| The wetland has the reputation of"gene treasure"and"kidney of the earth",which has the ecological service function and huge potential value,including material production,regulating climate,flood control water,water conservation,degradation of pollutants,biological habitat,education and scientific research,tourism leisure and so on.In recent years,the rapid development of the social economy in the Chaohu Lake area has put great pressure on the ecological environment in the region.In order to understand the dynamic changes of the landscape pattern and the change of ecological environment quality and the trend of ecosystem in the Chaohu Lake area,this paper takes the Chaohu Lake area as the research area,and obtains the remote sensing data of the research areain 1995,2005 and 2013 year based on RS,GIS and other software for technical support,the use of remote sensing to the remote interpretation of remote sensing image interpretation.Then,based on the theory of"matrix-plaque-corridor"in landscape ecology,this paper analyzes the land use status of the Chaohu Lake area by GIS and RS technology,extracting the landscape pattern,wetland distribution and other information,selecting the landscape index,Comparative analysis,accessing to the landscape pattern of dynamic changes.In addition,according to the principles of ecosystem health index and index selection,with a large number of theoretical knowledge and related research results as the support and combined with economic and social development,the application of PSR evaluation model to build a ring Chaohu Lake wetland ecological environment evaluation index system,calculated in1995,2005 and 2013,the Central Chaohu Lake Ecological Environment Comprehensive Evaluation Index(CEI),to complete the assessment of eco-environmental quality.Based on this,the future landscape pattern of Chaohu Lake area is forecasted,and the future trend of wetland ecological environment in Chaohu Lake area is analyzed.The temporal and spatial characteristics of wetland ecosystem and the distribution of wetland ecosystem in Chaohu Lake area are discussed.In order to protect regional wetland sustainable development and protection of biological diversity,suggestions and countermeasures was proposed for the future more efficient implementation of wetland protection and providing a reference for the goverment.The results are as follows:(1)From 1995 to 2013,land use has a greater degree of change,waters and arable land area continues to shrink,plaque density becomes larger,landscape elements broken.(2)In the period from1995 to 2013,the wetland of the Chaohu Lake area decreased by 784.52 hm~2,including Shengqiao Town,Huai Linzhen Town,Huanglu Town,Xiage Town and Shangpai Town Wetland,and Chaohu Lake,Chaohu City,Town,Yi Town,Yan Dianxiang,Yantun Street and other wetland area decreased by 1479.49 hm~2,Chaohu wetland area atrophy.(3)In 1995~2013,the vegetation coverage area with high coverage decreased,the area of low and medium vegetation and plant cover was degraded.(4)The comprehensive evaluation index(CEI)of ecological environment of Chaohuai Lake in 2005,2005 and 2013 was 0.562,0.555 and 0.540 respectively.The ecological environment of wetland in Chaohu Lake area belonged to Grade 76?,and the pressure of wetland was larger and the structure,Change response and health status was general.Based on the forecasting model of wetland eco-environment comprehensive index CEI in the Chaohu Lake area,the comprehensive evaluation index of wetland eco-environment in the Chaohu Lake area in 2021 is predicted to be0.516,which reflects the decline of the wetland eco-environment index around the Chaohu Lake area with the support of the current protection policy trend,and the ecological environment will continue to deteriorateto 2021. |
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