摘要
[目的]评价5种稻田除草剂(37.5%二甲四氯钠·灭草松水剂、20%嘧啶肟草醚·氰氟草酯可分散油悬浮剂、30%五氟磺草胺·吡嘧磺隆·丙草胺可分散油悬浮剂、5%丙炔噁草酮乳油、80%丙炔噁草酮可湿性粉剂)对羊角月芽藻生长的抑制作用。[方法]参照《农化学农药环境安全评价试验准则》,分别测定5种供试药剂对羊角月芽藻生物量增长的抑制率和生长率的抑制率,计算半效应浓度EyC_(50)和ErC_(50)。[结果]37.5%二甲四氯钠·灭草松水剂对羊角月芽藻表现为低毒;20%嘧啶肟草醚·氰氟草酯、30%五·吡·丙草胺可分散油悬浮剂、5%丙炔噁草酮乳油、80%丙炔噁草酮可湿性粉剂对羊角月芽藻均表现中高毒性,对绿藻存在较大风险。[结论]稻田高毒除草剂在实际生产应用中应严格控制用量,尽量减小其对绿藻及水生态系统造成危害。
[Objective] To evaluate the growth inhibition of five paddy herbicides on Pseudokirchneriella subcapitata. [Method] The inhibition rate of the yield and average growth rate of five paddy herbicides on P. subcapitata were determined, and the median effective concentration EyC_(50) and ErC_(50) were calculated referring to Test Guidelines on Environmental Safety Assessment for Chemical Pesticides. [Result] The acute toxicity of MCPA-Na·bentazone on Pseudokirchneriella subcapitata was low toxic;the acute toxicity of penoxsulam·pyrazosulfuron-ethyl·pretilachlor, pyribenzoxim·cyhalofop-butyl and oxadiargyl were mid-high toxic, and they were higher risk to green algae. [Conclusion] The dosage of these paddy high-toxic herbicides should be strictly controlled to minimize their harm to the green algae and water ecosystem.
引文
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