Coupled effects of climate change and human activities on vegetation dynamics in the Southwestern Alpine Canyon Region of China  

作　　者：LAI Jinlin QI Shi 

机构地区：[1]School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China

出　　处：《Journal of Mountain Science》2024年第10期3234-3248,共15页山地科学学报（英文）

基　　金：funded by the National Key Research and Development Program of China(Grant No.2022YFF1302903).

摘　　要：The driving effects of climate change and human activities on vegetation change have always been a focal point of research.However,the coupling mechanisms of these driving factors across different temporal and spatial scales remain controversial.The Southwestern Alpine Canyon Region of China(SACR),as an ecologically fragile area,is highly sensitive to the impacts of climate change and human activities.This study constructed a vegetation cover dataset for the SACR based on the Enhanced Vegetation Index(EVI)from 2000 to 2020.Spatial autocorrelation,Theil-Sen trend,and Mann-Kendall tests were used to analyze the spatiotemporal characteristics of vegetation cover changes.The main drivers of spatial heterogeneity in vegetation cover were identified using the optimal parameter geographic detector,and an improved residual analysis model was employed to quantify the relative contributions of climate change and human activities to interannual vegetation cover changes.The main findings are as follows:Spatially,vegetation cover exceeds 60%in most areas,especially in the southern part of the study area.However,the border area between Linzhi and Changdu exhibits lower vegetation cover.Climate factors are the primary drivers of spatial heterogeneity in vegetation cover,with temperature having the most significant influence,as indicated by its q-value,which far exceeds that of other factors.Additionally,the interaction q-value between the two factors significantly increases,showing a relationship of bivariate enhancement and nonlinear enhancement.In terms of temporal changes,vegetation cover shows an overall improving trend from 2000 to 2020,with significant increases observed in 68.93%of the study area.Among these,human activities are the main factors driving vegetation cover change,with a relative contribution rate of 41.31%,while climate change and residual factors contribute 35.66%and 23.53%,respectively.By thoroughly exploring the coupled mechanisms of vegetation change,this study provides important references for the sust

关 键 词：Enhanced vegetation index Climate change Human activities Spatial heterogeneity Coupled mechanisms 

分 类 号：Q948[生物学—植物学] P467[天文地球—大气科学及气象学] X173[环境科学与工程—环境科学]