堆肥污泥施入黄土对植物生长及Cd吸收的影响  

Impact of composted sludge into loess on plant growth and Cd uptake of heavy metals test

作　　者：曾正中[1] 高冬香[1] 苟剑锋[1] 张敏[1] 李国梁[1] 王厚成[1] 南忠仁[1] 

机构地区：[1]兰州大学资源环境学院甘肃省环境污染预警与控制重点实验室,兰州730000

出　　处：《环境工程学报》2015年第8期3985-3990,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(NSFC 51178209)

摘　　要：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.This study centers on composted sludge and the method of pot experiment was adopted to explore the influence on the growth of maize, beans and the absorption of heavy metal Cd with composted sludge of differ- ent dry weights in 0% , 1% ,5% ,10% ,25% ,50% , respectively. The result indicated that Cd content of loess kept pace with the increase of composted sludge. The majority of Cd （over 70% ） was accumulated in the mixing matrix, and the absorption coefficient of Cd in maize and beans was about 0.09～ 0.14. Once the dry weight of composted sludge exceeded 25% , Cd content in the mixing matrix would be above the secondary standard（ pH 〉7.5, 0.6 mg/kg） set by the Environmental Quality Standard for Soils （GB15618-1995）. In addition, maize and beans had an optimal growth under the composted sludge content in 1% and 5% , respectively, with an aver- age increased about 0. 8% and 19% in plant seedling period weight. Therefore, 5% of composted sludge is ben- eficial to the growth of maize and beans and composting sludge fertilization is feasible for infertility loess in short- term control.

关 键 词：堆肥污泥 黄土 重金属 植物 

分 类 号：X705[环境科学与工程—环境工程]