摘要:
在1999年10月~2001年7月,对苏州河上游黄渡和华漕两个断面底泥疏浚前后大型底栖动物群落结构进行了对比研究.结果显示,黄渡和华漕两个断面的大型底栖动物均以软体动物和寡毛类为主,疏浚前黄渡软体动物为6种,寡毛类为3种.水蛭1种,华漕软体动物为1种,寡毛类为4种,疏浚以后两个断面的种类数增加,黄渡增加1种,华漕增加了4种,华漕恢复的迹象叫明显；疏浚后两个断面的生物量和密度均低于疏浚前,但在疏浚后,的一年内，密度呈持续上升趋势.疏浚后华漕的多样性指数一直高于疏浚前同期,黄渡在疏浚半年后逐渐恢复并且超过疏浚前水平.说明苏州河上游底泥疏浚有利于大型底栖动物群落结构的恢复.
关键词:
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底栖动物 /
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疏浚 /
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多样性指数 /
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现存量 /
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苏州河
Abstract:
From October 1999 to July 2001,this study investigated the effects of dredging on the community and structure of the micro-invertebrate in Huangdu and Huacao on headwaters of Suzhou creek. The result was that Mollusca and Oligochaeta were dominant in the both sites.Before dredging, there were six species of Mollusca,tree species of Oligochaeta and one of Hirudinea in Huangdu, and one Mollusca and four Oligochaetas in Huacao. After dredging,more species of invertebrate were found. In Huangdu,there was one species more than before, and in Huacao, there were four species more than before.So the recovery of the species in Huacao is more obvious. Dredging removed the density and biomass of the community, but the diversity of the community was increasing graduallu in one year. Furthermore, exponentisl of diversity of dredged was always higher than before in Huacao.But in Huangdu, it wasn't higher than before until half year later. It is suggested that dredging in headwaters of Suzhou creek help for the recovery of the community of micro-invertebrate.
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