摘要
[目的]为探讨蚯蚓对铅污染土壤的修复作用。[方法]通过网室盆栽试验,将蚯蚓放入不同浓度(0、100、300、500、1000mg/kg)铅污染的土壤中,研究蚯蚓对土壤pH值、有机质含量以及阳离子交换量(CEC))的影响。[结果]当土壤铅浓度为0～300mg/kg时,加入蚯蚓提高了土壤的pH值。当铅浓度为500mg/kg时,加入蚯蚓降低土壤pH值,有利于植物吸收富集铅。当铅浓度为0、100、300、500mg/kg时,加入蚯蚓能提高土壤CEC,其增幅在无污染土壤中最大。随着铅浓度的增加,土壤有机质含量增加,加入蚯蚓后土壤有机质含量总体上呈增加趋势。当铅浓度为1000mg/kg时,加入蚯蚓对铅污染土壤的化学性质没有影响。[结论]在铅浓度为0～100mg/kg的土壤中,加入蚯蚓可减少作物对铅的吸收,增加作物的产量;在铅浓度为500mg/kg的土壤中,加入蚯蚓可提高植物的修复效率。
[Objective] The research aimed to discuss the repairing effects of earthworm on Pb-polluted soil. [Method]In pot experiment in net room, earthworms were put into the soils polluted with different concentrations （0, 100, 300, 500, 1 000 mg/kg）of Pb to study the effects of earthworm on pH value, organic matter content and cation exchange capacity（CEC） in the soil. [Result] When Pb in the soil was at 0-300 mg/kg, adding earthworms increased soil pH value. When Pb was at 500 mg/kg, adding earthworms decreased soil pH value, which was favorable for Pb absorption and enrichment in plants. When Pb was at 0, 100, 300, 500 mg/kg, adding earthworms could enhance CEC in the soil and its increasing amplitude was highest in the soil without pollution. With the increasing of Pb concentration, the content of organic matter in the soil was increased and the content of organic matter in the soil showed an increasing trend on the whole after adding earthworms. When Pb was at 1 000 mg/kg, adding earthworms had no effect on the chemical prosperities of Pb-polluted soil. [Conclusion] In the soil with Pb at 0-100 mg/kg, adding earthworms could decrease Pb absorption of crops and increase the crop yield. In the soil with Pb at 500 mg/kg, adding earthworms could enhance the repairing effects of plants.
出处
《安徽农业科学》
CAS
北大核心
2008年第2期638-639,共2页
Journal of Anhui Agricultural Sciences
基金
广西师范大学青年基金资助
关键词
蚯蚓
铅污染
PH值
阳离子交换量
有机质
Earthworm
Pb pollution
pH value
Cation exchange capacity
Organic matter
