水保所知识产出(1956---)知识库

Vegetation is an important component of the terrestrial ecosystem, driven by climate change and human activ-
ities. Quantifying the relative contributions of climate change and anthropogenic activities to vegetation dynam-
ics are essential to cope with global climate change. In this paper, the relative contributions of anthropogenic
activities and climate change to net primary productivity (NPP) in China were analyzed by a two-step method-
ology based on the residual trend analysis(RESTREND). Firstly, the unaltered natural vegetation only affected by
climate change (V climate ) and the vegetation affected by climate change and human activities (V climate+human )
were separated by the multi-temporal land use land cover (LULC) data. Secondly, RESTREND was applied to
NPP of V climate and V climate+human , respectively, to calculate contributions of climatic factors and human activities
to vegetation growth. Results revealed that NPP exhibited a significant increase with 3.13 g C m −2 yr −1 from
2001 to 2016 in China. Climate change and human activities both made favorable impacts on vegetation growth
during the study period. Besides, with the separation of V climate and V climate+human , contributions of climatic fac-
tors to vegetation changes increased from 1.57 to 1.88 g C m −2 yr −1 , with the proportion of 60.06%. While con-
tributions of human activities to NPP decreased from 1.56 to 1.25 g C m −2 yr −1 , with the proportion of 39.94%.
Moreover, the average contributions of precipitation, temperature, solar radiation, and other climatic factors to
NPP over the entire country were 0.72, 0.24, 0.61, and 0.31 g C m −2 yr −1 . Precipitation played a decisive role
in vegetation changes in arid and semi-arid regions, temperature was the dominant factor for alpine vegetation
dynamics, and solar radiation was beneficial to vegetation growth in most areas of China.