巢湖流域生态系统健康评价-自然地理学专业论文.docx

Study on Ecosystem Health Assessment of Chaohu Lake Basin Abstract In recent years,combined with the actual characteristics of Chaohu Lake basin and availability in data, The pressure of land (soil reclamation rate , the pressure of population(population disturbance degree, population density), water resource spressure (the intensity of water resources utilization) 、 pollutant discharge pressure(The sewage emission intensity, Ammonia emission intensity、COD emission intensity), average coverage vegetation index,product, quantity of soil conservation, per capita GDP, soil erosion index, the forest coverage rate are selected, A pressure - state - response evaluation index system of ecological system health is established; Taking cities and counties in Chaohu River Basin as evaluation unit, Ecosystem health assessment of Chaohu Lake Basin in 2010 is better, Ecosystem health level for the evaluation of excellent and poor unit is 1,occupy for 11.11% in the total; The number of better and worse unit is 1,which accounted for 11.11% of the total; The number of general unit is 4,which accounted for 11.11% in the total;Shucheng County belongs to the first-level district which is in excellent healthy condiiton ;Chaohu city and Wuwei county and Hanshan county belong to the second-level district which are in better healthy condition; Feidong count and Hexian county and Hanshan county belong to the third-level district which are in general healthy condition;Hefei city belongs to the fourth-level district which is in worse healthy condition. while Shucheng county is mountainous area in the southwest of Chaohu Lake basin , whose economy is backward and population density is lower interference activity is less,so the ecosystem health condition is best. From 2000 to 2010，the evaluation units whose health condition of ecological system get better are Feidong county、Chaohu city、Lujiang county、Hanshan county、Hexian county、