Spatiotemporal Variation of Carbon Utilization Efficiency and Ecological Network Construction of Vegetation in Southeastern Xizang
The carbon cycle plays a crucial role in the global ecosystem,and the feedback effects of the carbon cycle have significant impacts on future climate change.This study focused on the southeastern region of the Xizang Autonomous Region(Linzhi and Changdu)as the research area.Using MOD17A2HGF GPP and MOD17A2HGF PSNnet data for the corresponding months and years as the primary data sources,the study explored spatiotemporal variation patterns and systematically analyzed the changes in vegetation CUE(Carbon Utilization Efficiency)in southeastern Xizang in relation to meteorological data.Furthermore,an ecological network was constructed to investigate the impact of CUE changes on the stability of the ecosystem.The results were as follows:On a monthly scale,the regional CUE showed significant variation with the growing season,with differing patterns of variation across different vegetation types.On an annual scale,CUE showed an overall non-significant upward trend,but fluctuations increased between 2019 and 2022.CUE in southeastern Xizang varied with changes in temperature and precipitation,with temperature having a more significant and stronger correlation with CUE changes.Temperature and precipitation exhibited opposite trends in their effects on CUE in this region.The number of ecological nodes and corridors in southeastern Xizang had decreased annually,indicating a need for additional ecological stepping stones to increase ecological source areas and reduce ecological corridors,thereby enhancing the stability of the southeastern Xizang ecosystem.The changes in CUE within the ecological source areas of southeastern Xizang had particularly notable impacts on the entire ecosystem.
Southeastern XizangCarbon utilization efficiencySpatiotemporal variationNetwork construction
万方数据
维普
