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China’s largest interbasin water diversion project, the South-to-North Water Diversion Middle Route Project has profoundly impacted regional ecosystems by altering the hydrological regime of the Han River Basin. This study innovatively integrates MODIS and PROBA-V2 NDVI data products with multi-source environmental covariates to construct a 250-m-resolution monthly fractional vegetation cover (FVC) dataset spanning 2000–2021, systematically evaluating the spatiotemporal evolution of vegetation ecosystems in the Han River Basin before and after the project’s implementation. The results show that over the 22-year period, the vegetation coverage in the Hanjiang River Basin is relatively high (NDVImax = 0.84 ± 0.56), showing a fluctuating increasing trend (growth rate of 1.6% per decade), with the proportions of vegetation improvement and degradation areas being 25.68% and 3.43%, respectively. The overall vegetation coverage showed gradual improvement over time. While the South-to-North Water Diversion Project had minimal influence on vegetation dynamics in the upper basin, more noticeable changes occurred in the mid-lower reaches. This was particularly evident in Danjiangkou City, Nanyang City, and adjacent regions, where anthropogenic activities exerted stronger effects on vegetation variation. These findings offer valuable scientific insights for regional ecological assessments and natural resource accounting.

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Research on the Impact of the South-to-North Water Diversion Middle Route Project on Vegetation Coverage in the Hanjiang River Basin

  • 章节

  • 发表日期：

    2026年

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  • Xiaojian Yu,
  • Yulei Tang,
  • Wei Xie,
  • Qiao Wang,
  • Zhansheng Chen

摘要

China’s largest interbasin water diversion project, the South-to-North Water Diversion Middle Route Project has profoundly impacted regional ecosystems by altering the hydrological regime of the Han River Basin. This study innovatively integrates MODIS and PROBA-V2 NDVI data products with multi-source environmental covariates to construct a 250-m-resolution monthly fractional vegetation cover (FVC) dataset spanning 2000–2021, systematically evaluating the spatiotemporal evolution of vegetation ecosystems in the Han River Basin before and after the project’s implementation. The results show that over the 22-year period, the vegetation coverage in the Hanjiang River Basin is relatively high (NDVImax = 0.84 ± 0.56), showing a fluctuating increasing trend (growth rate of 1.6% per decade), with the proportions of vegetation improvement and degradation areas being 25.68% and 3.43%, respectively. The overall vegetation coverage showed gradual improvement over time. While the South-to-North Water Diversion Project had minimal influence on vegetation dynamics in the upper basin, more noticeable changes occurred in the mid-lower reaches. This was particularly evident in Danjiangkou City, Nanyang City, and adjacent regions, where anthropogenic activities exerted stronger effects on vegetation variation. These findings offer valuable scientific insights for regional ecological assessments and natural resource accounting.