Abstract: To scientifically determine the cost of eco-environmental damage is a focus and difficult issue in researches of ecological compensation. In this paper we take the transformation of paddy field into dry land (a pattern of land degradation caused by coal mine collapse) as research object, and analyse the changes of water factors (in terms of water cycle and eco-protection) from paddy field to dry land through literature review and household survey. On this basis, we introduce the concept of virtual water trade to determine the feasibility of eco-compensation standard for paddy field transferring into dry land. This research could be a reference for the eco-compensation mechanism and decision-making in coal mining collapse areas.

Key words: Karst, soil water resources, virtual water, ecological compensation, soil and water conservation