The Spatiotemporal Evolution of kNDVI in the Hetao Irrigation District from 2000 to 2022 and its Driving Force Analysis
As climate change intensifies and human activities increase,vegetation change has become a key indicator of environmental response and a focus of scientific research.This study used MODIS data to analyze the Kernel Normalized Difference Vegetation Index(kNDVI)in the Hetao irrigation area from 2000 to 2022.By calculating slope,LOWESS smoothing,centroid shift models,and the Hurst index,and combining surface temperature and precipitation data,a multiple regression residual analysis was performed to assess the contributions of climate change and human activities.The results show:① The kNDVI in the Hetao irrigation area exhibited a steady increase,with an average annual growth rate of 1.51%(p＜0.001).The overall centroid shifted to the southwest,and 93.42%of the area showed a strong persistence in kNDVI change trends.② The combined contribution of climate change and human activities to kNDVI changes reached 88.75%,with joint greening as the dominant driving factor,accounting for 80.25%of the total.③ The individual contribution rates of climate change and human activities were approximately 0.21 and 0.76,respectively.This study provides new insights into the spatiotemporal evolution of kNDVI and its driving forces in the Hetao irrigation area,offering scientific evidence for regional ecological management and policy-making.
kernel normalized difference vegetation index(kNDVI)spatial and temporal evolutionclimate changehuman activitiesdriving forceHetao Irrigation Area
万方数据
维普
