Impact Of Mining On Ecosystem Health In Loess Plateau

With the rapid development of social economy,the exploitation and utilization of mineral resources worsen the ecological environment which aroused people’s attention.The ecological system can provide living space and food for human whose health status directly or indirectly affect survival and development of human and animals and regional sustainable development.Therefore,the evaluation of ecosystem health has become one of the hot issues to be studied urgently.Based on the theory of ecosystem health and natural-social characteristics of loess hilly region,the RS,GIS,entropy and AHP methods were adopted to construct the evaluation index system of ecosystem health by selecting 18 indexes from aspects of physiographic,water resources condition,effect of coal mining and social ecological environment.The study area was divided into 100m*100m grid as evaluation unit,a total of 1132.According to the composite-index assessment method,the effect of coal mining on ecosystem health in Changhe Basin of Jincheng City was quantified.The final evaluation results were obtained by using the function of GIS for map layers piling,which helped analyze the reasons of different spatial distribution.The global and local spatial autocorrelation were used to study the spatial characteristics of health status including similarity and differences in Changhe Basin.The results show:(1)Western Changhe Basin is greatly affected by coal mining and the health condition of the ecological system in disturbed zone is poor,in which the disease and general ill area accounted for 45.7%of the entire basin.In the east part of the Changhe Basin,the vegetation coverage is high and the ecosystem health statue is better in which the health and above health statues accounted for 19.2%.The sub-health areas are mainly distributed in the two sides of the river,accounting for 35.1%.Coal mining has a great effect on the health of ecosystem in Changhe Basin and most study areas are in sub-health and below sub-health levels.(2)The river basin ecosystem health statues present spatial agglomeration,in which high accumulation distributes in the eastern edge of basin,low accumulation subsidence distributes in the western areas with great land damages.The results can provide some reference for the comprehensive regulation of land in Changhe Basin.