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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.
Soil microbial biomass carbon and enzyme activity were important biological indicators of soil quality.Using culture experiments, the effects of complex pollution of heavy metals Zn, Pb and glyphosate on these biological indexes were studied.The results showed that: before and after the cultivation period , Soil microbial biomass carbon and catalase, urease activity generally decreased, while the invertase activity generally increased; Zn, Pb and glyphosate on microbial biomass carbon and enzyme activity in the role of compound pollution alone with Under the condition of compound pollution, Zn showed negative effect on microbial biomass C, catalase and invertase activity, while showed positive effect on urease activity. Pb had a positive effect on microbial biomass carbon , Catalase activity and urease activity were positive effects, especially catalase activation was significant, which showed a negative effect on invertase.In the three, glyphosate on microbial biomass carbon and enzyme Especially for catalase. The effects of Zn, Pb and glyphosate on soil microbial biomass carbon and enzyme activities were in the order of glyphosate , Pb, Zn.