Long-term changes in sedimentary diatom assemblages and their environmental implications in the Changjiang (Yangtze) River estuary, China

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• 作者：Fangjin Cheng (1) (2)
  Zhiming Yu (1)
  Xiuxian Song (1)
  
• 关键词：diatom assemblages ; Changjiang River estuary ; East China Sea ; environmental implications
• 刊名：Chinese Journal of Oceanology and Limnology
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：32
• 期：1
• 页码：155-161
• 全文大小：450 KB
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• 作者单位：Fangjin Cheng (1) (2)
  Zhiming Yu (1)
  Xiuxian Song (1)
  
  1. Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  
• ISSN：1993-5005

文摘

Long-term data on diatom assemblages in a sediment core (60 cm) obtained from the Changjiang (Yangtze) River estuary were analyzed in order to assess the environmental changes that took place in the approximately 38 years (as determined by 210Pb measurements), i.e., between 1974 and 2012, of sediment accumulation. From the sediment core, 62 diatom taxa and genera were identified. The diatom biomass in the core generally increased beginning in the mid-1990s (core depth: 35 cm), accompanied by a shift in the dominant species from Podosira stelliger and two species of Cyclotella (C. stylorum and C. striata) to Paralia sulcata, three species of Thalassiosira (T. eccentria, T. oestrupii, and T. excentrica), Actinoptychus undulates, and Thalassionema nitzschioides. The changes in both species diversity and abundance suggested that since the 1980s the estuary has undergone extensive eutrophication. This conclusion was supported by the increased proportion of planktonic species, another indicator of high nutrients inputs, in the Changjiang River estuary.