咪鲜胺及其制剂对三叶浮萍生长的影响

Effect of Prochloraz and Its Formulation on the Growth of Lemna paucicostata

为了全面正确地评价咪鲜胺的生态环境效应与生物毒性,采用室内恒温光照试验研究了咪鲜胺及其制剂施保克对三叶浮萍生长的影响.结果表明:低质量浓度的咪鲜胺(低于1.56mg/L)和施保克(小于0.63mg/L)能促进三叶浮萍的生长,表现为刺激作用,而高质量浓度的咪鲜胺(大于或等于1.56mg/L)和施保克(大于或等于0.63mg/L)则对三叶浮萍的生长表现为明显的抑制作用,而且,这种抑制作用还会随着处理时间的延长或处理浓度的上升而加强.总体表现出“低(浓度)促高(浓度)抑”或“长(作用时间)抑短(作用时间)促”的毒性效应.第1天时,咪鲜胺对三叶浮萍的毒性低于施保克的毒性,但随着时间的推移(处理2d以后),咪鲜胺的毒性均高于施保克.

In order to assess the bioenvironmental effect and biological toxicity of prochloraz comprehensively and correctly, under the conditions of illumination and constant temperature, the experiment about the effect of prochloraz and its formulation （sportak） on L .paucicostata＇s growth was studied in the laboratory. When the concentration of prochloraz less than 1.56 mg/L, the growth of L.paucicostata can be stimulated in 1^st day and the stimulating action would drop slightly in the following three days. However, the growth of L.paucicostata could be inhibited obviously when the concentration of prochloraz higher than 1.56 mg/L. When it came to sportak, there was a similar result like prochloraz. In a word, the lower concentration or the longer duration of action promoted the growth of L.paucicostata, and the higher concentration or shorter duration of action inhibited its growth. It also can be found that in the first day, the toxicity of prochloraz to L.paucicostata was lower than that of sportak to L.paucicostata and in the following three days, the toxicity kept higher than that of sportak to L.paucicostata, which should be paid more attention and deeply discussed.