Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 243, Issue -, Pages 9-18Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2017.05.009
Keywords
Net ecosystem productivity; Interannual variation; Net carbon uptake period; Maximum carbon uptake amplitude; Phenology; Climate
Categories
Funding
- CFCAS
- NSERC
- BIOCAP
- Environment Canada
- NRCan
- CarboEuropeIP
- FAO-GTOS-TCO
- iLEAPS
- Max Planck Institute for Biogeochemistry
- National Science Foundation
- University of Tuscia
- Universite Laval and Environment Canada
- US Department of Energy
- National Natural Science Foundation of China [31625006]
- Ministry of Science and Technology of China [2013CB956300]
- CAS Strategic Priority Research Program [XDA05050702]
- Thousand Youth Talents Plan
- Midwestern Regional Center of NICCR [DE-FC02-06ER64158]
- FASET
- NSF [DEB-0911461]
- U.S. National Science Foundation [1552976, 1632810]
- USDA National Institutes of Food and Agriculture Hatch project [228396]
- China Scholarship Council
- Directorate For Geosciences
- ICER [1523628] Funding Source: National Science Foundation
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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 NEP,, which in turn help describe the seasonal and interannual variability of NEP.
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