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<p>Vegetation is a key component of terrestrial ecosystems. Based on the Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data from March 2003 to February 2022, the land vegetation dataset of the Qinghai-Tibetan Plateau in 2020, and ERA5-Land reanalysis meteorological data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), this study investigated the spatiotemporal variation patterns of NDVI across the Qinghai-Tibetan Plateau and its response mechanisms to climatic factors. The results indicated that the regional NDVI value of the Qinghai-Tibetan Plateau ranged from 0.2241 to 0.2529 during 2003–2022, showing an overall increasing trend with an annual growth rate of 0.001 per year. Over the past 20 years, vegetation conditions improved across 73.27% of the plateau’s total area, mainly concentrated in the eastern Qinghai-Tibetan Plateau. From a seasonal perspective, winter contributed more to NDVI improvement than the other three seasons. The area with continuous vegetation improvement accounted for 42.32% of the entire plateau, and the eastern plateau exhibited a better continuous improvement status than the western part. Geodetector results revealed that the interaction between total precipitation (TP) and 2&#xa0;m dewpoint temperature(D2M) exhibited the strongest explanatory power for the spatial distribution of NDVI, with a q statistic of 0.653. Precipitation and temperature were the dominant limiting factors affecting the spatial pattern of NDVI over the Qinghai-Tibetan Plateau.</p>

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20-year evolution of NDVI and its response mechanisms to climatic factors on the Qinghai-Tibetan Plateau

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Yuanyuan Wei,
  • Yongsheng Hao,
  • Jia Xu,
  • Yifan Jia

摘要

Vegetation is a key component of terrestrial ecosystems. Based on the Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data from March 2003 to February 2022, the land vegetation dataset of the Qinghai-Tibetan Plateau in 2020, and ERA5-Land reanalysis meteorological data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), this study investigated the spatiotemporal variation patterns of NDVI across the Qinghai-Tibetan Plateau and its response mechanisms to climatic factors. The results indicated that the regional NDVI value of the Qinghai-Tibetan Plateau ranged from 0.2241 to 0.2529 during 2003–2022, showing an overall increasing trend with an annual growth rate of 0.001 per year. Over the past 20 years, vegetation conditions improved across 73.27% of the plateau’s total area, mainly concentrated in the eastern Qinghai-Tibetan Plateau. From a seasonal perspective, winter contributed more to NDVI improvement than the other three seasons. The area with continuous vegetation improvement accounted for 42.32% of the entire plateau, and the eastern plateau exhibited a better continuous improvement status than the western part. Geodetector results revealed that the interaction between total precipitation (TP) and 2 m dewpoint temperature(D2M) exhibited the strongest explanatory power for the spatial distribution of NDVI, with a q statistic of 0.653. Precipitation and temperature were the dominant limiting factors affecting the spatial pattern of NDVI over the Qinghai-Tibetan Plateau.