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<p>The Qinghai-Tibetan Plateau (QTP) serves as a vital ecological security barrier in China and globally. Evaluating changes in ecological quality on the QTP provides critical insights for regional conservation initiatives. This study, tailored to the unique characteristics of the region, develops an Improved Remote Sensing Ecological Index (IRSEI) framework by integrating Gross Primary Productivity (GPP) with the Normalized Difference Vegetation Index (NDVI), humidity (WET), Land Surface Temperature (LST), and the Negative Drought Index (NDBSI). This comprehensive index aims to provide a more precise assessment of the environmental quality of the alpine ecosystem. It investigates spatial and temporal variations in ecological quality across the QTP, as well as within individual geographic subregions from 2000 to 2020. The first principal component accounts for an average variance of 63.69%. Over the past 20 years, the spatial distribution pattern of IRSEI on the QTP has shown lower values in the northwest, higher values in the southeast, and predominantly poor grades throughout the region. The mean trend coefficient for IRSEI was 0.002, indicating a gradual improvement in ecological quality on the QTP over time. Among 11 influencing factors examined, NDVI and GPP exhibit significant positive correlation with ecological quality, with <i>q</i> statistics of 0.942 and 0.932, respectively, underscoring the substantial impact of vegetation cover on ecosystem quality. These findings provide a robust theoretical foundation for supporting ecological management, restoration efforts, and the evaluation of ecological restoration within the QTP, thereby promoting ecosystem balance.</p>

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Spatiotemporal change in ecological quality of the Qinghai-Tibetan Plateau based on an improved remote sensing ecological index and Google Earth Engine platform

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Jing Shi,
  • Jie Gong,
  • Yunxia Zhang,
  • Guobin Kan

摘要

The Qinghai-Tibetan Plateau (QTP) serves as a vital ecological security barrier in China and globally. Evaluating changes in ecological quality on the QTP provides critical insights for regional conservation initiatives. This study, tailored to the unique characteristics of the region, develops an Improved Remote Sensing Ecological Index (IRSEI) framework by integrating Gross Primary Productivity (GPP) with the Normalized Difference Vegetation Index (NDVI), humidity (WET), Land Surface Temperature (LST), and the Negative Drought Index (NDBSI). This comprehensive index aims to provide a more precise assessment of the environmental quality of the alpine ecosystem. It investigates spatial and temporal variations in ecological quality across the QTP, as well as within individual geographic subregions from 2000 to 2020. The first principal component accounts for an average variance of 63.69%. Over the past 20 years, the spatial distribution pattern of IRSEI on the QTP has shown lower values in the northwest, higher values in the southeast, and predominantly poor grades throughout the region. The mean trend coefficient for IRSEI was 0.002, indicating a gradual improvement in ecological quality on the QTP over time. Among 11 influencing factors examined, NDVI and GPP exhibit significant positive correlation with ecological quality, with q statistics of 0.942 and 0.932, respectively, underscoring the substantial impact of vegetation cover on ecosystem quality. These findings provide a robust theoretical foundation for supporting ecological management, restoration efforts, and the evaluation of ecological restoration within the QTP, thereby promoting ecosystem balance.