Study On The Application And Evaluation Of The New Reclaiming Substrate For Coal Mine Subsided Land

Mining subsidence land is the large size and scale destructive land in China,it is very typical in world. Nowadays, the filling with covered soil is the main method to reclaim the subsided land, which has made some benefits. However, the land subsidence is often on a large scale, and there is not enough soil to utilize around the subsided land, and it is expensive for using outside soil. The lack of covered soil is becoming the main problem in land reclamation. The conflict among the population and resource and environment is becoming more and more acute, it has become a subject staring us how to find a new reclaiming substrate to widen the cultivated land and promote the sustainable land use in subsidence land.Some related studies have made substrates compositive of fly ash and furfural residue, sewage sludge, distillers'grains and which will to be used in reclaiming the subsidence land. But the substrates were not the soil in theory,they will need a long-term further research in physical and chemical characters and environment effect.Through investigating the growing situations of the plants in the new substrates, the study analyzed the biological effect and environmental effect of planting, and discussed the feasibility of the substrates using in reclamation, and chose the plants applied. A comprehensive assessment model of the substrates quality was established,the restriction degree of the substrates quality for plants growth was also evaluated.The conclusions was that: (1) It had gotten preferable biological effect of planting on substrates: the emergence rate of each plant in substrate 1 (fly ash and furfural residue), substrate 2(fly ash and sewage sludge), substrate 3(fly ash and distillers'grains) was higher than that of control plant; the plant height...