施用漂白粉对池塘理化性质及底栖动物的影响

采用常规剂量对鱼塘施用漂白粉，对施用前后水质的理化指标和底栖动物的变化情况进行了测定和计数。结果表明，施用漂白粉之后，池水的透明度、pH、碱度和硬度分别有所增中，而溶解氧、化学耗氧量、无机氮化合物和磷酸盐呈不同幅度的下降；底栖动物的数量亦明显下降，但是其中摇蚊幼虫的数量在短期内恢复较快。

The Effects of Applying Bleaching Powder on the Physical and Chemical Properties of Water and Demersal Creatures

The physical and chemical properties of water ,the change of demersal creatures in the pond were mensurated before and after delivering bleaching powder into the pond with routine doses.The results showed that the transparency ,pH,alkalinity and hardness increased,but D.O,COD, inorgnic nitrogenous compounds and phosphate decreased in defferent degrees after delivering bleaching powder ;the quantity of demersal creatures also decreased distinctly ,but the quantity of midge larva recovered quickly after a short time.