TY - JOUR
T1 - Joint control of terrestrial gross primary productivity by plant phenology and physiology
AU - Xia, Jianyang
AU - Niu, Shuli
AU - Ciais, Philippe
AU - Janssens, Ivan A.
AU - Chen, Jiquan
AU - Ammann, Christof
AU - Arain, Altaf
AU - Blanken, Peter D.
AU - Cescatti, Alessandro
AU - Bonal, Damien
AU - Buchmann, Nina
AU - Curtis, Peter S.
AU - Chen, Shiping
AU - Dong, Jinwei
AU - Flanagan, Lawrence B.
AU - Frankenberg, Christian
AU - Georgiadis, Teodoro
AU - Gough, Christopher M.
AU - Hui, Dafeng
AU - Kiely, Gerard
AU - Li, Jianwei
AU - Lund, Magnus
AU - Magliulo, Vincenzo
AU - Marcolla, Barbara
AU - Merbold, Lutz
AU - Montagnani, Leonardo
AU - Moors, Eddy J.
AU - Olesen, Jørgen E.
AU - Piao, Shilong
AU - Raschi, Antonio
AU - Roupsard, Olivier
AU - Suyker, Andrew E.
AU - Urbaniak, Marek
AU - Vaccari, Francesco P.
AU - Varlagin, Andrej
AU - Vesala, Timo
AU - Wilkinson, Matthew
AU - Weng, Ensheng
AU - Wohlfahrt, Georg
AU - Yan, Liming
AU - Luo, Yiqi
PY - 2015/3/3
Y1 - 2015/3/3
N2 - Terrestrial gross primary productivity (GPP) varies greatly over time and space. A better understanding of this variability is necessary for more accurate predictions of the future climate-carbon cycle feedback. Recent studies have suggested that variability in GPP is driven by a broad range of biotic and abiotic factors operating mainly through changes in vegetation phenology and physiological processes. However, it is still unclear howplant phenology and physiology can be integrated to explain the spatiotemporal variability of terrestrial GPP. Based on analyses of eddy-covariance and satellite-derived data, we decomposed annual terrestrial GPP into the length of the CO2 uptake period (CUP) and the seasonalmaximal capacity of CO2 uptake (GPPmax). The product of CUP and GPPmax explained >90% of the temporal GPP variability in most areas of North America during 2000-2010 and the spatial GPP variation among globally distributed eddy flux tower sites. It also explained GPP response to the European heatwave in 2003 (r2 = 0.90) and GPP recovery after a fire disturbance in South Dakota (r2 = 0.88). Additional analysis of the eddy-covariance flux data shows that the interbiome variation in annual GPP is better explained by that in GPPmax than CUP. These findings indicate that terrestrial GPP is jointly controlled by ecosystem-level plant phenology and photosynthetic capacity, and greater understanding of GPPmax and CUP responses to environmental and biological variations will, thus, improve predictions of GPP over time and space.
AB - Terrestrial gross primary productivity (GPP) varies greatly over time and space. A better understanding of this variability is necessary for more accurate predictions of the future climate-carbon cycle feedback. Recent studies have suggested that variability in GPP is driven by a broad range of biotic and abiotic factors operating mainly through changes in vegetation phenology and physiological processes. However, it is still unclear howplant phenology and physiology can be integrated to explain the spatiotemporal variability of terrestrial GPP. Based on analyses of eddy-covariance and satellite-derived data, we decomposed annual terrestrial GPP into the length of the CO2 uptake period (CUP) and the seasonalmaximal capacity of CO2 uptake (GPPmax). The product of CUP and GPPmax explained >90% of the temporal GPP variability in most areas of North America during 2000-2010 and the spatial GPP variation among globally distributed eddy flux tower sites. It also explained GPP response to the European heatwave in 2003 (r2 = 0.90) and GPP recovery after a fire disturbance in South Dakota (r2 = 0.88). Additional analysis of the eddy-covariance flux data shows that the interbiome variation in annual GPP is better explained by that in GPPmax than CUP. These findings indicate that terrestrial GPP is jointly controlled by ecosystem-level plant phenology and photosynthetic capacity, and greater understanding of GPPmax and CUP responses to environmental and biological variations will, thus, improve predictions of GPP over time and space.
KW - Climate extreme
KW - Ecosystem carbon uptake
KW - Growing season length
KW - Photosynthetic capacity
KW - Spatiotemporal variability
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U2 - 10.1073/pnas.1413090112
DO - 10.1073/pnas.1413090112
M3 - Article
C2 - 25730847
AN - SCOPUS:84924363551
SN - 0027-8424
VL - 112
SP - 2788
EP - 2793
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 9
ER -