中国陆地生态系统净初级生产力时空特征模拟

摘要

In this paper, we use CEVSA, a process-based model, which has been validated onregional and global scales, to explore the temporal and spatial patterns of Net Primary Productivity(NPP) and its responses to interannual climate fluctuations in China's terrestrial ecosystems over theperiod 1981-1998. The estimated results suggest that, in this study period, the averaged annual totalNPP is about 3.09 Gt C/yr-1 and average NPP is about 342 g C/m2. The results also showed that theprecipitation was the key factor determining the spatial distribution and temporal trends of NPP.Temporally, the total NPP exhibited a slowly increasing trend. In some ENSO years (e.g. 1982,1986, 1997) NPP decreased clearly compared to the previous year, but the relationship betweenENSO and NPP is complex due to the integrated effects of monsoons and regional differentiation.Spatially, the relatively high NPP occurred at the middle high latitudes, the low latitudes and thelower appeared at the middle latitudes. On national scale, precipitation is the key control factor onNPP variations and there exists a weak correlation between NPP and temperature, but regionalresponses are greatly different.