草原区露天煤矿排土场复垦土壤质量演替规律与模型

土壤质量变化是衡量排土场复垦土壤生产力大小和土壤环境质量优劣的量度。该文通过典型小区调查的方法,总结了内蒙古伊敏矿区排土场不同复垦年限土壤质量(体积质量、有机质、有效磷、速效钾、全氮、碱解氮、pH值、电导率)的动态演变规律,并运用指数和法构建了研究区土壤演替模型。结果表明:研究区土壤中有机质、速效钾、全氮、碱解氮的含量均呈递增趋势,土壤质量逐渐接近原地貌含量。运用指数和法得出的土壤演替模型表明研究区土壤质量状况已得到改善,逐渐接近原地貌土壤质量。该研究可为草原生态脆弱矿区露天矿排土场土地复垦与生态恢复提供理论依据。

Succession law and model of reclaimed soil quality of opencast coal mine dump in grassland

Soil quality change is to measure soil productivity level and soil environmental quality. The dynamic succession law of Inner Mongolia mining waste dump reclaimed soil quality (Soil bulk density, Organic matter, Available P, Available K, Total N, Alkali Hydrolysable N, pH value, Electrical Conductivity) were summarized through the typical residential survey in this paper, and soil succession model of the study area were constructed by using indexes sum method. Results showed that the Organic matter, Available P, Available K, Total N, Alkali Hydrolysable N content in study area soil increased and all the soil quality gradually closed to its content in original landform. Soil succession model using indexes sum method showed study area already improved soil quality status, and gradually closed to the original landform soil quality. This study provides the theoretical basis for land reclamation and ecological restoration in ecological fragile mining area of opencast dump.