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Spatiotemporal Responses and Vulnerability of Vegetation to Drought in the Ili River Transboundary Basin: A Comprehensive Analysis Based on Copula Theory, SPEI, and NDVI
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Spatiotemporal Responses and Vulnerability of Vegetation to Drought in the Ili River Transboundary Basin: A Comprehensive Analysis Based on Copula Theory, SPEI, and NDVI
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Journal Article
Spatiotemporal Responses and Vulnerability of Vegetation to Drought in the Ili River Transboundary Basin: A Comprehensive Analysis Based on Copula Theory, SPEI, and NDVI
2025
Overview
The Ili River Transboundary Basin is an important area within the Belt and Road Initiative, and its ecological security impacts China–Kazakhstan diplomatic relations and the building of the Belt and Road Initiative. Using the copula method, this study quantifies the vulnerability of vegetation to drought in the Ili River Transboundary Basin based on the Normalized Difference Vegetation Index (NDVI) and the Standardized Precipitation Evapotranspiration Index (SPEI). The vulnerability of vegetation in the Ili River Transboundary Basin is highest in June, with the proportion of highly vulnerable areas reaching 63.29% under extreme drought conditions. As the drought severity increases, the probability of vegetation loss rises, with vegetation being affected the most in June. From May to June, drought-prone areas are mainly located in Almaty Oblast and East Kazakhstan. From July to September, drought-prone areas are mainly found in the Ili River Valley and southeastern Almaty Oblast. Rainfed croplands are most susceptible to drought, while, for irrigated croplands, higher drought severity enhances the mitigating effect of irrigation measures. Vegetation areas are most affected by drought in semi-arid regions, particularly in summer. These findings offer valuable scientific support for drought management and sustainable development in the region.
Publisher
MDPI AG
Subject
