土壤调理剂与狼尾草联合修复废弃稀土矿区尾砂土壤研究

A Study of the Effects of Soil Conditioner and Pennisetum alopecuroides on Repair on Tailings Soil in Abandoned Rare Earth Mining Area

研究土壤调理剂与狼尾草联合修复废弃稀土矿区尾砂土壤,为江西废弃稀土矿区尾砂治理提供技术支撑。以赣州市寻乌县文峰乡上甲村典型的废弃稀土矿区尾砂土壤为研究对象,通过施用土壤调理剂和种植狼尾草联合修复尾砂土壤,分析对照区和修复1年、2年和4年后尾砂土壤理化性质及狼尾草生物量。结果表明,与对照相比,增施土壤调理剂和种植狼尾草修复尾砂土壤1~4年后,尾砂土壤容重降幅4.90%~20.98%,土壤总孔隙度和最大持水量增幅分别为4.96%~16.89%和28.78%~47.51%;pH值增幅为11.87%~25.11%;土壤有机质、碱解氮、有效磷和速效钾养分含量以及CEC增幅分别为10.45%~85.70%、47.57%~138.83%、39.56%~135.16%、23.08%~146.15%和32.25%~72.78%。狼尾草干物质质量显著高于对照。施用土壤调理剂和种植狼尾草对修复稀土矿区尾砂土壤具有显著的效果。

The effects of soil conditioner and planting Pennisetum alopecurides on repair on tailings soil in abandoned rare earth mining area were studied,providing technical guidance for the treatment of waste rare earth mine tailings in Jiangxi Province.The tailings soil from a typical abandoned rare earth mining area in Shangjia Village,Wenfeng Township,Xunwu County of Ganzhou was taken as the research object,and the changes in the physical and chemical properties of the tailings soil and the biomass of Pennisetum alopecurides 1,2 and 4 years after repair with soil modifier and Pennisetum alopecurides in the control area and the repaired area were analyzed.The results showed that,compared with the treatment with no soil conditioner,the bulk density of tailings soil decreased by 4.90%~20.98% 1 to 4 years after application of soil conditioner and planting Pennisetum alopecurides,and the total porosity and maximum moisture capacity increased by 4.96%~16.89% and 28.78%~47.51%,respectively.The pH value increased by 11.87%~25.11%;the contents of soil organic matter,alkali-hydrolyzed nitrogen,available phosphorus,available potassium,and CEC increased by 10.45%~85.70%,47.57%~138.83%,39.56%~135.16%,23.08%~146.15%,32.25%~72.78%,respectively.The dry matter yield of Pennisetum alopecurides was significantly higher than that of the treatment with no soil modifier.The treatment with soil conditioner and planting Pennisetum alopecurides had significant effects on repair on tailings soil in abandoned rare earth mining area.