Variance of reclamation soil quality in Majiata opencast mine region

Taking Majiata opencast mine as an example, select nine indicators such as soil organic matter, total N, available P, available K, pH value, moisture, compaction, bulk density and the EC to evaluated reclaimed soil quality. Weight values of each index were calculated with the method of correlation coefficient. According to membership function curve, the subjection degree was calculated, and soil quality was evaluated with integrated method finally. According to soil reclamation periods, those were divided into five reclamation periods in the study area, and five years reclamation land was subdivided six districts by different vegetation types. Soil samples were collected at five separate levels (0-7.62 cm, 7.62-15.24 cm, 15.24-22.86 cm, 22.86-30.48 cm, 30.48-38.1 cm) in every district. The results show that the surface soil quality is continually raising with the reclamation years increase, and is higher than the lower layer quality. Reclaimed soil quality has great difference at different vegetation types, soil quality of grass, poplar are better, and farmland and conifers are the worst.