The net primary productivity (NPP) of global terrestrial vegetation is estimated by an Atmosphere-Vegetation Interaction Model (AVIM). AVIM consists of two intercoupled components: physical processes, involving water ...The net primary productivity (NPP) of global terrestrial vegetation is estimated by an Atmosphere-Vegetation Interaction Model (AVIM). AVIM consists of two intercoupled components: physical processes, involving water and energy transfer among soil, vegetation and the atmosphere at the land surface and eco-physiological processes, i.e. photosynthesis, respiration, dry matter allocation, littering, phenology. Globally vegetation is classified into 13 types and soil texture is classified into 6 types. The estimated NPP for different vegetation types at 1637 sites are validated with the observed data provided by EMDI. The main results of NPP estimation show that global averaged NPP is 405.13 g C m(-2)yr(-1), varying from 99.58 g C m(-2)yr(-1) (tundra) to 996.2 g m(-2)yr(-1) (rainforest). Global total annual NPP is about 60.72Gt C yr(-1), in which the maximum part, about 15.84 Gt C yr(-1), accounting for 26.09% of the total is contributed by tropical rainforest. The maximum carbon sink occurs in the temperate region of the Northern Hemisphere. The global spatial and seasonal distribution of terrestrial NPP is estimated reasonably.展开更多
基金This study was supported by National Key Basic Research Development Program (G1999043400).
文摘The net primary productivity (NPP) of global terrestrial vegetation is estimated by an Atmosphere-Vegetation Interaction Model (AVIM). AVIM consists of two intercoupled components: physical processes, involving water and energy transfer among soil, vegetation and the atmosphere at the land surface and eco-physiological processes, i.e. photosynthesis, respiration, dry matter allocation, littering, phenology. Globally vegetation is classified into 13 types and soil texture is classified into 6 types. The estimated NPP for different vegetation types at 1637 sites are validated with the observed data provided by EMDI. The main results of NPP estimation show that global averaged NPP is 405.13 g C m(-2)yr(-1), varying from 99.58 g C m(-2)yr(-1) (tundra) to 996.2 g m(-2)yr(-1) (rainforest). Global total annual NPP is about 60.72Gt C yr(-1), in which the maximum part, about 15.84 Gt C yr(-1), accounting for 26.09% of the total is contributed by tropical rainforest. The maximum carbon sink occurs in the temperate region of the Northern Hemisphere. The global spatial and seasonal distribution of terrestrial NPP is estimated reasonably.
