Quantitative analysis of NDVI changes in Mu Us Sandy Land by climate change and human activities
Climate change and human activities are the primary factors influencing vegetation dynamics.The nor-malized difference vegetation index(NDVI)serves as an effective indicator for assessing vegetation changes,en-abling evaluation of ecosystem dynamics and sustainability.Using SPOT/VEGETATION NDVI time series data,meteorological data,and land cover data,this study investigates the spatiotemporal evolution characteristics and driving mechanisms of NDVI in the Mu Us Sandy Land,China,from 1998 to 2019.Employing GIS spatial analy-sis,correlation analysis,and residual analysis,the study quantifies the relative contributions of climate change and human activities to NDVI variations.The findings reveal the following:(1)From 1998 to 2019,interannual NDVI in the Mu Us Sandy Land exhibited a significant upward trend,with a growth rate of 0.0067·a-1.Spatially,NDVI displayed a gradual increase from northwest to southeast.However,the overall sustainability of NDVI growth was weak,indicating potential future fluctuations.(2)Both climate change and human activities jointly contributed to NDVI growth.NDVI changes were significantly positively correlated with precipitation,while cor-relations with temperature were weaker.Large-scale ecological projects and the interplay of climatic factors ac-counted for 86.30%of the observed vegetation improvement,aligning with existing studies on the impact of eco-logical projects.(3)Attribution analysis demonstrated that human activities contributed to 83.20%of NDVI growth,while precipitation accounted for 73.14%.The coupling effect of precipitation and human activities had a more pronounced influence on NDVI.
Mu Us Sandy Landvegetation NDVIclimatic changehuman activitiesrelative contribution rate
万方数据
维普
