1982-2021年天山NDVI时空变化及影响因素OA

Vegetation dynamics are driven by multiple factors and are particularly sensitive to climate in arid and semi-arid regions.The Tianshan Mountains,as the largest mountain range in the world's arid regions,have undergone significant vegetation changes,yet the drivers behind these changes and their relative contributions remain insufficiently understood.To address this,we used Theil-Sen median trend analysis and Mann-Kendall test to analyze interannual and seasonal spatiotemporal patterns from 1982 to 2021,and applied a Geodetector model to quantify the effects of natural factors on the normalized difference vegetation index(NDVI).Results revealed an overall increasing trend in NDVI(slope 0.001 6 a-1),indicating a marked greening,with localized degradation in the northern part of the central Tianshan.The spatial distribution of vegetation was primarily shaped by interactions among elevation,precipitation,and temperature,as well as between these factors and other environmental variables(e.g.,VPD).The impact of climatic factors on vegetation change has increased significantly over the period.This study provides a scientific basis for informing ecological security and sustainable development in the Tianshan.