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以堆肥污泥为研究对象,采用盆栽实验方法研究不同干质量(0%、1%、5%、10%、25%和50%)堆肥污泥施入贫瘠黄土后,对玉米、蚕豆生长情况及对重金属Cd吸收的影响。结果表明,黄土中重金属Cd含量随施用堆肥污泥增加而增加,大部分(70%以上)都积累于混合基质中,玉米和蚕豆中重金属Cd吸收系数约为0.09~0.14;施用堆肥污泥干质量超过25%时,混合基质中重金属Cd超过《土壤环境质量标准》(GB15618-1995)[1]二级(pH>7.5)标准值(0.6 mg/kg),另外,玉米和蚕豆在堆肥污泥施用比例分别为1%和5%时长势最佳,且植物幼苗期平均增重分别为8%和19%,得出,施入5%左右堆肥污泥有利于玉米、蚕豆生长,堆肥污泥短期有控施于贫瘠黄土是可行的。
Taking compost sludge as the research object, pot experiment was conducted to study the growth of maize and broad bean after applying different concentrations of compost sludge (0%, 1%, 5%, 10%, 25% and 50% And the impact of heavy metal Cd absorption. The results showed that the content of heavy metal Cd in loess increased with the increase of applied compost sludge, most of which (70%) accumulated in the mixed matrix. The Cd absorption coefficient of heavy metals in corn and broad bean was about 0.09 ~ 0.14. When the mass exceeds 25%, the Cd in the mixed matrix exceeds the standard value (0.6 mg / kg) of Grade II (pH> 7.5) of Soil Environmental Quality Standard (GB15618-1995) [1]. In addition, The best growth rate was obtained when the proportion of mud was 1% and 5%, respectively, and the average weight gain was 8% and 19% at the seedling stage respectively. It was concluded that the application of about 5% compost sludge was beneficial to the growth of corn and broad beans, It is feasible for mud to be applied to barren loess in the short term.