Assessment for soil improvement benefit of land rehabilitation in dump areas

Land rehabilitation can affect the environment of dump areas prominently. For example, it can improve the chemical properties of the soil in the dump. In order to discover the quantitative relationship between land rehabilitation and soil improvement, firstly, 14 kinds of physical and chemical properties of the soil in dumps are compared and analyzed, such as the soil’s organic matter content, thickness of the soil layer, total nitrogen, available phosphorus, calcium, magnesium, sulphur and boron, rapidly available potassium, iron, copper, zinc and manganese, and pH. Secondly, according to different waste ages and different rehabilitation ages and based on the theory of water and soil conservation and soil science and ecology resumption, the soil improvement benefit of land rehabilitation is studied by using the method of space as a substitute for time. Finally, this paper discusses the soil improvement benefit evaluation system of land rehabilitation in dump areas initially, then builds a soil improvement benefit evaluation model utilizing the gray relational analysis method. This research can provide the necessary test data, scientific basis and evaluation method for land rehabilitation projects in dump areas. The results show that the soil improvement benefit is directly proportional with the different waste ages and the different rehabilitation ages. In addition, human activity is also an important factor for the improvement benefits of land rehabilitation.