Research On Construction Of Ecological Security Pattern In Mining Cities With Ecological Supply And Demand

The rapid development of the economy and society and the advancement of urbanization have made the originally fragile ecological environment worse.Defined as a mining citiy,Daye city have more ecological security threats and risks,and constructing an ecological security pattern is an effective way to achieve regional ecological security.This paper construct an ecological security pattern that takes into account the supply of ecosystem services and human needs through source-corridor model,which make up for the shortage about single kind of source areas and lacking of construction in corridors.According to the whole demand of all population in Daye and the daily demand of some nearby people,the ecological source areas are divided into two types:global source and local source,which are identified by direct picking and comprehensive evaluation respectively.So the ecological source identification model is consisted of human need(expressed as convenience and people's need of the patch)and ecological supply(expressed as importance and connectivity of the patch).The ecological corridors are divided into three types according to visual interpretation,network analyse,minimum cumulative resistance(MCR)model and classification of ecological sources.They are key corridors,connective corridors and group corridors.The results show that the area of the global and local source areas of Daye City is144.61 km~2 and 197.42 km~2 respectively,and the local source areas can be divided into 6 groups.The northwest water-land group with small patches is easily affected by external disturbances,while the eastern foothill group that located around the central city may be affected by urbanization.The lengths of key corridors,connective corridors and group corridors in Daye City are 112.30km,179.45km and 444.19km respectively.Some of the key corridors are affected by urban construction,mining activities or geological disasters,and the local resistance is high,which need to be dredged and protected in the future planning and development.The ecological security pattern of Daye City consisting of two kinds of source areas and three levels of corridors can not only reflect the status and role of different source areas in the regional ecological security pattern,but also reflect the relative and hierarchical nature of the source areas.The construction of regional corridors provides an analytical framework and new ideas from macro to micro,from whole to local.