土壤改良剂对赣南废弃稀土尾矿的改良效应

Effect of soil ameliorants on abandoned rare mine tailing in Jiangxi province

采用海泡石、鸡粪、腐植酸和生物炭对江西废弃稀土尾矿土进行土壤改良,采用正交实验筛选土壤改良剂配比方案。结果表明,鸡粪、腐植酸和生物炭3种改良剂对黑麦草生物量、土壤有机质、土壤碱解氮、土壤有效磷改良效果明显,海泡石对土壤pH改良效果明显,各处理间差异显著。各改良剂对尾矿土养分状况的贡献值存在差异,筛选出最佳改良方案为海泡石5+鸡粪3+腐植酸2+生物炭2(g/kg)。

The present study analyzed the improved biochemical properties of the abandoned rare earth mining soil in the Jiangxi using four factors of a four level orthogonal variance analysis. Four kinds of ameliorants,including sea foam,chicken manure,humic acid and biochar,were applied with different formulas. The results indicated that the effect of chicken manure,humic acid and biochar on perennial ryegrass biomass,soil organic matter,soil alkaline hydrolysis,soil available phosphorus showed significant( P < 0. 05) differences among the treatments with improvement; and the effect of the sea foam on soil p H showed significant( P < 0. 05) differences among the treatments with improvement. Signficantly higher indicator than the control group were also observed. The contribution of the each amendment of tailings soil nutrient status differences. Considering the results,the most efficient formula for perennial ryegrass biomass,soil organic matter,soil alkaline hydrolysis,soil available phosphorus and soil pH was A_4B_3C_3D_3,that is sea-foam 5 + chicken manure 3 + humic acid 2 + biochar 2( g/kg).