四种酰胺类除草剂对土壤酶活性的影响

在实验室控制条件下,研究了酰胺类除草剂丁草胺、乙草胺、丙草胺和异丙甲草胺在田间推荐用量下,对土壤过氧化氢酶活性和脱氢酶活性的影响.结果表明,培养初期,4种除草剂对2种酶活性有不同程度的抑制作用,土壤过氧化氢酶活性于第7d就很快恢复,而脱氢酶活性在13d后得以逐渐恢复.添加稻秆可使土壤酶活性提高,土壤脱氢酶比过氧化氢酶活性变化大.4种除草剂对土壤生态环境影响不大,稻秆还田有利于提高土壤中生化过程的活性,缓冲外来污染物对土壤生态的影响.

Influence of four acetanilide herbicides on soil enzyme activity

Influence of acetanilide herbicides butachlor, acetochlor, pretilachlor and metoalchlor on soil catalase and dehydrogenase activities was studied at field recommended application amounts, under the laboratory control condition. In the initia/culture period, 4 kinds of herbicide had inhibition action of different degree on 2 kinds of enzyme activity. The dehydrogenase activities recovered quickly after 7d; while dehydrogenase activity recovered gradually after 13d; the straw addition could enhance the soil enzyme activity; the activity change of soil dehydrogenase was higher than that of catalase. The influence of 4 kinds of herbicide on soil ecoenvironment was not great. Return of straw to field was favorable to enhance the activity of biochemical process in soil; and to reduce the soil ecological environmental influence by outside contaminants.