| The impact of ecological water transport on the regional ecological environment in the lower Shiyang River |
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| DOI：10.7606/j.issn.1000-7601.2020.01.26 |
| Key Words: ecological water transport ecological environment spatial heterogeneity RS GIS lower reaches of Shiyang River |
| Author Name | Affiliation | | LEI Li | Wuwei Occupational College, Wuwei, Gansu 733000, China | | WEI Wei | College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China | | ZHOU Junju | College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China | | LI Zhenya | College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| This paper uses Landsat TM/OLI remote sensing images from 2001, 2006, 2009, and 2015 as data sources through Remote Sensing (RS) and Geographic Information System (GIS) techniques, by extracting vegetation coverage index (VFC), desertification index (DI), soil salinity index (MSI), soil moisture (WI), greenness index (GVI), and surface temperature index (LST), etc., to construct a Remote Sensing Ecological Environment Comprehensive Index (RSECI), and the ecological environment of the lower the Shiyang River was qualitatively and quantitatively evaluated since the implementation of the ecological water transfer project. The results showed that: (1) From the temporal change, the RSECI value increased from 0.42 in 2001 to 0.48 in 2015. This showed that the ecological environment in 2015 improved significantly compared to that in 2001. In addition, in the initial stage of ecological water transport, the ecological environment in the lower Shiyang River had not improved significantly, and some areas in the oasis deteriorated. However, when the ecological water transport continued, the environment of the oasis in the lower reaches of the Shiyang River had been significantly improved. (2) From the perspective of spatial changes, the environment in the desert area of the oasis was significantly improved, and the ecological environment inside the oasis was generally declining. This showed that during the period of 2001-2015, the ecological environment changed in the lower reaches of the Shiyang River have obvious spatial heterogeneity. In summary, although the overall ecological environment of the lower reaches of the Shiyang River had been significantly improved with the implementation of relevant ecological treatment projects, the deterioration of the ecological environment within the oasis cannot be ignored, and the local ecological environment management still has a long way to go. |
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