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| DOI： |
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| Risk Assessment of the Aquatic Ecosystem of Chishui River Basin Using GIS and RS: Taking Renhuai City as an Example |
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ZHAO Weiquan, LI Wei, SU Weici
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Institute of Mountain Resource of Guizhou Province, Guiyang 550001, China
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| Abstract: |
| Taking Renhuai City located at the middle reach of the Chishui River basin as an example, this paper investigated the impact of change inland use and cover on aquatic ecological system risk and its spatial distribution using GIS and RS method as well asthe ecological risk index (ERI) model. We assessed the evolution of the ecological risk and proposed mitigation methods to safeguard the ecological health of Renhuai city through land usage change. The main results are as follows. ①During 2000—2014, the areas covered by forest, water, parks and construction increased, while the areas of arable crops, shrubs and grasslands decreased. ②The ecological risk of the land in Renhuai City showed a strong regional variation increasing from the southwest to the northeast, with the ecological risk in the central, established residential and industrial areas higher than that in the surrounding areas. ③The ecological risk in most of the studied area was moderate to high, accounting for more than 50% and 65% of the total areas in 2000 and 2014 respectively. In conclusion, the ecological pressure to Renhuai City has increased steadily over the past years, and it is hence important for policy makers to ensure that the ecological risk areas would not increase further. Future work should focus on improving ecological management and restoration, and rationalizing land utilization. |
| Key words: ecological risk; land use/cover; GIS; Chishui River Basin |
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