河曲露天矿排土场不同复垦区土壤质量评价

Evaluation of soil quality in different reclamation areas of Hequ open-pit mine dump

露天矿开采效率高、成本低、生产安全、经济效益好,但也使得排土场土壤的结构和理化性质受到了影响,导致土壤养分流失,对土地资源造成一定程度的破坏。以河曲露天矿不同排土场土壤为研究对象,基于非线性隶属度函数方法和改进的内梅罗指数评价法,选取了5项养分指标对其土壤肥力质量水平进行综合评价。研究表明,河曲露天矿不同复垦区土壤肥力质量指数排序为4_(下)(0.453)>1号(0.447)>2号(0.402)>3号(0.213)>4_(上)(0.139),即已复垦区的土壤质量水平要高于未复垦区的土壤质量水平;整体来看,土壤质量水平均处于中等偏下和较差水平,主要限制因子是有机质、碱解氮、有效磷,以及土壤酸碱度。本研究结果可为该地区后续土壤改良、提高土壤肥力及土壤可持续利用提供参考。

The open-pit mine has high mining efficiency,low cost,safe production and good economic benefits,but it also affects the structure and physical and chemical properties of the soil in the dump,resulting in the loss of soil nutrients and damage to land resources to a certain extent.Based on the nonlinear membership function method and the improved Nemero index evaluation method,five nutrient indexes were selected to comprehensively evaluate the soil fertility quality of Hequ open-pit mine.The research shows that the soil fertility quality index of different reclamation areas in Hequ open-pit mine is ranked as below 4(0.453)>1(0.447)>2(0.402)>3(0.213)>up 4(0.139),that is,the soil quality level of reclaimed area is higher than that of unreclaimed area.On the whole,the soil quality was at the lower or poor level,and the main limiting factors were organic matter,alkali-hydrolyzed nitrogen,available phosphorus,and soil pH.The results of this study can provide reference for soil improvement,soil fertility improvement and soil sustainable utilization in this area.for soil improvement,soil fertility improvement and soil sustainable utilization in this area.