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赤子爱胜蚓对3种污染土壤中Zn及Pb的活化机理研究

成杰民 解敏丽 朱宇恩

成杰民, 解敏丽, 朱宇恩. 赤子爱胜蚓对3种污染土壤中Zn及Pb的活化机理研究[J]. 环境科学研究, 2008, 21(5): 91-97.
引用本文: 成杰民, 解敏丽, 朱宇恩. 赤子爱胜蚓对3种污染土壤中Zn及Pb的活化机理研究[J]. 环境科学研究, 2008, 21(5): 91-97.
CHENG Jie-min, XIE Min-li, ZHU Yu-en. Mechanism of Mobilization Zn and Pb by Earthworm (Eisenia foetida) in Three Soils[J]. Research of Environmental Sciences, 2008, 21(5): 91-97.
Citation: CHENG Jie-min, XIE Min-li, ZHU Yu-en. Mechanism of Mobilization Zn and Pb by Earthworm (Eisenia foetida) in Three Soils[J]. Research of Environmental Sciences, 2008, 21(5): 91-97.

赤子爱胜蚓对3种污染土壤中Zn及Pb的活化机理研究

基金项目: 国家自然科学基金项目(D40271068);山东省自然科学基金项目(Y2002E02)

Mechanism of Mobilization Zn and Pb by Earthworm (Eisenia foetida) in Three Soils

  • 摘要: 以褐土、潮棕壤和酸性棕壤为供试土壤,分别加入100,200和400 mg/kg的w(Zn)或200,400和800 mg/kg的w(Pb)用于模拟污染土壤,通过培养试验,研究了赤子爱胜蚓(Eisenia foetida)对3种土壤中Zn及Pb的活化机理.结果表明:蚯蚓活动显著提高了酸性棕壤和潮棕壤中Zn及Pb处理和褐土中Pb处理的pH;显著降低了褐土中添加w(Zn)为100和200 mg/kg 处理的pH.蚯蚓活动显著提高3种土壤中w(DOC).蚯蚓活动显著提高了潮棕壤中DTPA提取态w(Pb)〔DTPA-w(Pb)〕,对DTPA提取态w(Zn)〔DTPA-w(Zn)〕的影响不大;显著提高了酸性棕壤分别添加w(Zn)及w(Pb)为200和400 mg/kg处理中土壤DTPA-w(Zn)及DTPA-w(Pb);对褐土添加w(Zn)低于400mg/kg和添加w(Pb)低于800 mg/kg的处理中DTPA-w(Zn)及DTPA-w(Pb)的影响不明显.蚯蚓粪中DTPA-w(Zn)及DTPA-w(Pb)显著高于土壤,Zn的活化率在52%以上,Pb的活化率在47%以上;而土壤中Zn的活化率低于8%,Pb的活化率低于23%.3种供试土壤中DTPA-w(Zn)及DTPA-w(Pb)与土壤pH均呈线性负相关关系,与土壤w(DOC)和蚯蚓粪中DTPA-w(Zn)及DTPA-w(Pb)均呈线性正相关关系.蚯蚓通过肠道消化和养分富集提高土壤中Zn及Pb的活性,是提高土壤中重金属生物有效性的重要机制之一.

     

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出版历程
  • 收稿日期:  2008-04-21
  • 修回日期:  2008-06-19
  • 刊出日期:  2008-10-25

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