连续污泥农用对土壤微团聚体及有机质组分中重金属分布的影响  

Effects of Continuous Application of Sewage Sludge Fertilizer on Heavy Metal Distribution in Soil Micro-aggregate and Organic Matter

作　　者：李云峰[1,2] 周通[2] 商照聪[1] 程苗苗[2] 杨璐[2] 李柱[2] 骆永明[2] 吴龙华[2] 

机构地区：[1]上海化工研究院,上海200062 [2]中国科学院土壤环境与污染修复重点实验室(南京土壤研究所),南京210008

出　　处：《土壤》2015年第5期953-959,共7页Soils

基　　金：国家高技术研究发展计划(863)课题(2012AA101402-2);国家自然科学基金项目(41325003)资助

摘　　要：采用物理和化学相结合的分组方法,将土壤逐级分离成不同粒径后再分出以有机无机复合体存在的重组,研究施加不同污泥后土壤中不同粒径颗粒、不同重组结合态腐殖质组分中Cu、Zn、Cd的分配特征。结果表明:土壤重金属浓度随其粒径减小呈不断升高趋势,但施用污泥增加了土壤细砂粒级组分中的重金属比例,且随施用污泥中重金属浓度上升而增加。施加污泥后,不同粒径土壤颗粒中松结态腐殖质比例明显增加,紧结态腐殖质所占比例下降。施加污泥后土壤细砂颗粒松结态腐殖质中Cu、Zn、Cd所占比例上升,紧结态腐殖质中Cu、Zn、Cd比例下降。粉砂粒级松结态腐殖质中Cu、Cd比例上升,紧结态腐殖质中Cu、Cd比例下降。细粉砂和胶体粒级不同结合态腐殖质中Cu、Zn、Cd比例没有明显变化。不同粒径组分土壤颗粒中重金属比例变化不仅与不同结合态腐殖质的比例有关,还与土壤颗粒大小和土壤性质有关。Soil was progressively separated into different particle sizes and into heavy fractions of organic mineral complex by using combination physic-chemical methods. The distribution characteristics of copper （Cu）, zinc （Zn） and cadmium （Cd） combined in the different humus fractions and different particle fractions were determined after the application of sewage sludge fertilizers （SSF）. The results showed that soil heavy metal concentrations increased with the particle size decrease, but application of SSF increased the proportion of heavy metals in fine particle, whose content increased as the concentration of heavy metal in sludge increased. SSF allocation increased the proportion of loosely combined humus in different particles, while declining the tightly combined humus. SSF addition increased the proportion of Cu, Zn and Cd in loosely combined humus of fine particles, while decreasing the proportion of those metallic elements in tightly combined humus. In the silt fraction, the proportion of Cu and Cd in loosely combined humus was increased while those metallic elements＇ proportion in tightly combined humus was declined. The proportion of Cu, Zn and Cd of variously combined humus in both fine silt sand and colloidal particles did not change significantly. The proportion of heavy metals was correlated with the proportion of different combined humus.

关 键 词：污泥 土壤 重金属 粒径分级 结合态腐殖质 

分 类 号：X53[环境科学与工程—环境工程]