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湖泊科学  2011 

太湖梅梁湾摇蚊亚化石沉积记录及营养演化研究

DOI: 10.18307/2011.0409

Keywords: 太湖,梅梁湾,摇蚊,沉积记录,富营养化

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Abstract:

对太湖梅梁湾T0905岩芯摇蚊幼虫亚化石组合进行了分析,探讨了自1940年以来梅梁湾湖区摇蚊幼虫对营养盐演化的响应.结果表明,梅梁湾湖区摇蚊组合变化以1970年为分界点,经历了由Tanytarsus为优势属种向富营养属种Chironomusplumosus-type和Microchironomus为优势组合转变的过程.1970年以前,沉积物中摇蚊以Tanytarsus为主,梅梁湾湖区水质相对较好,为中营养水平;1970年以来,Tanytarsus的相对丰度伴随Chironomusplumosus-type的增加而迅速降低,耐营养种Propsilocerusakamusi-type也开始出现,尤其是1990s以来,富营养种Microchironomustabarui-type的百分含量也迅速增加,梅梁湾湖区营养水平迅速升高,水体由中富营养水平转变为富营养水平。

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