Ecological Vulnerability Assessment Of Mining Area In Changhe Watershed,Jincheng

The Changhe river basin is a typical loess hilly area,which belongs to the Jincheng city of southeastern Shanxi.It is the coal base of Shanxi and i rich in coal resources.In the past more than 20 years,with the rapid development of economy,resource demand is increasing,long time and large scale coal mining provides a guarantee for the social economic and energy security,but on the other hand,,the river basin ecological diversity,water resources and ecological stability faced serious damage,the environment was the contradiction to ecological fragile in loess hilly region is more prominentThe ecological environment is the foundation of human survival and development.The excessive consumption of resources and the continuous increase of population make human ecological environment more fragile.Therefore,the ecological vulnerability has become an urgent problem to be studied.The study of ecological vulnerability in mining area is the basis for solving the hidden danger problem of ecological environment safety and sustainable development in coal mining area,and is the key to the rational utilization of coal land water resources in mining area.The study on the ecological vulnerability of the mining area in Changhe basin is of great significance to the ecological protection,governance and policy analysis and formulation of the mining areaIn this paper,the river basin in Jincheng city as the study area of 108 square kilometers,and combined with the characteristics of ecological system in loess hilly area of vulnerability theory,the establishment of ecological vulnerability evaluation system in loess hilly region,and the set pair analysis method for the comprehensive evaluation on them,and then use factor analysis method to get the frangibility of ecosystem causes and the main driving factors,finally,now the ecological condition of the study area,study on ecological system reconstruction,provide the basis for the study area of ecological improvement.The main conclusions are as follows(1)In this paper,the ecological environment,natural resources,social and economic sustainability of the four systems,with the objective and scientific,integrity,dynamic and dominant five principles,with reference to the Zezhou county planning and consulting expert opinions after reasonable selection of building vulnerability evaluation index system of 16 indicators.The AHP method is used to measure the weight of the index.(2)In the fragile ecological environment on the basis of the formation of long-term social activities,so in order to keep the certainty of 2007,2009,2011,2013,2015,five years of ecological vulnerability evaluation,the results showed that:in 2007 and 2009 in the study area fragile level is IV,the strong weak and fragile in 2013 2011;grade III,which is fragile;2015 vulnerability level is II,which is slightly fragile The results are reliable by using the ecological vulnerability formula.(3)Based on the evaluation results of vulnerability degree of mining area,the estimated factor is transformed into 20 single factor index system,and the cause of vulnerability in the study area is quantitatively obtained by factor judgement.It is found that environment,economy and population are the three main driving forces for vulnerability of mining area.The contribution rates were 51.437%,24.434%and 10.478%respectively,and the total contribution rate reached 86.358%.The conclusion is that the first driving force is the result of environmental destruction caused by social activities such as coal mining(4)based on the analysis of the causes of vulnerability in the study area,combined with the current ecological situation,we will carry out ecological reconstruction from three aspects:ecological planning,ecological restoration,and ecological reconstruction measures.