苏州河底泥疏浚对围隔中水生生态系统的影响

通过底泥疏浚的围隔试验，对疏浚前后水质状况、浮游生物、微生物数量以及水体对生物的毒性进行对比，结果显示，疏浚使水质有所改善，水体中重金属浓度基本处于稳定；对微生物的数量没有太大的不良影响，且可以很快恢复到原来的水平；疏浚后水体的生物毒性降低，表现在疏浚后河水对发光细菌的毒性降低，试验动物死亡率下降，肝体比下降，精子异常发生率下降.因此，苏州河合理的底泥疏浚有利于水生生态系统的恢复.

Influence of Dredging on Suzhou Creek Ecology System(Chinese)

This study investigated the effects of dredging on the water quality,the quantity of plankton and microbe,and the toxicity of sediment.The results were as follows:after dredging, the water quality was improved;the concentration of heavy metal in water held the line;the vari- ety of the microbe quantity was not obvious and might be recovered soon;and the toxicity of sed- iment was relatively weak,it included that the toxicity of sediment for the luminescent bacteria was depressed;the death rate of animal declined;the rate of liver in avoirdupois declined;and the rate of exceptional mouse sperm declined.It is suggested that dredging in Suzhou creek helped for the recovery of the aquatic ecosystem.