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作 者:韩冰[1] 高明[1] 王子芳[1] 罗友进[1] 王龙[1] 田蜜[1]
出 处:《西南大学学报(自然科学版)》2010年第7期83-87,共5页Journal of Southwest University(Natural Science Edition)
基 金:国家科技支撑计划项目资助项目(编号2007BAD87B10-02;2008BABA7B09-03)
摘 要:土壤微生物生物量碳及酶活性是表征土壤质量的重要生物学指标.采用培养实验,研究了重金属Zn、Pb与草甘膦复合污染对这些生物学指标的影响.结果表明:培养期前后相比,土壤微生物生物量碳及过氧化氢酶、脲酶活性普遍降低,而转化酶活性普遍增加;Zn、Pb与草甘膦对微生物生物量碳和酶活性的影响在复合污染作用中与单独作用时差异较大;在复合污染条件下,Zn对微生物生物量碳、过氧化氢酶活性及转化酶活性均表现为负效应,而对脲酶活性则表现为一定的正效应;Pb对微生物生物量碳、过氧化氢酶活性及脲酶活性的影响为正效应,尤其对过氧化氢酶激活作用显著,其对转化酶则表现为负效应.在三者中,草甘膦对微生物生物量碳与酶活性的影响最大,尤其对过氧化氢酶表现为极显著抑制作用;Zn、Pb、草甘膦对土壤微生物生物量碳与酶活性的效应大小顺序为:草甘膦,Pb,Zn.A pot experiment was conducted to investigate the effects of Zn,Pb and glyphosate compound pollution on microbial biomass C content and enzyme activities in the soil.The results showed that microbial biomass C content and the activities of catalase and urease increased widely while converting enzyme activity was reduced after the culture period.Effects of Zn-Pb-glyphosate compound pollution were different from those of single-factor pollution by Zn,Pb or glyphosate.Under Zn-Pb-glyphosate compound pollution,Zn showed a negative effect on microbial biomass C content and catalase and converting enzyme activity but a positive effect on urease activity.Pb performed positive effects on microbial biomass C content and catalase and urease activity,especially on catalase activity,and negative effects on conversion enzyme activity.Glyphosate had the greatest effect on the four attributive variables and,particularly,exhibited a significant inhibitive effect on catalase activity.The effects of Zn,Pb and glyphosate on microbial biomass C content and enzyme activities appeared in the order of glyphosate PbZn.
分 类 号:X171.5[环境科学与工程—环境科学] S154.2[农业科学—土壤学]
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