Ecological risk assessment based on landscape pattern for Dongting Lake Ecological Economic Zone
Assessment of ecological risk of Dongting Lake Economic Zone is critical for the ecological development of Dongting Lake Economic Zone. Three Landsat TM images of 1985, 2005 and 2015 were utilized to identify land use / land cover. GIS technology and geostatistics were applied to construct the ecological risk index and analyzed the landscape pattern of Dongting Lake Economic Zone. Spatial distribution of ecological risk in Dongting Lake Economic Zone was further explored. The results showed that with the increase of human activities and the implementation of the policy of "Flatting embankment for flooding control and returning farmland to the lake", the built-up land and water area of Dongting Lake Eco-economic Zone continued to increase, increasing by 13.17×104hm2and 21.63×104hm2 respectively. Approximately 30 years ago, dominant areas had low ecological and medium risk. In contrast, areas of low and high ecological risk coexisted in 2015. At the same time, the area of high ecological risk area had also increased. In the 21stcentury, Due to the establishment of nature reserves in this region by the state government and the strict implementation of ecological protection in selected regions, the areas of low-ecological risk areas and low ecological risk areas had increased.
中央引导地方科技发展专项资金，国家重点研发计划项目(2017YFD0200803).The Central Government Guides Local Special Funds for The Development of Science and Technology，National Key Research and Development Project of China