TY - JOUR
T1 - Climate controls over the net carbon uptake period and amplitude of net ecosystem production in temperate and boreal ecosystems
AU - Fu, Zheng
AU - Stoy, Paul C.
AU - Luo, Yiqi
AU - Chen, Jiquan
AU - Sun, Jian
AU - Montagnani, Leonardo
AU - Wohlfahrt, Georg
AU - Rahman, Abdullah F.
AU - Rambal, Serge
AU - Bernhofer, Christian
AU - Wang, Jinsong
AU - Shirkey, Gabriela
AU - Niu, Shuli
N1 - Funding Information:
We thank the FLUXNET site PIs for contributing data, the agencies and institutions that funded long-term measurements at these sites, and the networks to which the sites belong, particularly AmeriFlux and CarboEuropeIP. This work used eddy covariance data acquired by the FLUXNET community and in particular by the following networks: AmeriFlux (U.S. Department of Energy, Biological and Environmental Research, Terrestrial Carbon Program (DE-FG02-04ER63917 and DE-FG02-04ER63911)), AfriFl, AsiaFlux, CarboAfrica, CarboEuropeIP, CarboItaly, CarboMont, ChinaFlux, Fluxnet-Canada (supported by CFCAS, NSERC, BIOCAP, Environment Canada, and NRCan), GreenGrass, KoFlux, LBA, NECC, OzFlux, TCOS-Siberia, USCCC. We acknowledge the financial support to the eddy covariance data harmonization provided by CarboEuropeIP, FAO-GTOS-TCO, iLEAPS, Max Planck Institute for Biogeochemistry, National Science Foundation, University of Tuscia, Université Laval and Environment Canada and US Department of Energy and the database development and technical support from Berkeley Water Center, Lawrence Berkeley National Laboratory, Microsoft Research eScience, Oak Ridge National Laboratory, University of California-Berkeley, University of Virginia. This work was financially supported by the National Natural Science Foundation of China (31625006), the Ministry of Science and Technology of China (2013CB956300), CAS Strategic Priority Research Program (XDA05050702), and the “Thousand Youth Talents Plan”. US-UMB site were supported by the Midwestern Regional Center of NICCR (DE-FC02-06ER64158), as part of the FASET project and NSF grant DEB-0911461. PCS acknowledges contributions from the U.S. National Science Foundation (1552976, 1632810) and the USDA National Institutes of Food and Agriculture Hatch project 228396. ZF gratefully acknowledges the China Scholarship Council for the financial support of a 24-month study at Montana State University.
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/9/15
Y1 - 2017/9/15
N2 - The seasonal and interannual variability of the terrestrial carbon cycle is regulated by the interactions of climate and ecosystem function. However, the key factors and processes determining the interannual variability of net ecosystem productivity (NEP) in different biomes are far from clear. Here, we quantified yearly anomalies of seasonal and annual NEP, net carbon uptake period (CUP), and the maximum daily NEP (NEPmax) in response to climatic variables in 24 deciduous broadleaf forest (DBF), evergreen forest (EF), and grassland (GRA) ecosystems that include at least eight years of eddy covariance observations. Over the 228 site-years studied, interannual variations in NEP were mostly explained by anomalies of CUP and NEPmax. CUP was determined by spring and autumn net carbon uptake phenology, which were sensitive to annual meteorological variability. Warmer spring temperatures led to an earlier start of net carbon uptake activity and higher spring and annual NEP values in DBF and EF, while warmer autumn temperatures in DBF, higher autumn radiation in EF, and more summer and autumn precipitation in GRA resulted in a later ending date of net carbon uptake and associated higher autumn and annual NEP. Anomalies in NEPmax s were determined by summer precipitation in DBF and GRA, and explained more than 50% of variation in summer NEP anomalies for all the three biomes. Results demonstrate the role of meteorological variability in controlling CUP and NEPmax, which in turn help describe the seasonal and interannual variability of NEP.
AB - The seasonal and interannual variability of the terrestrial carbon cycle is regulated by the interactions of climate and ecosystem function. However, the key factors and processes determining the interannual variability of net ecosystem productivity (NEP) in different biomes are far from clear. Here, we quantified yearly anomalies of seasonal and annual NEP, net carbon uptake period (CUP), and the maximum daily NEP (NEPmax) in response to climatic variables in 24 deciduous broadleaf forest (DBF), evergreen forest (EF), and grassland (GRA) ecosystems that include at least eight years of eddy covariance observations. Over the 228 site-years studied, interannual variations in NEP were mostly explained by anomalies of CUP and NEPmax. CUP was determined by spring and autumn net carbon uptake phenology, which were sensitive to annual meteorological variability. Warmer spring temperatures led to an earlier start of net carbon uptake activity and higher spring and annual NEP values in DBF and EF, while warmer autumn temperatures in DBF, higher autumn radiation in EF, and more summer and autumn precipitation in GRA resulted in a later ending date of net carbon uptake and associated higher autumn and annual NEP. Anomalies in NEPmax s were determined by summer precipitation in DBF and GRA, and explained more than 50% of variation in summer NEP anomalies for all the three biomes. Results demonstrate the role of meteorological variability in controlling CUP and NEPmax, which in turn help describe the seasonal and interannual variability of NEP.
KW - Climate
KW - Interannual variation
KW - Maximum carbon uptake amplitude
KW - Net carbon uptake period
KW - Net ecosystem productivity
KW - Phenology
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U2 - 10.1016/j.agrformet.2017.05.009
DO - 10.1016/j.agrformet.2017.05.009
M3 - Article
AN - SCOPUS:85019258549
SN - 0168-1923
VL - 243
SP - 9
EP - 18
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
ER -