Evidence for a weakening relationship between interannual temperature variability and northern vegetation activity.
Identifieur interne : 003969 ( Main/Exploration ); précédent : 003968; suivant : 003970Evidence for a weakening relationship between interannual temperature variability and northern vegetation activity.
Auteurs : Shilong Piao [République populaire de Chine] ; Huijuan Nan [République populaire de Chine] ; Chris Huntingford [Royaume-Uni] ; Philippe Ciais [France] ; Pierre Friedlingstein [Royaume-Uni] ; Stephen Sitch [Royaume-Uni] ; Shushi Peng [France] ; Anders Ahlström [Suède] ; Josep G. Canadell [Australie] ; Nan Cong [République populaire de Chine] ; Sam Levis [États-Unis] ; Peter E. Levy [Royaume-Uni] ; Lingli Liu [République populaire de Chine] ; Mark R. Lomas [Royaume-Uni] ; Jiafu Mao [États-Unis] ; Ranga B. Myneni [États-Unis] ; Philippe Peylin [France] ; Ben Poulter [France] ; Xiaoying Shi [États-Unis] ; Guodong Yin [République populaire de Chine] ; Nicolas Viovy [France] ; Tao Wang [France] ; Xuhui Wang [République populaire de Chine] ; Soenke Zaehle [Allemagne] ; Ning Zeng [États-Unis] ; Zhenzhong Zeng [République populaire de Chine] ; Anping Chen [États-Unis]Source :
- Nature communications [ 2041-1723 ] ; 2014.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical : Soil.
- geographic : Arctic Regions.
- methods : Environmental Monitoring.
- Climate, Computer Simulation, Droughts, Ecosystem, Geography, Global Warming, Photosynthesis, Plant Physiological Phenomena, Plants, Poaceae, Satellite Imagery, Seasons, Temperature.
Abstract
Satellite-derived Normalized Difference Vegetation Index (NDVI), a proxy of vegetation productivity, is known to be correlated with temperature in northern ecosystems. This relationship, however, may change over time following alternations in other environmental factors. Here we show that above 30°N, the strength of the relationship between the interannual variability of growing season NDVI and temperature (partial correlation coefficient RNDVI-GT) declined substantially between 1982 and 2011. This decrease in RNDVI-GT is mainly observed in temperate and arctic ecosystems, and is also partly reproduced by process-based ecosystem model results. In the temperate ecosystem, the decrease in RNDVI-GT coincides with an increase in drought. In the arctic ecosystem, it may be related to a nonlinear response of photosynthesis to temperature, increase of hot extreme days and shrub expansion over grass-dominated tundra. Our results caution the use of results from interannual time scales to constrain the decadal response of plants to ongoing warming.
DOI: 10.1038/ncomms6018
PubMed: 25318638
Affiliations:
- Allemagne, Australie, France, Royaume-Uni, République populaire de Chine, Suède, États-Unis
- Maryland, New Jersey, Pékin
- College Park (Maryland), Princeton (New Jersey), Pékin
- Université de Princeton, Université de Pékin, Université du Maryland
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Le document en format XML
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</author>
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<author><name sortKey="Yin, Guodong" sort="Yin, Guodong" uniqKey="Yin G" first="Guodong" last="Yin">Guodong Yin</name>
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<author><name sortKey="Zeng, Ning" sort="Zeng, Ning" uniqKey="Zeng N" first="Ning" last="Zeng">Ning Zeng</name>
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<author><name sortKey="Zeng, Zhenzhong" sort="Zeng, Zhenzhong" uniqKey="Zeng Z" first="Zhenzhong" last="Zeng">Zhenzhong Zeng</name>
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<author><name sortKey="Chen, Anping" sort="Chen, Anping" uniqKey="Chen A" first="Anping" last="Chen">Anping Chen</name>
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<wicri:regionArea>Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544</wicri:regionArea>
<orgName type="university">Université de Princeton</orgName>
<placeName><settlement type="city">Princeton (New Jersey)</settlement>
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<series><title level="j">Nature communications</title>
<idno type="eISSN">2041-1723</idno>
<imprint><date when="2014" type="published">2014</date>
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<term>Droughts</term>
<term>Ecosystem</term>
<term>Environmental Monitoring (methods)</term>
<term>Geography</term>
<term>Global Warming</term>
<term>Photosynthesis</term>
<term>Plant Physiological Phenomena</term>
<term>Plants</term>
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<term>Simulation numérique</term>
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<front><div type="abstract" xml:lang="en">Satellite-derived Normalized Difference Vegetation Index (NDVI), a proxy of vegetation productivity, is known to be correlated with temperature in northern ecosystems. This relationship, however, may change over time following alternations in other environmental factors. Here we show that above 30°N, the strength of the relationship between the interannual variability of growing season NDVI and temperature (partial correlation coefficient RNDVI-GT) declined substantially between 1982 and 2011. This decrease in RNDVI-GT is mainly observed in temperate and arctic ecosystems, and is also partly reproduced by process-based ecosystem model results. In the temperate ecosystem, the decrease in RNDVI-GT coincides with an increase in drought. In the arctic ecosystem, it may be related to a nonlinear response of photosynthesis to temperature, increase of hot extreme days and shrub expansion over grass-dominated tundra. Our results caution the use of results from interannual time scales to constrain the decadal response of plants to ongoing warming.</div>
</front>
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<country name="Allemagne"><noRegion><name sortKey="Zaehle, Soenke" sort="Zaehle, Soenke" uniqKey="Zaehle S" first="Soenke" last="Zaehle">Soenke Zaehle</name>
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