氯嘧磺隆对土壤微生物类群及土壤呼吸强度的影响

Effects of Chlorimuron-ethyl on Soil Microorganism Population and Soil Respiration Intensity

通过实验室培养试验研究了氯嘧磺隆对土壤微生物种群动态变化和土壤呼吸强度的影响。测定了0、5、10、20、100μg kg-1的氯嘧磺隆对土壤中三大类微生物种群动态变化的影响,结果表明,氯嘧磺隆促进土壤细菌和真菌的生长,抑制放线菌的生长,真菌是氯嘧磺隆胁迫下的优势菌群。密闭法测定了0.01、0.1、1、10、100μg g-1的氯嘧磺隆对土壤呼吸的影响,结果表明,0.01、0.1、1、10μg g-1的氯嘧磺隆轻微抑制土壤呼吸,但受抑制的土壤逐渐恢复,除10μg g-1外,其它处理可恢复到对照水平,高浓度100μg g-1的氯嘧磺隆促进土壤呼吸,不能恢复到对照水平,但根据危害系数法的分级方法计算,氯嘧磺隆属于无实际毒害的农药。

Effects of Chlorimuron-ethyl on soil microorganism population and soil respiration intensity was investigated. Results showed that bacteria and fungi growth were stimulated and actinomycetes growth was inhibited by Chlorimuron-ethyl. Fungi was dominant species by Chlorimuron-ethyl intimidation. Effect of Chlorimuron-ethyl on soil respiration was tested with closed or direct absorption method. The results showed that soil respiration intensity was slightly inhibited with the concentrations of 0.01, 0.1, 1, 10g g^-1 dried soil of Chlorimuron-ethyl, but could be recovered except 10g g^-1 treatment. Soil respiration intensity was stimulated with Chlorimuron-ethyl of 100g g^-1 and could not be recovered to normal level. According to risk assessment, Chlorimuron-ethyl should belong to non-poisonous pesticide.