残留甲拌磷对土壤微生物活性的影响

The influence of phorate residue on soil microbial activities

在实验室控制条件下,向土壤中施入甲拌磷使其质量分数分别为2,8,20mg/kg,研究了其对土壤微生物数量,微生物量碳、氮及土壤酶活性的影响。结果表明:施入甲拌磷对土壤中的真菌及放线菌具有轻微的抑制作用,但能很快恢复到对照水平;对细菌有明显的抑制作用,且抑制率随施药浓度的增大而增大,甲拌磷2,8,20mg/kg3个处理的平均抑制率分别为17.5%,35.9%和48.5%。3个浓度处理下,土壤微生物生物量碳、氮含量平均分别比对照减少了20.8%,34.8%,39.2%和19.1%,28.2%,36.1%。3个浓度处理对土壤中蔗糖酶活性的平均抑制率分别为28.0%,23.6%和9.8%,对蛋白酶活性的平均抑制率分别为12.1%,13.6%和23.8%,对碱性磷酸酶活性的平均抑制率分别为13.4%,16.1%和26.3%。在土壤中施用甲拌磷30d后,2,8,20mg/kg处理组土壤微生物商(SMB-C/SOC)分别比对照减少了13.1%,28.6%和25%。研究表明,土壤中施入甲拌磷改变了土壤微生物的群落结构,降低了土壤微生物的活性。

Influence of phorate on the quantities of soil microbes,microbial biomass C,biomass N and enzyme activities under the laboratory control condition was studied.Phorate was added to soil at dosages of 2,8,20 mg/kg,respectively.The results showed that after the application of phorate,the number of fungi and actinomyces decreased slightly,but then recovered quickly to the levels of CK.Bacteria community was inhibited significantly and the inhibiting effect was more obvious with the concentration of the phorate ...