College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China.
Inner Mongolia Key Laboratory of Disaster and Ecological Security on the Mongolian Plateau, Hohhot 010022, China.
Ying Yong Sheng Tai Xue Bao. 2023 Nov;34(11):2929-2937. doi: 10.13287/j.1001-9332.202311.024.
Ecological drought monitoring is important for regional status assessment and protection of water resources. In this study, we constructed a new ecological drought index, the kernel temperature vegetation drought index (kTVDI), by using the kernel normalized vegetation index (kNDVI) to improve the temperature vegetation drought index (TVDI) in Inner Mongolia. We further analyzed the spatial and temporal distribution of ecological drought in Inner Mongolia during 2000-2022 and the future trend of ecological drought by using segmented linear regression model, Theil-Sen median, Mann-Kendall test, and Hurst index. The results showed that kTVDI performed better in monitoring ecological drought than TVDI. From 2000 to 2022, kTVDI showed a decreasing trend in the growing season in Inner Mongolia, but the change was not significant, and a sudden change occurred in 2016, and the wetting trend after the sudden change was more obvious. During the study period, ecological drought in 23.6% of the areas of Inner Mongolia showed an aggravating trend, and ecological drought was alleviated in 46.5% of the area. In the future, ecological drought would be exacerbated in the eastern part but alleviated in the central and western parts of Inner Mongolia.
生态干旱监测对区域状况评估和水资源保护至关重要。本研究通过利用核标准化植被指数（kNDVI）改进温度植被干旱指数（TVDI），构建了一种新的生态干旱指数——核温度植被干旱指数（kTVDI），并进一步分析了 2000-2022 年内蒙古生态干旱的时空分布及未来趋势，采用分段线性回归模型、Theil-Sen 中位数、Mann-Kendall 检验和赫斯特指数。结果表明，kTVDI 比 TVDI 更能有效地监测生态干旱。2000-2022 年，内蒙古生长季的 kTVDI 呈下降趋势，但变化不显著，2016 年发生突变，突变后增湿趋势更为明显。研究期间，内蒙古 23.6%的地区生态干旱呈加重趋势，46.5%的地区生态干旱得到缓解。未来，内蒙古东部地区的生态干旱将加剧，而中部和西部地区的生态干旱将得到缓解。
