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引用本文:董旭辉,羊向东,潘红玺.长江中下游地区湖泊现代沉积硅藻分布基本特征.湖泊科学,2004,16(4):298-304. DOI:10.18307/2004.0402
DONG Xuhui,YANG Xiangdong,PAN Hongxi.Distribution of Modern Lake Sediment Diatoms in the Middle and Lower Reaches of Yangtze River Catchment. J. Lake Sci.2004,16(4):298-304. DOI:10.18307/2004.0402
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长江中下游地区湖泊现代沉积硅藻分布基本特征
董旭辉1,2, 羊向东1, 潘红玺1
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.中国科学院研究生院, 北京 100039
摘要:
首次对长江中下游地区45个湖泊表层沉积硅藻进行了分析.根据硅藻多属种百分含量在总磷浓度和营养梯度上的分布规律以及硅藻数据的降维对应分析(DCA)结果表明,硅藻组合响应于湖泊营养态的变化,尤其是当水体接近于富营养态时,硅藻组合出现迅速转变,即以附生、附生浮游、浮游和底栖种类的多生态型的硅藻组合迅速被富营养浮游种为优势的组合取代.由此提出当Cyclostephanos、Stephanodiscus等种类和Cyclotella meneghinianaC.atomus组合出现可以预警湖泊水体富营养的发生.另外,硅藻组合还能很好地指示草型和藻型湖泊的特征,可望成为有效判识湖泊生态类型的工具.
关键词:  长江中下游湖泊  硅藻组合DCA分析  营养梯度
DOI:10.18307/2004.0402
分类号:
基金项目:中国科学院重大创新项目(KZCX1-SW-12)太湖"973"项目(2002CB412300)共同资助.
Distribution of Modern Lake Sediment Diatoms in the Middle and Lower Reaches of Yangtze River Catchment
DONG Xuhui1,2, YANG Xiangdong1, PAN Hongxi1
1.Nanjing Institute of Geography and Limnology. Chinese Academy of Sneru-es, Nanjing 210008, P. K. China;2.Graduate School of CAS, Beijing 100039, P. R. China
Abstract:
The surfare-sediment diatom assemblages of 45 lakes in the middle and lower reaches of Yangtze River region were examined for the first time.The diatom abundance distribution pattern along the gradient of total phosphorus concentration and nutrition, as well as the result from DCA using the diatoms data, indicated that the diatom assemblages were responsed towards the changes of lake nutrition states.The assemblage dominated by multi-ecotypes mainly with epiphytic, facultative planktonic, planktonic and epilithic taxa was replaced rapidly by nutrient tolerant planktonic taxa when the lake comes close to be eutropicated.Consequently it is proposed that the occurrence of the assemblages combined with the taxa of the genera Cyclostephanos, Stephanodiscus and Cy-clotella meneghiniana, C.atomus could be an alert to the lake eutropication.Moreover,the diatom assemblages perfectly denoted the characters of the macrophyte-dominant lakes and the algal-dominant lakes, and were likely to be an effective tool forjudging the ecological type of lakes.
Key words:  Lakes in middle and lower reaches of Yangtze River region  diatom assemblage  Detrending correspondence analysis (DCA)  nutrition gradient
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