【摘要】 通过模拟实验研究了除草剂碘甲磺隆钠盐对土壤中脲酶、过氧化氢酶、呼吸作用及土壤微生物生物量碳的影响。结果表明:碘甲磺隆钠盐在田间施用量 (1mg/kg)下对土壤脲酶和微生物生物量碳的影响呈现为显著的抑制 恢复过程;对土壤过氧化氢酶的影响呈现出轻微的抑制 激活 恢复过程。碘甲磺隆钠盐施用初期对土壤呼吸作用也有一定的影响,浓度愈大,对土壤呼吸强度的抑制愈强,但随着时间的推移,逐步由抑制作用转为一定程度的激发作用,到 12d后施药土壤与对照组土壤的呼吸强度基本上趋于一致。统计分析结果表明,碘甲磺隆钠盐属于低毒或无实际危害的农药。更多还原

【Abstract】 The effects of iodosulfuron-methyl sodium on several biological indicators in soil were studied by stimulated methods in laboratory. The results showed that the soil urease activity and (microbial) biomass carbon were restrained significantly, and then, come consistent with CK, and the catalase activity of soil was lightly restrained at first, then stimulated and recovered as the soil treated with iodosulfuron-methyl sodium at a level of 1 mg/kg. Iodosulfuron-methyl sodium also had some effects on soil respiration, the higher concentration the greater influence during the early days. But as time goes on, the restraining of respiration turns to stimulating, and after 12 days it showed almost no difference between the respiration of soil treated by iodosulfuron-methyl sodium and CK soil. The (result) of statistical analysis showed that iodosulfuron-methyl sodium is a low toxicity or not (harmful) herbicide.更多还原