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| DOI：10.13522/j.cnki.ggps.2025077 |
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| Spatiotemporal dynamics of ecological-environmental quality and its driving factors in the Inner Mongolia Section of the Yellow River Basin |
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QI Shuai, YUAN Ruiqiang, XUE Yu, DUAN Cheng, LIU Yan
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1. Institute of Geological Survey, Inner Mongolia Autonomous Region, Hohhot 010020, China;
2. School of Resources and Environmental Economics, Inner Mongolia University of Finance and Economics, Hohhot 010070, China
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| Abstract: |
| 【Objective】The Inner Mongolia section of the Yellow River Basin is an ecologically fragile region that plays a critical role in environmental security of northern China. Long-term monitoring of its habitat quality and its underlying determinants is essential for effective ecological protection. This paper proposes a method to track the spatiotemporal changes of the ecological environment quality in the region from 2000 to 2022 and identify the primary drivers of the changes.【Method】Remote sensing data from Landsat-5 TM, Landsat-8 OLI and Landsat-9 OLI2 were used as the main data sources. Based on the Google Earth Engine (GEE) platform, a Kernel-based Salinity Remote Sensing Ecological Index (KSRSEI), which incorporates kNDVI and the Comprehensive Salinity Index (CSI), was proposed to calculate ecological and environmental quality. The Theil-Sen estimator and Mann-Kendall test were used to assess the temporal change of the environmental quality, and the Hurst index was used to evaluate ecological sustainability. A centroid shift model was applied to analyze the spatial displacement of ecological quality; partial correlation analysis of temperature and precipitation and land cover were used to identify influencing factors.【Result】Between 2000 and 2022, mean ecological environment quality values ranged from 0.341 1 to 0.448 1. The environmental quality in the region had improved at an average rate of 0.031/10 a from 2000 to 2013, followed by a decline from 2013 to 2022 at an average rate of 0.024/10 a. Spatially, ecological quality was the highest in the Hetao Plain, Daqing Mountains, and Lüliang Mountains, and the lowest in the Kubuqi Desert and Mu Us Sandy Land with persistent soil degradation. Overall, 13.55% of the study area saw significant improvement in environmental quality, 13.56% experienced significant decline, and 72.89% remained stable.【Conclusion】Ecological and environmental quality in the Inner Mongolia section of the Yellow River Basin is spatiotemporally heterogeneous, with precipitation being the most important influencing factor, underscoring the importance of climate in shaping ecosystem dynamics. These findings are helpful for ecological restoration, water management and sustainable land use in the region. |
| Key words: Kernel Salinity Remote Sensing Ecological Index(KSRSEI); Google Earth Engine; characteristics of spatial-temporal variation; the Inner Mongolia section of the Yellow River Basin |
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