Dynamic Changes of Carbon Source and Sink in Different Grassland Communities in Three Gorges Reservoir Area Based on BIOME-BGC Model
In this paper,three typical grassland communities,the meteorological data and the basic data (longitude and latitude,elevation,vegetation type,soil texture,etc.) were applied to estimate grassland NPP,NEP and carbon(C) storage in the Three Gorges reservoir area from 1999 to 2013 based on the BIOME-BGC model.Meanwhile,the interannual and seasonal change,and the correlations between vegetation NPP,NEP and temperature,precipitation were explored.Results indicated that the annual variation of vegetation NPP and NEP presented inverted U-shape,and reached maximum in July and August,showing obvious changing characteristics from C source to C sink and then to C source.The average NEP of three grassland communities were 6.63,4.85 and 4.17 gC · m-2 · a-1,showing obvious C sink function.There was a significant positive correlation between NEP and temperature,and negative correlation with the precipitation.And the diverse responses of the NPP of different grassland communities to hydrothermal factors were obvious.The total C storage of the three grassland communities were 33 979,50 750,29 236 gC · m-2 Besides,soil organic C stock was the largest one,accounting for 85％ to 90％ of the total;and the vegetation C storage was the least one,accounting for about 3％ to 4％.
carbon sinkgrassland communityBIOME-BGC modelcarbon cycleThree Gorges reservoir area
NETL
NSTL
万方数据
维普
