马家塔露天矿区复垦土壤质量变化

以神东公司马家塔露天矿为例,选择土壤有机质、全N、有效P、速效K、pH值、含水率、紧实度、容重和EC9项指标对复垦土壤质量进行了综合评价。研究采用相关系数法确定指标权重,以隶属度函数对指标进行标准化处理,最后采用指数和法评定土壤质量。在研究区划分了5个复垦年限,并且在复垦5a的土地上采集了6种不同植被类型的土壤样品,分5个层次分别进行评价土壤质量。结果显示:随着复垦年限的增加表层土壤质量不断提高,并且表层高于下层;复垦后种植不同植被土壤质量差异较大,种植牧草、杨树较好,耕地和针叶树较差。

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.