Ecological vulnerability and its driving forces of the Qinghai-Xizang Plateau based on the net primary productivity of vegetation
The Qinghai-Xizang Plateau is a typical ecologically-fragile area sensitive to climate change in China,and therefore a scientific assessment of the ecological vulnerability and its driving forces can help the sustainable development of the Qinghai-Xizang Plateau.However,previous studies mostly used a comprehens-ive evaluation index system,the application of which is largely limited by the high complexity and subjectivity of choosing the indicators.The single evaluation index system can not only effectively characterize the spatial pattern of ecological vulnerability,but also overcome the limitations of the above comprehensive evaluation in-dex system and greatly reduce the dependence on data.Based on the definition of ecological vulnerability by IPCC,this study used Net Primary Productivity(NPP)to investigate the spatial patterns of the ecological vul-nerability in the Qinghai-Xizang Plateau in 2000 and 2020 and then explored the driving forces by the Geode-tector.The results show that the ecological vulnerability is overall high in the Qinghai-Xizang Plateau,with 75％of the land areas at a moderate or higher vulnerability level,and the vulnerability is relatively high in the central and southern parts of the region.Also,the ecological vulnerability differs greatly by the land use,with the relatively higher variability in unused lands.The ecological vulnerability of the Qinghai-Xizang Plateau is mainly controlled by the interactions of climate,vegetation,topography and soil,with the greatest contribution by the interaction between vegetation index and water erosion modulus,and yet the explanatory power of indi-vidual factor is small.This study emphasizes the effectiveness of using a single-index system to assess the eco-logical vulnerability according to the IPCC's definition.The results of this study provide important insights for the ecological vulnerability evaluation and the ecological protection in the Qinghai-Xizang Plateau.
NETL
NSTL
万方数据
