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

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Chinese Journal of Oceanology and Limnology 2014年第1期32卷 155-161页

作者：程芳晋俞志明宋秀贤 Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences

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, I＂. 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.

关键词： diatom assemblages Changjiang River estuary East China Sea environmental implications

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diatom distribution in surface sediments from Chinese inshore waters and the relationship to modern environmental variables

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Chinese Journal of Oceanology and Limnology 2014年第4期32卷 828-844页

作者：陈淳赵广涛陈敏蓝东兆兰彬斌 Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of China College of Marine Geosciences Ocean University of China Geology Laboratory of Marine and Coastal Environment Third Institute of Oceanography State Oceanic Administration

diatoms are widely used to study past and present changes in the marine environment. Unimodal models are appropriate for exploring the relationship between environmental properties in Chinese inshore waters and fossil diatom species derived from modem surface sediments. The best-fit relationships between two multivariate datasets （diatom species and environmental variables） were identified using canonical correspondence analysis （CCA）, which is a constrained ordination technique. The absolute abundance of diatoms in the Chinese inshore waters ranged from 500 to 48 000 valves/g, and the average absolute abundance of all the 29 sites was l l 300 valves/g. 153 species and varieties of diatoms belonging to 42 genera in all were identified in the Chinese inshore waters. There were 28 dominant diatom species in all. According to the absolute abundance of the dominant species and the spatial distribution of the currents from the Chinese inshore waters, 12 diatom assemblages were distinguished from north to south, which reflected the different oceanographic conditions at the regional scale. Of the eight environmental variables considered, the most important environmental variable is winter sea surface salinity （WSS）, which was also the only environmental variable with statistical significance. Therefore, it may be used to establish a transfer functions for the Chinese inshore waters in future paleoclimate studies.

关键词： inshore waters diatom assemblages environmental variables canonical correspondence analysis (CCA)

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diatom distribution in surface sediments from the Chinese inshore waters and their relationship to modern environmental variables

Diatom distribution in surface sediments from the Chinese in...

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福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会

作者：陈淳赵广涛陈敏蓝东兆兰彬斌 Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of China College of Marine Geosciences Ocean University of China Geology Laboratory of Marine and Coastal Environment The Third Institute of OceanographyState Oceanic Administration Island Research Center State Oceanic Administration

diatoms are widely used to study past and present changes in the marine environment. Unimodal models are appropriate for exploring the relationship between environmental properties in Chinese inshore waters and fossil diatom species derived from modern surface sediments. The best-fit relationships between two multivariate datasets(diatom species and environmental variables) were identified using Canonical Correspondence Analysis(CCA), which is a constrained ordination technique. The absolute abundance of diatoms in the Chinese inshore waters ranged from 500 to 48000 valves/g, and the average absolute abundance of all the 29 sites was 11300 valves/g. 153 species and varieties of diatoms belonging to 42 genera in all were identified in the Chinese inshore waters. There were 28 dominant diatom species in all. According to the absolute abundance of the dominant species and the spatial distribution of the currents from the Chinese inshore waters, twelve diatom assemblages were distinguished from north to south, which reflected the different oceanographic conditions at the regional scale. Of the 8 environmental variables considered, the most important environmental variable is winter sea surface salinity(WSS), which was also the only environmental variable with statistical significance. Therefore, it may be used to establish a transfer functions for the Chinese inshore waters in future paleoclimate studies.

关键词： inshore waters diatom assemblages environmental variables CCA

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