1995.
Peters, A. J., Eve, M. D., Holt, E. H., and Whitford, W. G.: Analysis of desert plant community growth patterns with high temporal resolution satellite spectra, J. Appl. Ecol., 34, 418–432, 1997.
Peters, D. P. C.: Plant species dominance at a grassland-shrubland ecotone: and individual-based gap dynamics model of herbaceous and woody species, Ecol. Model., 152, 5–32, 2002.
Petrie, M. D., Collins, S. L., Gutzler, D. S., and Moore, D. M.: Regional trends and local variability in monsoon precipitation in the northern Chihuahuan desert, USA, J. Arid Environ., 103, 63–70, 2014.
Pockman, W. T. and Small, E. E.: The influence of spatial patterns of soil moisture on the grass and shrub responses to a summer rainstorm in a Chihuahuan desert ecotone, Ecosystems, 13, 511–525, 2010.
Polley, H. W., Johnson, H. B., and Tischler, C. R.: Woody invasion of grasslands: evidence that CO2 enrichment indirectly promotes establishment of Prosopis glandulosa, Plant Ecol., 164, 85–94, 2002.
Prasad, V. K., Badarinath, K. V. S., and Eaturu, A.: Spatial patterns of vegetation phenology metrics and related climatic controls of eight contrasting forest types in India-analysis from remote sensing datasets, Theor. Appl. Climatol., 89, 95–107, 2007.
Ravi, S, Breshears, D. D., Huxman, T. E., and D'Odorico, P.: Land degradation in drylands: Interactions among hydrologic-aeolian processes and vegetation dynamics, Geomorphology, 116, 236–245, 2010.
Reynolds, J. F., Virginia, R. A., Kemp, P. R., de Soyza, A. G., and Tremmel, D. C.: Impact of drought on desert shrubs: effects of seasonality and degree of resource island development, Ecol. Monogr., 69, 69–106, 1999.
Reynolds, J. F., Kemp, P. R., Ogle, K., and Fernandez, R. J.: Modifying the "pulse-reserve" paradigm for deserts of North America: precipitation pulses, soil water, and plant responses, Oecologia, 141, 194–210, 2004.
Rietkerk, M., Boerlijst, M. C., Van Langevelde, F., HilleRisLambers, R., Van de Koppel, J., Kumar, L., Prins, H. H. T., and de Roos, A. M.: Self-organization of vegetation in arid ecosystems, Am. Nat., 160, 524–530, 2002.
Roderick, M. L., Noble, I. R., and Cridland, S. W.: Estimating woody and herbaceous cover from time series satellite observations, Global Ecol. Biogeogr., 8, 501–508, 1999.
Saco, P. M. and Moreno-de las Heras, M.: Ecogeomorphic coevolution of semiarid hillslopes: emergence of banded and striped vegetation patterns through interaction of biotic and abiotic processes, Water Resour. Res., 49, 115–126, 2013.
Schlesinger, W. H., Reynolds, J. F., Cunningham, G. L., Huenneke, L. F., Jarrell, W. M., Virginia, R. A., and Whitford, W. G.: Biological feedbacks in global desertification, Science, 247, 1043–1048, 1990.
Schwinning, S. and Sala, O.E.: Hierarchy of responses to resource pulses in arid and semi-arid ecosystems, Oecologia, 141, 211–220, 2004.
Smith, M. O., Ustin, S. L., Adams, J. B., and Gillespie, A. R.: Vegetation in deserts: I. a regional measure of abundance from multispectral images, Remote Sens. Environ., 31, 1–26, 1990.
Snyder, K. A. and Tartowsky, S. L.: Multi-scale temporal variation in water availability: Implications for vegetation dynamics in arid and semi-arid ecosystems, J. Arid Environ., 65, 219–234, 2006.
Soil Survey Staff: Keys to Soil Taxonomy, 11th Ed., USDA Natural Resources Conservation Service, Washington, USA, 2010.
Somers, B., Asner, G. P., Tits, L., and Coppin, P.: Endmember variability in Spectral Mixture Analysis: A review, Remote Sens. Environ., 115, 1603–1616, 2011.
Sparrow, A. D., Friedel, M. H., and Stafford-Smith, D. M.: A landscape-scale model of shrub and herbage dynamics in Central Australia, validated by satellite data, Ecol. Model., 97, 197–213, 1997.
Stewart, J., Parsons, A. J., Wainwright, J., Okin, G. S., Bestelmeyer, B. T., Fredrickson, E. L., and Schlesinger, W. H.: Modelling emergent patterns of dynamic desert ecosystems, Ecol. Monogr., 84, 373–410, 2014.
Throop, H. L., Reichman, L. G., and Archer, S. R.: Response of dominant grass and shrub species to water manipulation: an ecophysiological basis for shrub invasion in a Chihuahuan Desert grassland, Oecologia, 169, 373–383, 2012.
Turnbull, L., Brazier, R. E., Wainwright, J., Dixon, L., and Bol, R.: Use of carbon isotope analysis to understand semi-arid erosion dynamics and long-term semi-arid degradation, Rapid Commun. Mass Sp., 22, 1697–1702, 2008.
Turnbull, L., Wainwright, J., and Brazier, R. E.: Changes in hydrology and erosion over a transition from grassland to shrubland, Hydrol. Process., 24, 393–414, 2010a.
Turnbull, L., Wainwright, J., Brazier, R. E., and Bol, R.: Biotic and abiotic changes in ecosystem structure over a shrub-encroachment gradient in the southwestern USA, Ecosystems, 13, 1239–1255, 2010b.
Turnbull, L., Wilcox, B. P. , Belnap, J., Ravi, S., D'Odorico, P., Childers, D. L., Gwenzi, W., Okin, G. S., Wainwright, J., Caylor, K. K., and Sankey T.: Understanding the role of ecohydrological feedbacks in ecosystem state change in drylands, Ecohydrology, 5, 174–183, 2012.
Turnbull, L., Wainwright, J., and Ravi, S.: Vegetation change in the southwestern USA: patterns and processes, in: Patterns of Land Degradation in Drylands, Understanding Self-Organised Ecogeomorphic Systems, edited by: Mueller, E. N., Wainwright, J., Parsons, A. J., and Turnbull, L., Springer, New York, USA, 289–313, 2014.
Turnbull, L., Parsons, A. J., Wainwright, J., and Anderson, J. P.: Runoff responses to long-term rainfall variability in a shrub-dominated catchment, J. Arid Environ., 91, 88–94, 2013.
van Auken, O. W.: Shrub invasions of North American semiarid grasslands, Annu. Rev. Ecol. Syst., 12, 352–356, 2000.
Veron, S. R. and Paruelo, V.: Desertification alters the response of vegetation to changes in precipitation, J. App. Ecol., 47, 1233–1241, 2010.
Wainwright, J.: Climate and climatological variations in the Jornada Range and neighboring areas of the US South West, Adv. Environ. Monitor. Modell., 1, 39–110, 2005.
Wainwright, J., Parsons, A. J., and Abrahams, A. D.: Plot-scale studies of vegetation, overland flow and erosion interactions: case studies from Arizona and New Mexico, Hydrol. Process., 14, 2921–2943, 2000.
Webb, R. H., Turner, R. M., Bowers, J. E., and Hastings, J. R.: The Changing Mile Revisited. An Ecological Study of Vegetation Change with Time in the Lower Mile of an Arid and Semiarid Region, University of Arizona, Tucson, USA, 2003.
Weiss, J. L., Gutzler, D. S., Coonrod, J. E. A., and Dahm, C. N.: Long-term vegetation monitoring with NDVI in a diverse semi-arid setting, central New Mexico, USA, J. Arid Environ., 58, 249–272, 2004.
Short summary
Exploration of NDVI-rainfall relationships provided ready biophysically based criteria to study the spatial distribution and dynamics of ANPP for herbaceous and shrub vegetation across a grassland-shrubland Chihuahuan ecotone (Sevilleta NWR, New Mexico). Overall our results suggest that shrub encroachment has not been particularly active for 2000-2013 in the area, although future reductions in summer precipitation and/or increases in winter rainfall may intensify the shrub-encroachment process.
Exploration of NDVI-rainfall relationships provided ready biophysically based criteria to study...
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