硅藻土有机肥对Cd-Zn复合污染土壤重金属形态和有效性的影响  

Effects of Diatomite Organic Fertilizer on Cd and Zn Forms and Availability of Cd-Zn Polluted Soil

作　　者：林汲[1] 程琛[1] 韩明强[1] 李松兴[1] 马晓蕊[1] 李延[1] 

机构地区：[1]福建农林大学资源与环境学院,福建福州350002

出　　处：《农业资源与环境学报》2014年第4期366-371,共6页Journal of Agricultural Resources and Environment

基　　金：福建省自然科学基金项目"畜禽粪便中重金属在土壤-蔬菜系统中的迁移和富集"(2008J0046);福建省大学生创新项目

摘　　要：通过室内土壤培养试验研究硅藻土有机肥对Cd、Zn复合污染土壤重金属形态和有效性的影响。结果表明,添加硅藻土有机肥可提高Cd、Zn复合污染土壤的pH值,降低土壤有效态Cd、Zn的含量。硅藻土有机肥对Cd、Zn复合污染土壤Cd、Zn形态有明显的影响,表现为明显降低土壤交换态、松结有机态Cd、Zn含量,提高紧结有机态和残渣态Cd、Zn含量。相关分析表明,土壤交换态、松结有机态Cd、Zn的含量与土壤有效态Cd、Zn的含量均呈极显著相关,氧化锰结合态Cd与土壤有效态Cd含量显著相关。硅藻土有机肥用量(土壤重量的5%和10%)对土壤有效态Cd、Zn和不同形态Cd、Zn含量无显著差异。An indoor soil cultivation experiment was carried out to study the effects of diatomite organic fertilizer on the forms and the availability of Cd, Zn in soil. The results showed that the soil pH increased, the soil available Cd and Zn reduced after diatomite organic fertilizer application in contaminated soil. Diatomite organic fertilizer application decreased the contents of exchangeable form and weakly-bound-to organic form of Cd and Zn significantly, but increased the contents of strongly-bound-to organic form and residual form of Cd and Zn in contaminated soil. Statistics analysis showed that the contents of exchangeable and weakly-bound-to organic form of Cd and Zn had highly significant relation to the content of soil available Cd and Zn（P〈0.01）. The contents of Mn oxide-occluded Cd had significant relation to the content of soil available Cd（P〈0.05）. Comparing the treatments of diatomite organic fertilizer with the rate of 5%and 10%soil weight, there was no significant difference in soil pH, the contents of soil available Cd, Zn and the forms of Cd, Zn.

关 键 词：Cd-Zn复合污染 硅藻土有机肥 形态 有效性 

分 类 号：X53[环境科学与工程—环境工程]