【摘要】 为治理镉砷复合污染农田土壤,选取了湖南省某矿区附近的镉砷复合污染稻田,以小区对比试验研究了复合土壤修复剂(亚硒酸钠+钙镁硅肥+聚合硫酸铁+膨润土+硫磺+氯化钙)对土壤中镉(Cd)、砷(As)有效态、土壤pH,稻谷中Cd、As含量及稻谷产量等指标的影响。结果表明,在2 700 kg/hm~2施用水平,施用土壤修复剂能提高土壤pH 0.4单位,土壤CEC增加9.23 cmol/kg,有机质增加14.32 g/kg;施用土壤修复剂土壤有效态镉、有效态砷含量分别降低41.93%、64.34%,稻米中镉、无机砷含量分别降低81.25%、77.92%,达到国家食品污染物限量标准;同时,施用土壤修复剂能在一定程度上提高稻谷的长势及产量,稻谷产量增加6.82%。更多还原

【Abstract】 In order to remediate soil contaminated by cadmium-arsenic,paddy soil near a mining area in Hunan Province was selected. It was investigated for remediation effect of the composite soil repairing agent(sodium nitrite+ calcium and magnesium silicon fertilize+ polyferric sulfate+ bentonite+ brim stone+ calcium chloride)on bioavailable cadmium and arsenic in soil, soil pH, cadmium and arsenic contents in rice, rice yield and other indexes. The results showed that, under 2 700 kg/hm~2 restoration agents,soil pH values increased by 0.4 units, soil CEC increased by 9.23 cmol/kg, organic matter increased by 14.32 g/kg, the contents of available cadmium and available arsenic in soil decreased by 41.93% and 64.34%.The content of arsenic and inorganic arsenic in rice grain decreased by 81.25% and 77.92%, respectively, which achieved the national food pollutant limit standard;at the same time, the application of soil restoration agent can improve rice growth and yield to a certain extent, and the rice yield increased by 6.82%.更多还原