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首页> 外文期刊>Environmental toxicology and chemistry >THE RESPONSE OF BIOTA IN EXPERIMENTAL STREAM CHANNELS TO A 24-HOUR EXPOSURE TO THE HERBICIDE VELPAR L~®
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THE RESPONSE OF BIOTA IN EXPERIMENTAL STREAM CHANNELS TO A 24-HOUR EXPOSURE TO THE HERBICIDE VELPAR L~®

机译：生物对实验性渠道中除草剂VELPAR L〜®的反应

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Outdoor experimental stream channels were used to examine the short-term impact of Velpar L~® on periphyton and macroinvertebrates. Velpar L was added to five channels for 24 h while five additional, alternating channels served as controls. The concentration and the duration of the Velpar L treatment were chosen to mimic the pulse of herbicide carried to streams during rain events subsequent to Velpar L spraying. The mean concentration of hexazinone, the active ingredient, in the treatment channels varied over time from 145 μg L~(-1) to 432 μg L~(-1). Periphyton chlorophyll-a-specific productivity was reduced by 80% during the Velpar L addition. Within 24 h after the termination of the Velpar L addition, periphyton productivity returned to control levels. The 4-h EC50 value, 3.6 μg L~(-1) of hexazinone, for chlorophyll-a-specific productivity was lower than published bioassay results from single species tests. Mean periphyton biomass (chlorophyll-a per unit area of gravel substrate) and mean macroinvertebrate biomass, density, length, and drift were not significantly affected by the Velpar L addition. Although it appears that lotic systems are resilient to short-term exposure to Velpar L, the effects of repeated and chronic exposures on stream biota remain unexplored.
机译：室外实验河道用于检验VelparL®对水生植物和大型无脊椎动物的短期影响。 Velpar L被添加到五个通道中24小时，而另外五个交替的通道用作对照。选择Velpar L处理的浓度和持续时间以模拟在Velpar L喷洒后的降雨事件中带到河流的除草剂脉冲。治疗通道中活性成分六嗪酮的平均浓度随时间从145μgL〜（-1）到432μgL〜（-1）变化。 Velpar L添加过程中，附生植物叶绿素a的比生产率降低了80％。 Velpar L添加终止后的24小时内，浮游植物的生产力恢复到控制水平。叶绿素a比生产率的4-h EC50值为3.6μgL〜（-1），比单种试验公布的生物测定结果低。 Velpar L的添加对平均周生生物量（每单位砾石基质的叶绿素-a）和平均无脊椎动物生物量，密度，长度和漂移没有显着影响。尽管看起来乳液系统对短期暴露于Velpar L具有抵抗力，但长期和反复暴露对河流生物群的影响尚待探索。

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