关键词: 研究进展, 研究进展

Abstract: The dumps formed in the process of mining can cause great damage to ecological environment, human survival and safety. Thus it is very important to rehabilitate vegetation, and improving soil quality is the key to vegetation rehabilitation. The author took a simple and feasible method as entry point, combined indoor potted and field experiment, detected heavy metal content in crop plant and fruit, and used relevant standard as reference frame after analyzing the physicochemical property of local soil and the selected foreign soil. The results showed that soil quality was poor before reclamation in Zhongshan dump and organic matters (S, N, K) were deficient, and heavy metal content seriously exceeded standard. Through indoor potted experiment, quicksand was selected to be foreign soil material which suitable for crop growth. Field test proved that the yield of crops that improved by quicksand was equal or even exceeded that of local land, and soil fertility was increased by certain degree. Soil heavy metal content increased, but they were all within soil environmental quality standards. Hg and Cr slightly exceeded the standard in peanut fruit, while Pb in peanut fruit and Pb, Cr, As in sesame fruit seriously exceeded the standard. It was suggested that the thickness of isolation soil and covering soil should be increased, and crops which have shallow root system should be chosen when improving soil quality with the method of foreign soil covering, while it was wise to choose plants with high heavy metal adsorption capacity for the purpose of reducing soil heavy metal level.