城市污泥对矿区土壤性状的影响

本研究以江西东乡铜矿区土壤为基质,设计了6个不同的污泥施用量的处理进行枸树盆栽试验。结果表明:不同处理下土壤中有机质含量与对照相比增加了32.58%～126.95%,碱解N增幅为77.80%～300.60%,速效P增幅为109.83%～596.41%,铜含量增幅为3.64%～24.41%,铅、锌含量增幅分别为0.53%～7.82%、1.38%～10.39%;与对照相比,细菌数提高了20～232.5倍,真菌数提高了2.28～32.85倍,放线菌数提高了3.5～130倍。根据矿区废弃地和污泥的性质,污泥施用比例为40g/kg时,是提高土壤肥力和改良土壤结构,重金属含量又能控制在土壤标准范围之内的最佳方案。

EFFECTS OF MUNICIPAL SEWAGE SLUDGE ON MINE SOIL PROPERTIES

In this study,a pot experiment of one season growth of was conducted under green house condition with six different sludge treatments using Dongxiang Copper Mine soil.The results showed that compared with the control,organic matter contents in different treatment increased by 32.58%～126.95% ,alkaline hydrolysis nitrogen increased by 77.80%～300.60%,available phosphorus increased by 109.83%～596.41%.Copper content increased by 3.64%～24.41% ,lead,zinc content by 0.53%～7.82% ,1.38%～10.39% ,respectively.Compared with the control,the number of bacteria increased by 20～232.5 times,number of fungi by a 2.28～32.85 times,and actinomycetes by 3.5～130 times.According to the characteristics of mining waste and sludge,we developed an optimal sludge application of 40 g/kg,which can contribute to ecological restoration and improve soil fertility,while the content of heavy metals in the soil is still within the criterion.