丁草胺对土壤微生物数量和酶活性的影响

在模拟土壤生态系统中研究了丁草胺对土壤微生物数量和酶活性的影响。试验表明,低浓度(2 mg/kg)和中等浓度(4 mg/kg)丁草胺对微生物数量影响不大;而高浓度(10 mg/kg)处理则有明显抑制效应,但在21 d后也基本恢复到对照水平。丁草胺对土壤酸性磷酸酶、碱性磷酸酶、脲酶、蔗糖酶均产生了一定的抑制作用,并随浓度升高而增强,随着时间的延长,抑制作用逐渐消失,酶活性恢复至对照水平。丁草胺对土壤过氧化氢酶的影响与其他酶不同,表现出一定的刺激作用。

Effect of Butachlor on Soil Microbial Populations and Enzyme Activities

The effect of butachlor on soil microbial populations and enzyme activities was investigated in a microcosm mimicing soil ecosystem. The effect of butachlor at rates of 2 mg/kg and 4 mg/kg on soil microbial population is a temporal phenomenon and disappears within a few days, However, butachlor at high rate of 10 mg/kg inhibited soil microbial population significantly till 21 days after treatments. The activities of acid phosphatase, alkaline phosphatase, urease and invertase in soil treated with butachlor were all inhibited, The inhibitory effect disappeared gradually with time, and enzyme activities recovered to the levels of the control without butachlor. The influence of butachlor on catalase was different from acid phosphatase, alkaline phosphatase, urease and invertase, an enhancement effect was observed.