Assessment Of Ecological Fragility In Yushenfu Mining

Yushenfu mining area,which is rich in coal resources, has become a large coal development base in China. Numerous ecological and environmental problems are arisen since it is located in the pastoral areas of northern China and the transition zone of desert and the Loess Plateau, such as the serious desertification and soil erosion, and a series of new environmental problems from coal mining. Investigating the causes of the fragility in Yushenfu mining area has great significance in implementing the strategy of sustainable development, as well as improving of the ecological environment in Yulin.Based on the survey Yushenfu mining area and the theory of ecological fragility, a evaluation system of ecological vulnerability for mine was set up. SPA(set pair analysis) was used to evaluat the ecological fragility. Finally, using factor analysis, 25 factors of 10 years were chose to find the main driving force of fragile environment in Yushenfu mining. The main conclusions are as follows:⑴Divided the ecological system of Yushenfu mining into 4 subsystem: ecological environment, natural resources, socio-economic and sustainability, then got the 13 indicatores which were suitable for evaluating the ecological fragility. The weight of the indicators were selected by AHP. Then, reference to the regional planning of Yulin City and the experts'opinion, the standards of ecological vulnerability assessment in Yushenfu mine were made.⑵Since the uncertainty point of ecological fragility, the ten straight years'ecological fragility of Yushenfu mine area were evaluated by set pair analysis, the results showed that: Yushenfu mining's ecological fragulity level was V in 1998, that was very fragile; from 1999 to 2003 were IV, that was strong fragile; from 2004 to 2007 were III, that was fragile. Then verify the results using the formula which has been confirmde, the rusults were basically same. That is, the ecological environment of this area was gradually improving.⑶Change the composite index of the ecological fragility evalution in Yushenfu mining into the 25 single-factor indicators. The three major driving forces were quantitative got by using of factor analysis: environmental background driving force, population carrying driving force and economic development driving force. The respective contribution rate were 52.036%, 20.928% and 16.792 %, and the cumulative contribution rate is 89.757%. It indicated that the cause of the ecological fragile in Yushenfu mining was mainly natural factors, but human activities could affect the development.