除草剂敌草胺胁迫下土壤酶的活性动态响应  

Dynamic Responses of Activities of Enzyme in Soil to Herbicide Napropamide Contamination

作　　者：吴小毛[1,2] 龙友华[1,2] 李荣玉[2] 李明[2] 

机构地区：[1]贵州大学农学院植物保护系,贵州贵阳550025 [2]贵州大学作物保护研究所,贵州贵阳550025

出　　处：《贵州农业科学》2013年第8期116-118,共3页Guizhou Agricultural Sciences

基　　金：贵州大学博士基金项目"敌草胺在土壤多介质环境中的复合行为及生物可用性研究"[贵大人基合字(2011)06]

摘　　要：为了解除草剂敌草胺对土壤酶活性的影响及相对毒性,采用室内模拟法研究了敌草胺胁迫下土壤酶活性的动态响应。结果表明:培养前期,敌草胺对土壤过氧化氢酶具有激活作用,对磷酸酶具有抑制作用,且激活或抑制程度均与浓度呈正比,而对脲酶的影响则表现为低浓度时激活,高浓度时抑制,在培养初期对脱氢酶也具有一定激活作用。培养后期,土壤过氧化氢酶、脱氢酶、脲酶和磷酸酶活性表现为抑制、恢复的变化趋势。在污染早期,过氧化氢酶和磷酸酶对敌草胺较敏感,可以作为表征敌草胺残留土壤污染的生物活性指标。To ascertain effects of napropamide on soil enzyme activity and its relative toxicity, an incubation test was conducted to evaluate the dynamic responses of activities of enzyme in soil to herbicide napropamide contamination by using the laboratory simulative method. The results showed that in the earlier period of incubation, napropamide could activate and inhibit activity of catalase and phosphatase respectively, and the higher the herbicide concentration the greater the influence extent. However, napropamide could activate and inhibit the activities of urease and at the low level and high level, respectively. Napropamide could also activate the dehydrogenase activity in the earlier period of incubation. In the later period of incubation, the response of catalase, dehydrogenase, urease and phosphatase to napropamide exhibited a change trend of inhibition and recovery. In terms of soil enzymes, catalase and phosphatase in the earlier period of pollution were more sensitive to residues of napropamide than other soil enzymes, and could be taken as the indicator to indicate the contamination degree of soils coming from application of napropamide.

关 键 词：敌草胺 土壤 酶活性 

分 类 号：S482.46[农业科学—农药学]