【摘要】 为明确噻酮·异噁唑对玉米根际土壤微生物量碳、氮及酶活性的影响,采用田间试验的方法,测定了田间推荐剂量、5倍推荐剂量和10倍推荐剂量的噻酮·异噁唑土壤封闭处理对玉米根际土壤微生物量碳、氮及土壤脲酶、过氧化氢酶、蔗糖酶、中性磷酸酶和脱氢酶活性的影响。结果表明,推荐剂量的噻酮·异噁唑处理后,玉米根际微生物量碳、氮与对照无显著差异,处理后28 d, 5倍推荐剂量和10倍推荐剂量处理的玉米根际土壤微生物量碳、氮受到抑制,与对照有显著差异。推荐剂量的噻酮·异噁唑对玉米根际土壤酶活性影响小,与对照无显著差异,5倍和10倍推荐剂量的噻酮·异噁唑对土壤脲酶、过氧化氢酶、蔗糖酶和脱氢酶活性具有抑制作用,但试验后期可恢复到对照水平,5倍和10倍推荐剂量的噻酮·异噁唑对中性磷酸酶活性有显著的抑制作用,施药后不可恢复到对照水平。研究表明:推荐剂量的噻酮·异噁唑对玉米根际土壤微生物量碳、氮及土壤酶活性的影响小,试验后期可恢复到对照水平。更多还原

【Abstract】 To evaluate the effect of thiencarbazone-methyl·isoxaflutole on the soil microbial biomass C, N and enzyme activities in maize rhizosphere soil, field experiments were conducted to study the effects of the recommended dosage, 5-fold and 10-fold of recommended dosage of thiencarbazone-methyl·isoxaflutole on the soil microbial biomass carbon, nitrogen, soil urease, catalase, sucrase, neutral phosphatase and dehydrogenase activity in maize rhizosphere soil. The results showed that there was no significant difference in microbial biomass carbon and nitrogen between the recommended dosage of thiencarbazone-methyl·isoxaflutole and the control. On the 28 th day after the treatment, the microbial biomass carbon and nitrogen in the rhizosphere of maize treated with 5-fold of the recommended dosage and 10-fold of the recommended dosage were inhibited, which was significantly different from the control. The activities of urease, catalase, sucrase and dehydrogenase in maize rhizosphere soil were inhibited by 5-fold and 10-fold recommended dosage of thiencarbazone-methyl·isoxaflutole, while the activity of neutral phosphatase was significantly inhibited by 5-fold and 10-fold recommended dosage of thinecarbazone-methyl·isoxaflutole. The inhibition effect could not be restored to the control level. The results suggested that the recommended dosage of thiencarbazone-methyl·isoxaflutole had little effect on the microbial biomass C, N and soil enzyme activity of maize rhizosphere soil, which could be restored to the control level in the later stage of the experiment.更多还原