Effects of regenerated periods and vegetation modes on soil quality in regenerated land of opencast coal mine

Understanding the effect of regenerated duration and measures on the soil quality is essential for estimating the degree of ecological restoration.In this paper, we employ the correlation coefficient and empirical model to determines the index weight and membership degree, and the mathematical model by indexes sum method is built up to evaluate the restoration effects of different regeneration periods and vegetation patterns on the soil quality in restoration fields of the Antaibao opencast coal mine.The results show that the processes of opencast coal mining were lead to huge damages on the topsoil.With the implementation of the artificial regenerated measures, the soil quality had already recovered and gradually closed/exceed to the original landform.However, it would be a long time for soil quality to recover, and regenerated measures and periods are important for its recovery.Secondly, from the standpoint of the soil quality, the best single-plant reclamation pattern is exhibited by Chinese pine (Pinus tabulaeformis), and the optimized configuration sequence of mixed forest is Locust (Robinia pseudoacacia)×Elm (Ulmus pumila).The latter reclamation mode can be used preferentially in the study area.These findings are in a hope of providing theoretical reference for the land reclamation, ecological reconstruction in open coal mines.