阿维菌素对蔬菜地土壤微生物及土壤酶的生态毒理效应

ECO-TOXICOLOGICAL EFFECTS OF ABAMECTIN ON VEGATABLE-GROWING SOIL MICROORGANISMS AND ENZYMES ACTIVITY

研究了阿维菌素对蔬菜地土壤微生物和土壤酶的生态毒理效应.实验结果表明,阿维菌素在低浓度时（1～10 mg kg^-1）对土壤脲酶活性和脱氢酶活性有轻微的激活作用,而对土壤微生物呼吸强度没有明显的影响;在高浓度时（50～100 mg kg^-1）对土壤微生物呼吸强度、脲酶活性以及脱氢酶活性均有明显抑制作用;不同浓度阿维菌素在不同程度上均会造成土壤微生物生物量的减少和过氧化氢酶活性被强烈激活.

Effects of abamectin, applied at 1, 5, 10, 50 or 100 mg kg^-1, on vegatable-growing soil microorganisms and their respiration, and the activity of urease, dehydrogenase and catalase, in vegetable fields were investigated. Results show that when it was low in application rate （1 - 10 mg kg^-1） abamectin, stimulated slightly activity of urease and dehydrogenase, but did not have much on soil respiration. And when it was high （50- 100 mg kg^-1）, it displayed strong inhibitive effects on respi- ration, and activity of urease and dehydrogenase. Regardless of application rate（1 - 100 mg kg^-1）, abamectin reduced biomass of soil microbes to a varying extent and strongly stimulated activity of soil catalase.