After spraying the herbicide, the results with time show that no obvious quantitative difference occurred in benthic species composition, biomass, inhabit density and the coherent variation trend between experimental zone and controlled zone.

• 药物喷洒后不同时段调查结果表明：试验区与对照区的底栖生物种类组成、生物量、栖息密度同步对比数量相差不明显，其随时间变化的趋势亦呈现总体一致。