| Spatial\|temporal evolution characteristics of landscape ecological risk in the transboundary basin of Amu Darya River, Central Asia |
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| DOI：10.7606/j.issn.1000-7601.2022.01.14 |
| Key Words: Central Asia land use landscape ecological risk temporal and spatial pattern transboundary watershed |
| Author Name | Affiliation | | MO Guifen | College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550025, China
Key Laboratory of Digital Earth Science, Aerospace Information Research Institute,Chinese Academy of Science, Beijing 100094, China | | FENG Jianzhong | Agricultural Information Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | WANG Zhongmei | College of Resources and Environmental Engineering, Guizhou University, Guiyang, Guizhou 550025, China | | BAI Linyan | Key Laboratory of Digital Earth Science, Aerospace Information Research Institute,Chinese Academy of Science, Beijing 100094, China | | LI Hualin | Key Laboratory of Digital Earth Science, Aerospace Information Research Institute,Chinese Academy of Science, Beijing 100094, China |
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| Abstract: |
| Based on the six periods of land use remote sensing data in the Amu Darya River basin in Central Asia from 1995 to 2018, the landscape ecological risk index model, semi\|variance analysis and spatial autocorrelation methods were used to analyze the temporal and spatial evolution of landscape ecological risks in the cross\|border basin. The results showed that: (1) Since 1995, the landscape pattern of the study area had undergone significant changes, the area of bare land has increased the most (22 704.66 km2), with woodland, grassland and water bodies transferred mainly. The area of water bodies had decreased the most, with the proportion falling from 6.36% to 3.12%, mainly transferred out to grassland and bare land. (2) The high\|risk area in the region presented the polarization characteristics of the upstream of the watershed being concentrated and expanding outward, while the downstream was shrinking, and the ecological risks of Aral Sea lake was significantly increased. Except for the decrease in the area of low\|risk grade (-32.22%), the areas of the other ecological risk grades had increased to varying degrees, and the landscape ecological risk tends to deteriorate. (3) The Moran’s I value of the six stages of landscape ecological risk in the basin were all above 0.77, showing strong spatial aggregation distribution characteristics. The high\|high agglomeration areas were mainly distributed in the southwest, southeast of the study area and Aral Sea Delta, while the low\|low agglomeration areas were mainly located in the north and east of the study area. |
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