Rac-异丙甲草胺及S-异丙甲草胺与镉复合污染对土壤酶活性的影响  

EFFECTS OF POLLUTION OF Rac-METOLACHLOR OR S-METOLACHLOR AND ITS COMBINATION WITH CADMIUM ON SOIL ENZYME ACTIVITY

作　　者：刘惠君[1,2] 田宝莲[1] 熊明瑜[1] 朱静静[1] 

机构地区：[1]浙江大学环境与资源学院环境科学研究所,杭州310029 [2]浙江工商大学环境科学系,杭州310035

出　　处：《土壤学报》2009年第1期122-126,共5页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(20677049)资助

摘　　要：在实验室控制条件下,研究了Rac-异丙甲草胺及S-异丙甲草胺与Cd处理下对土壤过氧化氢酶和脱氢酶活性的影响。结果表明,各处理对过氧化氢酶活性表现为先激活后抑制,对脱氢酶活性表现为激活-抑制-激活;异丙甲草胺与Cd复合污染对土壤过氧化氢酶和脱氢酶活性的影响表现出一定的交互效应;Rac-和S-异丙甲草胺对过氧化氢酶活性表现出一定的手性差异,对脱氢酶活性无显著手性差异。Influence of compound pollution of Rac-metolachlor or S-metolachlor with Cd on soil catalase and dehydrogenase activity was studied in laboratory. Rae-metolachlor and S-metolachlor were added separately to the tested soil at a dosage （6.8 mg kg^-1 ） recommended for crop field and at a dosage （68 mg kg^-1 ） ten times of the recommended one; Cd was designed to have three different concentrations （0, 50, 100 mg kg^-1）. Catalase and dehydrogenase activities were tested under single stress of Rac-metolachlor or S-metolaehlor and its combination with Cd. Difference between Rac-metolachlor and S-metolachlor in enantioseleetivity towards catalase and dehydrogenase activities was also investigated. Results indicate that stress of Rae-metolachlor or S-metolaehlor was imposed, catalase activity was first enhanced and then inhibited; while dehydrogenase activity followed a similar trend, but eventually rose up again. Rae-metolaehlor and S-metolachlor showed different enantioseleetivity toward catalase activity, while no significant difference was found in enantioselectivity toward dehydrogenase activity. Under the combined pollution of Rac-metolachlor or S-metolaehlor with Cd, catalase and dehydrogenase activities showed the same trend as under the single metolachlor pollution. With the same level of metolaehlor, catalase and dehydrogenase activities were greatly influenced by increase in concentration of Cd, showing that compound pollution of metolachlor and Cd had certain interaction effect on catalase and dehydrogenase activities.

关 键 词：Rac-异丙甲草胺 S-异丙甲草胺 手性差异 复合污染 

分 类 号：X131.3[环境科学与工程—环境科学]