镉与苄嘧磺隆除草剂单一污染和复合污染土壤的微生物生态效应

Ecological effects of both single and combined pollution of Cd and bensulfuron-methyl on soil microorganisms

土壤微生物生物量碳、微生物生物量氮、基础呼吸以及土壤酶活性是表征土壤质量的重要生物学指标.研究了镉与苄嘧磺隆除草剂的单一污染和复合污染对这些生物学指标的影响随时间的动态变化,结果表明,无论是单一污染还是复合污染对土壤微生物生物量碳和氮、基础呼吸、磷酸酶和蔗糖酶活性的影响均随时间的推移表现为先增加后减小的趋势.镉与苄嘧磺隆除草剂复合污染之间存在很明显的交互作用,对土壤生物学指标的影响依次为:镉与苄嘧磺隆除草剂复合污染>苄嘧磺隆除草剂>镉.

The most important biological indicators characterizing the soil quality are soil microbial biomass carbon (Cmic), microbial biomass nitrogen (Nmic), soil basic respiration and soil phosphatase and sucrase activities. The dynamic effects of both single and combined pollution of Cd and bensulfuron-methyl herbicide on these biological indicators were studied under laboratory incubation conditions. Under the stress of both single and combined pollution of Cd and bensulfuron-methyl herbicide, the levels of these soil biological indicators were significantly reduced at the initial period, and then gradually increased with time. It was found that there was a significant interaction between Cd and bensulfuron-methyl herbicide in case of combined pollution. The toxicity effect followed the order of combined pollution of Cd and bensulfuron-methyl herbicide > bensulfuron-methyl herbicide >Cd.