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Gross primary production responses to warming, elevated CO2 , and irrigation: quantifying the drivers of ecosystem physiology in a semiarid grassland.

Identifieur interne : 000B28 ( PubMed/Checkpoint ); précédent : 000B27; suivant : 000B29

Gross primary production responses to warming, elevated CO2 , and irrigation: quantifying the drivers of ecosystem physiology in a semiarid grassland.

Auteurs : Edmund M. Ryan [Royaume-Uni] ; Kiona Ogle [États-Unis] ; Drew Peltier [États-Unis] ; Anthony P. Walker [États-Unis] ; Martin G. De Kauwe [Australie] ; Belinda E. Medlyn [Australie] ; David G. Williams [États-Unis] ; William Parton [États-Unis] ; Shinichi Asao [États-Unis] ; Bertrand Guenet [France] ; Anna B. Harper [Royaume-Uni] ; Xingjie Lu [Australie] ; Kristina A. Luus [Allemagne] ; Sönke Zaehle [Allemagne] ; Shijie Shu [États-Unis] ; Christian Werner [Allemagne] ; Jianyang Xia [États-Unis] ; Elise Pendall [Australie]

Source :

RBID : pubmed:27992952

Descripteurs français

English descriptors

Abstract

Determining whether the terrestrial biosphere will be a source or sink of carbon (C) under a future climate of elevated CO2 (eCO2 ) and warming requires accurate quantification of gross primary production (GPP), the largest flux of C in the global C cycle. We evaluated 6 years (2007-2012) of flux-derived GPP data from the Prairie Heating and CO2 Enrichment (PHACE) experiment, situated in a grassland in Wyoming, USA. The GPP data were used to calibrate a light response model whose basic formulation has been successfully used in a variety of ecosystems. The model was extended by modeling maximum photosynthetic rate (Amax ) and light-use efficiency (Q) as functions of soil water, air temperature, vapor pressure deficit, vegetation greenness, and nitrogen at current and antecedent (past) timescales. The model fits the observed GPP well (R(2)  = 0.79), which was confirmed by other model performance checks that compared different variants of the model (e.g. with and without antecedent effects). Stimulation of cumulative 6-year GPP by warming (29%, P = 0.02) and eCO2 (26%, P = 0.07) was primarily driven by enhanced C uptake during spring (129%, P = 0.001) and fall (124%, P = 0.001), respectively, which was consistent across years. Antecedent air temperature (Tairant ) and vapor pressure deficit (VPDant ) effects on Amax (over the past 3-4 days and 1-3 days, respectively) were the most significant predictors of temporal variability in GPP among most treatments. The importance of VPDant suggests that atmospheric drought is important for predicting GPP under current and future climate; we highlight the need for experimental studies to identify the mechanisms underlying such antecedent effects. Finally, posterior estimates of cumulative GPP under control and eCO2 treatments were tested as a benchmark against 12 terrestrial biosphere models (TBMs). The narrow uncertainties of these data-driven GPP estimates suggest that they could be useful semi-independent data streams for validating TBMs.

DOI: 10.1111/gcb.13602
PubMed: 27992952


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pubmed:27992952

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<name sortKey="Werner, Christian" sort="Werner, Christian" uniqKey="Werner C" first="Christian" last="Werner">Christian Werner</name>
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<name sortKey="Xia, Jianyang" sort="Xia, Jianyang" uniqKey="Xia J" first="Jianyang" last="Xia">Jianyang Xia</name>
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<name sortKey="Pendall, Elise" sort="Pendall, Elise" uniqKey="Pendall E" first="Elise" last="Pendall">Elise Pendall</name>
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<name sortKey="Peltier, Drew" sort="Peltier, Drew" uniqKey="Peltier D" first="Drew" last="Peltier">Drew Peltier</name>
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<name sortKey="Walker, Anthony P" sort="Walker, Anthony P" uniqKey="Walker A" first="Anthony P" last="Walker">Anthony P. Walker</name>
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<name sortKey="Asao, Shinichi" sort="Asao, Shinichi" uniqKey="Asao S" first="Shinichi" last="Asao">Shinichi Asao</name>
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<name sortKey="Lu, Xingjie" sort="Lu, Xingjie" uniqKey="Lu X" first="Xingjie" last="Lu">Xingjie Lu</name>
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<name sortKey="Luus, Kristina A" sort="Luus, Kristina A" uniqKey="Luus K" first="Kristina A" last="Luus">Kristina A. Luus</name>
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<name sortKey="Zaehle, Sonke" sort="Zaehle, Sonke" uniqKey="Zaehle S" first="Sönke" last="Zaehle">Sönke Zaehle</name>
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<name sortKey="Shu, Shijie" sort="Shu, Shijie" uniqKey="Shu S" first="Shijie" last="Shu">Shijie Shu</name>
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<name sortKey="Werner, Christian" sort="Werner, Christian" uniqKey="Werner C" first="Christian" last="Werner">Christian Werner</name>
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<nlm:affiliation>Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt, Germany.</nlm:affiliation>
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<wicri:regionArea>Senckenberg Biodiversity and Climate Research Centre (BiK-F), Senckenberganlage 25, 60325, Frankfurt</wicri:regionArea>
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<term>Grassland</term>
<term>Wyoming</term>
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<term>Climat</term>
<term>Cycle du carbone</term>
<term>Dioxyde de carbone</term>
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<term>Wyoming</term>
<term>Écosystème</term>
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<div type="abstract" xml:lang="en">Determining whether the terrestrial biosphere will be a source or sink of carbon (C) under a future climate of elevated CO2 (eCO2 ) and warming requires accurate quantification of gross primary production (GPP), the largest flux of C in the global C cycle. We evaluated 6 years (2007-2012) of flux-derived GPP data from the Prairie Heating and CO2 Enrichment (PHACE) experiment, situated in a grassland in Wyoming, USA. The GPP data were used to calibrate a light response model whose basic formulation has been successfully used in a variety of ecosystems. The model was extended by modeling maximum photosynthetic rate (Amax ) and light-use efficiency (Q) as functions of soil water, air temperature, vapor pressure deficit, vegetation greenness, and nitrogen at current and antecedent (past) timescales. The model fits the observed GPP well (R(2)  = 0.79), which was confirmed by other model performance checks that compared different variants of the model (e.g. with and without antecedent effects). Stimulation of cumulative 6-year GPP by warming (29%, P = 0.02) and eCO2 (26%, P = 0.07) was primarily driven by enhanced C uptake during spring (129%, P = 0.001) and fall (124%, P = 0.001), respectively, which was consistent across years. Antecedent air temperature (Tairant ) and vapor pressure deficit (VPDant ) effects on Amax (over the past 3-4 days and 1-3 days, respectively) were the most significant predictors of temporal variability in GPP among most treatments. The importance of VPDant suggests that atmospheric drought is important for predicting GPP under current and future climate; we highlight the need for experimental studies to identify the mechanisms underlying such antecedent effects. Finally, posterior estimates of cumulative GPP under control and eCO2 treatments were tested as a benchmark against 12 terrestrial biosphere models (TBMs). The narrow uncertainties of these data-driven GPP estimates suggest that they could be useful semi-independent data streams for validating TBMs.</div>
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<AbstractText>Determining whether the terrestrial biosphere will be a source or sink of carbon (C) under a future climate of elevated CO2 (eCO2 ) and warming requires accurate quantification of gross primary production (GPP), the largest flux of C in the global C cycle. We evaluated 6 years (2007-2012) of flux-derived GPP data from the Prairie Heating and CO2 Enrichment (PHACE) experiment, situated in a grassland in Wyoming, USA. The GPP data were used to calibrate a light response model whose basic formulation has been successfully used in a variety of ecosystems. The model was extended by modeling maximum photosynthetic rate (Amax ) and light-use efficiency (Q) as functions of soil water, air temperature, vapor pressure deficit, vegetation greenness, and nitrogen at current and antecedent (past) timescales. The model fits the observed GPP well (R(2)  = 0.79), which was confirmed by other model performance checks that compared different variants of the model (e.g. with and without antecedent effects). Stimulation of cumulative 6-year GPP by warming (29%, P = 0.02) and eCO2 (26%, P = 0.07) was primarily driven by enhanced C uptake during spring (129%, P = 0.001) and fall (124%, P = 0.001), respectively, which was consistent across years. Antecedent air temperature (Tairant ) and vapor pressure deficit (VPDant ) effects on Amax (over the past 3-4 days and 1-3 days, respectively) were the most significant predictors of temporal variability in GPP among most treatments. The importance of VPDant suggests that atmospheric drought is important for predicting GPP under current and future climate; we highlight the need for experimental studies to identify the mechanisms underlying such antecedent effects. Finally, posterior estimates of cumulative GPP under control and eCO2 treatments were tested as a benchmark against 12 terrestrial biosphere models (TBMs). The narrow uncertainties of these data-driven GPP estimates suggest that they could be useful semi-independent data streams for validating TBMs.</AbstractText>
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<AffiliationInfo>
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<LastName>De Kauwe</LastName>
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<Affiliation>Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia.</Affiliation>
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<LastName>Medlyn</LastName>
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<Affiliation>Department of Atmospheric Sciences, University of Illinois, 105 South Gregory Street, Urbana, IL, 61801-3070, USA.</Affiliation>
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