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<publisher>HAL CCSD</publisher>
<title lang=en>Assimilation exceeds respiration sensitivity to drought : a FLUXNET synthesis</title>
<creator>Schwalm, Christopher R.</creator>
<creator>Williams, Christopher A.</creator>
<creator>Schaefer, Kevin</creator>
<creator>Arneth, Almut</creator>
<creator>Bonal, Damien</creator>
<creator>Buchmann, Nina</creator>
<creator>Chen, Jiquan</creator>
<creator>Law, Beverly E.</creator>
<creator>Lindroth, Anders</creator>
<creator>Luyssaert, Sebastiaan</creator>
<creator>Reichstein, Markus</creator>
<creator>Richardson, Andrew D.</creator>
<contributor>Graduate School of Geography ; Clark University</contributor>
<contributor>Cooperative Institute for Research in Environmental Sciences (CIRES) ; University of Colorado Boulder [Boulder] - National Oceanic and Atmospheric Administration (NOAA)</contributor>
<contributor>Department of Physical Geography and Ecosystems Analysis [Lund] ; Lund University [Lund]</contributor>
<contributor>Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institute of Plant Sciences ; Swiss Federal Institute of Technology in Zürich (ETH Zürich)</contributor>
<contributor>Department of Environmental Sciences ; University of Toledo</contributor>
<contributor>College of Forestry ; Oregon State University (OSU)</contributor>
<contributor>Department of Biology ; University of Antwerp (UA)</contributor>
<contributor>Biogeochemical-Model-Data Integration Group ; Max Planck Institute for Biogeochemistry</contributor>
<contributor>Complex Systems Research Center ; University of New Hampshire (UNH)</contributor>
<source>ISSN: 1354-1013</source>
<source>EISSN: 1365-2486</source>
<source>Global Change Biology</source>
<publisher>Wiley</publisher>
<identifier>hal-01032076</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01032076</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01032076</source>
<source>Global Change Biology, Wiley, 2010, 16 (2), pp.657-670. 〈10.1111/j.1365-2486.2009.01991.x〉</source>
<identifier>DOI : 10.1111/j.1365-2486.2009.01991.x</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2486.2009.01991.x</relation>
<language>en</language>
<subject lang=en>NET ECOSYSTEM EXCHANGE</subject>
<subject lang=en>ENERGY-BALANCE CLOSURE</subject>
<subject lang=en>EUROPE-WIDE REDUCTION</subject>
<subject lang=en>WATER-VAPOR EXCHANGE</subject>
<subject lang=en>CARBON-DIOXIDE</subject>
<subject lang=en>INTERANNUAL VARIABILITY</subject>
<subject lang=en>ENVIRONMENTAL CONTROLS</subject>
<subject lang=en>SPATIAL VARIABILITY</subject>
<subject lang=en>CLIMATE-CHANGE</subject>
<subject lang=en>UNITED-STATES</subject>
<subject lang=en>BIOME</subject>
<subject lang=en>CARBON CYCLING</subject>
<subject lang=en>DROUGHT</subject>
<subject lang=en>EDDY COVARIANCE</subject>
<subject lang=en>EVAPORATIVE FRACTION</subject>
<subject lang=en>FLUXNET</subject>
<subject lang=en>SYNTHESIS</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The intensification of the hydrological cycle, with an observed and modeled increase in drought incidence and severity, underscores the need to quantify drought effects on carbon cycling and the terrestrial sink. FLUXNET, a global network of eddy covariance towers, provides dense data streams of meteorological data, and through flux partitioning and gap filling algorithms, estimates of net ecosystem productivity (FNEP), gross ecosystem productivity (P), and ecosystem respiration (R). We analyzed the functional relationship of these three carbon fluxes relative to evaporative fraction (EF), an index of drought and site water status, using monthly data records from 238 micrometeorological tower sites distributed globally across 11 biomes. The analysis was based on relative anomalies of both EF and carbon fluxes and focused on drought episodes by biome and climatic season. Globally P was ≈50% more sensitive to a drought event than R. Network-wide drought-induced decreases in carbon flux averaged −16.6 and −9.3 g C m−2 month−1 for P and R, i.e., drought events induced a net decline in the terrestrial sink. However, in evergreen forests and wetlands drought was coincident with an increase in P or R during parts of the growing season. The most robust relationships between carbon flux and EF occurred during climatic spring for FNEP and in climatic summer for P and R. Upscaling flux sensitivities to a global map showed that spatial patterns for all three carbon fluxes were linked to the distribution of croplands. Agricultural areas exhibited the highest sensitivity whereas the tropical region had minimal sensitivity to drought. Combining gridded flux sensitivities with their uncertainties and the spatial grid of FLUXNET revealed that a more robust quantification of carbon flux response to drought requires additional towers in all biomes of Africa and Asia as well as in the cropland, shrubland, savannah, and wetland biomes globally.</description>
<date>2010</date>
</dc>
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