The power of human activities in resource鄄based cities overload its ecological carrying capacity, such as mining, land occupying, and ore smelting supported by resources and environment. The relative research on the development of the cities is a hot topic over the world, the sustainable development of resource鄄based cities has become one of most prominent issues in China. The ecological carrying capacity reflects the harmony of human and ecosystem, including their interactive and symbiotic relationship, which should be used as an important criterion of region sustainable development. In past, the studies on ecological carrying capacity were largely confined to basin and region scales until the urban complex ecosystem theory was put forward. Thereby it is very inevitable to study the urban ecological carrying capacity and eco鄄regulation for its sustainable development. Tangshan, nearly hundred years of mining history, may be one of the fastest developing resource鄄 based cities in China, as well as one of most prominent representative of the cities which has poignant contradiction of the location: population boom, resources depression and environment deterioration. Based on the regional unique characteristics
Open鄄pit coal mining causes rock mass peeling, vegetation damage and of phy鄄chemical properties change of soil. Severe disturbance makes soil system in mining area the main receptor of soil erosion, landslide and other potential ecological risks. In this study,soil ecosystem of Pingzhuang western open鄄pit coal mining area in Inner Mongolia was the research object. To find the distribution and changes of ecological fragility, the main phy鄄chemical properties of soil,the vegetation succession and the characteristics of soil nematode community structure in mining area were analyzed on landscape units. The results indicate the relevance between maturity and stability of soil systems and their lives. Compared with the agro鄄ecosystem and natural ecosystem undisturbed, however, mining areas and dumping sites have poor soil structure, low soil fertility and less maturity and stability of animal and plant communities. Due to the restriction factors such as soil nutrient condition and microbial quantity,natural recovery of vegetation in mining area is slow and the ecosystem is fragile. Soil reformation,plants selection and nutrient conditions improvement should be suitable to reconstruct vegetation.
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