以浮游生物为指示生物的苏州河生态安全评价

Eco-toxicological Assessment of River Water and Sediment of Suzhou Creek with Plankton as Test Organism

采用斜生栅藻,羊角月牙藻和大水蚤对苏州河主要几种重金属以及不同河段河水及底泥进行了生态影响实验,得到了以大水蚤EC50为指标的苏州河主要几种重金属生态安全阈值。同时结果还表明,与郊区黄渡段相比,苏州河市区河段河水对供试浮游生物呈现了一定的抑制作用,某些点位的生态影响甚至达到统计学显著性水平。黑泥层底泥抑制作用大于浮泥层底泥。因此,尽管苏州河经过二期整治后,水环境质量的景观指标有明显改善,但市区段河水和底泥对生物定居仍有一定的抑制作用,对苏州河生态安全构成一定的影响。

Planktons such as Scenedesmus obliquus, Selenastrum capricormutum and Daphnia magna are used as test organism for evaluating the Suzhou Creek's eco-toxicity in terms of river water and sediments after its pollution abatement over the past years. The study shows that extract from samples of lower-layer sediment in the downtown section of the creek still has definite toxicological effects on the planktons.