Simulation and Evaluation of Terrestrial Ecosystem NPP with M-SDGVM over Continental China |
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| Authors: | MAO Jiafu DAN Li WANG Bin and DAI Yongjiu |
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| Institution: | State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,START-TEA and RCE-TEA, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,School of Geography, Beijing Normal University, Beijing 100875 |
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| Abstract: | Using the regional terrestrial Net Primary Production (NPP) from different
observations and models over China, we validated the NPP simulations and
explored the relationship between NPP and climate variation at interannual
and decadal scales in the Modified Sheffield Dynamic Global Vegetation Model
(M-SDGVM) during 1981--2000. M-SDGVM shows agreement with the NPP data from
743 sites under the Global Primary Production Data Initiative (GPPDI). The
spatial and the zonal averaged NPP of M-SDGVM agree well with different
historic datasets and are closest to the IGBP NPP. Compared to the 1980s,
NPP in the 1990s increases in most of China with a high degree of spatial
heterogeneity. The multi-year mean NPP of forest types is reasonably modeled
(above 500 g C m-2 yr-1 while that of C3 path of
photosynthesis (C3 grasslands is underestimated. The NPP of 7 M-SDGVM
main plant functional types (PFTs) increases and the increment of the
broad-leaved deciduous forest is the most obvious (5.05 g C m-2
yr-1. During the studied period, the annual NPP of M-SDGVM over China
increases, with significant fluctuations, at an average rate of 0.0164 Gt C
yr-1. Regulated by annual temperature and precipitation, the interannual
variation of the total NPP shows more significant correlation with
temperature (relativity and probability are R=0.61, P=0.00403) than
precipitation (R=0.40, P=0.08352). CO2 fertilization may play a key
role in the increase of terrestrial ecosystem NPP over continental China,
and CO2 stimulation increases with CO2 concentrations, and also
with the climate variability of the 1980s and 1990s. |
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| Keywords: | Net Primary Production dynamic global vegetation model China |
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