Organic geochemical studies of sinking particulate material in China sea area(I) |
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| Authors: | Yi Duan Jinming Song Mingzhong Cui Binjie Luo |
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| Institution: | (1) Lanzhou Institute of Geology, Chinese Academy of Sciences, 730000 Lanzhou, China;(2) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China |
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| Abstract: | Sinking particulate material collected from Nansha Yongshu reef lagoon and the continental shelf of the East China Sea by
sediment traps has been analyzed and studied for the first time using organic geochemical method. The results show that about
half of the sinking particulate organic matter in the two study areas are consumed before reaching the depth of 5 m to the
sea floor and the degree of this consumption in Yongshu reef lagoon is larger than that in the continental shelf of the East
China Sea. The distributions of hydrocarbons and fatty acids indicate that the minor difference of biological sources of sinking
particulate organic matter exists between Yongshu reef lagoon and the continental shelf of the East China Sea, but they mainly
come from marine plankton. Stronger biological and biochemical transformations of sinking particulate organic matter are also
observed and the intensity of this transformation in Yongshu reef lagoon is greater than that in the continental shelf of
the East China Sea. It is found that the occurrence of C25 highly branched isoprenoid (HBI) diene may be related to the composition of diatom species. |
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| Keywords: | marine sinking particulate organic matter lipid compounds organic matter flux biological source biological and biochemical process |
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