中文摘要：

三唑类杀菌剂是一种在农业上广泛应用的广谱性杀菌剂。三唑类杀菌剂在农田施用后能够向土壤深处迁移和扩散,从而污染土壤和地下水体,因此三唑类杀菌剂对土壤生态环境能够造成一定的破坏。选择三唑酮为研究对象,参照经济合作与发展组织（Organization for Economic Co-operation and Developement,OECD）标准方法研究三唑酮对大型溞的慢性毒性效应。21d慢性毒性研究结果表明,大型溞繁殖指标-内禀增长率是对三唑酮最为敏感的毒性参数。其慢性毒性下限值（LCL）和慢性毒性上限值（UCL）分别为40和80μg·L-1。三唑酮对于第2代大型溞,染毒的影响比对第1代的影响更大。对第2代恢复的大型溞除了第1次产卵数没有显著性差异,其他指标都有所变化,这说明毒物被转移到子代中。

英文摘要：

Triazole fungicides are widely used in agriculture as broad-spectrum fungicides,which can contaminate deep soil and ground water systems through migration and proliferation.A representative of triazole fungicides-triadimefon was selected to investigate its chronic toxicity to Daphnia magna with reference to standard method of Organization for Economic Co-operation and Developement （OECD）.Results of 21 d chronic toxicity test showed that intrinsic increase rate （one of the reproduction indicators） was the most sensitive indicator to triadimefon.The values of lower chronic limit （LCL） and upper chronic limit （UCL） were 40 and 80 μg·L-1,respectively.Triadimefon had greater effect on the second generation than the first generation of Daphnia magna exposed to toxicant for 21 days.Except the numbers of the first brood,other indicators of the second generations were significantly affected by triadimefon,indicating that the poison could be transferred from the first generations to the offsprings.