强还原过程对设施菜地土壤重金属形态转化的影响

发布时间：2018-01-19 15:14

本文关键词： 设施菜地强还原重金属形态转化　出处：《应用生态学报》2017年11期 　论文类型：期刊论文

【摘要】：设施菜地由于污水灌溉、粪肥施用等导致重金属污染.本文通过土柱淹水同时添加玉米秸秆培养和后期通水淋洗,研究强还原法对设施土壤重金属(Cd、Cu、Pb和Zn)形态转化的影响.结果表明:强还原处理使土壤p H显著降低,玉米秸秆处理变化更显著;土壤氧化还原电位(Eh)迅速下降至-280 m V左右.玉米秸秆处理可以促进土壤中Cd、Cu、Pb和Zn活化,第9天土壤中有机物及硫化物结合态和残渣态Cd、Cu、Pb和Zn含量比重下降;至15 d培养结束,土壤中4种重金属含量较对照分别减少18.1%、19.0%、16.1%和15.7%.玉米秸秆处理可以增加土壤中Cd和Zn的溶出量,但是Cu的溶出量减少;胶体结合态Cd和Pb含量较对照增加、Cu较对照显著减少、Zn没有显著变化.强还原可以引起设施土壤重金属活化,提高蔬菜积累重金属的风险,而且其随土壤水分的运移可能导致水体的污染.
[Abstract]:Heavy metal pollution was caused by sewage irrigation, manure application and so on. In this paper, the heavy metal CD in the facility soil was studied by means of soil column flooding and corn straw culture and water leaching in the later stage. The results showed that the soil pH was significantly decreased by strong reduction treatment, and the change of maize straw treatment was more significant. Soil redox potential (Eh) decreased rapidly to about -280 MV, and maize straw treatment could promote the activation of Pb and Zn in soil. On the 9th day, the specific gravity of Pb and Zn in the soil of the organic matter and sulphide bound state and the residual form of CD _ (2 +) Cu ~ (2 +) was decreased. At the end of 15 days, the contents of four heavy metals in soil decreased by 18.1and 19.0% respectively compared with the control. 16.1% and 15.7. the amount of CD and Zn in soil was increased by maize straw treatment, but the amount of Cu was decreased. The contents of CD and Pb in colloidal bound soil increased compared with the control, and the content of Cu decreased significantly compared with that of the control. The strong reduction caused the activation of heavy metals in greenhouse soil and increased the risk of accumulation of heavy metals in vegetables. And its migration with soil moisture may lead to water pollution.
【作者单位】：中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室;中国科学院大学;
【基金】：国家水体污染控制与治理科技重大专项(2015ZX07202-012) 天津市水资源与水环境重点实验室开放基金资助~~
【分类号】：X53
【正文快照】： 本文由国家水体污染控制与治理科技重大专项(2015ZX07202-012)和天津市水资源与水环境重点实验室开放基金资助This work wassupported by Major Project of the National Water Pollution Control andTreatment Science and Technology(2015ZX07202-012)and the OpeningFund o

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