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General Session 2: Marine & estuarine biogeochemistry |
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Research of surface sediment biogenic elements distribution in the Yangtze River Estuary and adjacent waters
GS2-07-S
Xin Fan* , Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences;
Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology;
University of Chinese Academy of Sciences
Fangjin Chen, Qingdao Environment Monitoring Station
Zhiming Yu, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences;
Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology;
Xiuxian Song, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences;
Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology;
Presenter Email: fxpositivity@163.com
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| Surface sediment samples were collected from 44 stations in Yangtze River Estuary and its adjacent waters in November 2015. The grain size, biological silicon (BSi), total organic carbon(TOC) and total nitrogen(TN) were analyzed for discussion the spatial distributions and the mutual relations between the above features. The results showed that surface sediment in the Yangtze Estuary and its adjacent waters was mainly composed by clay and silt. Sand sediment mainly distributed in the northern of the survey waters, in which the average particle size reached 154.40μm. The main components of the south sea were clay and silt, and the average particle size were just 76.10μm. Two types of particle size distribution pattern were delimited approximately along 30°N. In addition, the BSi contents of the surface sediments range from 0.224%-1.817%, which are positively correlated with the contents of clay and silt in the sediments(P<0.01), and the correlation coefficients (R2) were 0.780 and 0.628, respectively. Clay minerals and silt sediment can accumulate and save BSi easily. The contents of TOC and TN range from 0.035%-1.165% and 0.01-0.26%, respectively. Their distribution characters had a significant positive correlation with grain size and BSi, suggesting fine grained sediments are more favorable for the preservation of organic matter. According to our results diatoms may be one of the sources of organic matter in the surface sediment samples. |
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