[目的]评价3,5-二氯苯酚对沉水植物穗状狐尾藻的毒性.[方法]以穗状狐尾藻为试验对象,进行14 d生长抑制毒性试验.[结果]14 d茎长ErC50为2.84 mg/L,95％置信限为0.90 ～8.97 mg/L;14 d总茎长EvC50为2.08 mg/L,95％置信限为0.91～4.79 mg/L;14 d鲜重ErC50为2.83 mg/L,95％置信限为1.68 ～4.77 mg/L;14 d鲜重EvC5o为1.55 mg/L,95％置信限为1.09～2.21 mg/L;14 d干重ErC50为2.76 mg/L,95％置信限为1.83 ～4.18 mg/L;14 d干重EyC50为1.63 mg/L,95％置信限为1.25-2.13 mg/L.[结论]3,5-二氯苯酚对沉水植物穗状狐尾藻具有一定毒性作用,可以作为穗状狐尾藻毒性试验的参比物.%[Objective] To evaluate the toxicity of 3,5-dichloropheno on a submerged plant Myriophyllum spicatum.[Method] A 14 days of growth inhibition toxicity test was conducted on Myriophyllum spicatum as the test species.[Result] The 14 days ErC50 of total shoot length was 2.84 mg/L,and the 95％ confidence interval was 0.90-8.97 mg/L.The 14 days EyC~ of total shoot length was 2.08 mg/L,and the 95％ confidence interval was 0.91-4.79 mg/L.The 14 days ErC50 of fresh weight was 2.83 mg/L,and the 95％ confidence interval was 1.68-4.77 mg/L.The 14 days EyC50 of fresh wight was 1.55 mg/L,and the 95％ confidence interval was 1.09-2.21 mg/L.The 14 days ErC50 of dry weight was 2.76 mg/L,and the 95％ confidence interval was 1.83-4.18 mg/L.The 14 days EyC50 of fresh wight was 1.63 mg/L,and the 95％ confidence interval was 1.25-2.13 mg/L.[Conclusion] 3,5-dichloropheno was considered to have toxic effect on the submerged plant,Myriophyllum spicatum,which is suitable to be a reference substance of Myriophyllum spicatum toxicity test.
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