The Distribution of Sedimentary Organic Matter and Implication of Its Transfer from Changjiang Estuary to Hangzhou Bay, China — Oak Academic Publishing
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The Distribution of Sedimentary Organic Matter and Implication of Its Transfer from Changjiang Estuary to Hangzhou Bay, China
Institute of Marine Chemistry and Environment, Department of Marine Sciences, Ocean College, Zhejiang University, Zhoushan, China
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Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
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Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
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Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
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Institute of Marine Chemistry and Environment, Department of Marine Sciences, Ocean College, Zhejiang University, Zhoushan, China
1 Institute of Marine Chemistry and Environment, Department of Marine Sciences, Ocean College, Zhejiang University, Zhoushan, China
2 Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
3 Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
4 Laboratory of Marine Ecosystem and Biogeochemistry, SOA, Second Institute of Oceanography, the State Oceanic Administration, Hangzhou, China
5 Institute of Marine Chemistry and Environment, Department of Marine Sciences, Ocean College, Zhejiang University, Zhoushan, China
In this study, a comparison was made between the Changjiang Estuary and the Hanghzou Bay, in terms of the sources and diagenesis of the sedimentary organic matter (OM). To achieve this purpose, surface sediments from the estuary and bay were analyzed for lignin-derived phenols, stable carbon isotope and TOC/TN (total organic carbon/total nitrogen) molar ratio. The signal of land-derived OM decreased, and the vanillic acid to vanillin ratio, (Ad/Al)v, increased with increasing distance from the Changjiang Estuary and the Hangzhou Bay. These results corresponded with the contribution of the terrigenous OM from the rivers to the coastal zone, and the predominance of marine OM farther offshore, and that the land-derived OM underwent decomposition during transport along the estuary and bay. It should be noted that besides the Qiantang River, Hangzhou Bay is also receiving more than half of its materials from Changjiang Estuary, which flows into the Hangzhou Bay at the north, and leaves via the southern part of the bay. This important aspect of the hydrological cycle in Hangzhou Bay corresponded to higher Λ (total lignin in mg/100 mg OC), higher TOC and C/N ratios and more elevated (Ad/Al)v and (Ad/Al)s values in the bay than the Changjiang Estuary, thus, rendering the bay as a site for the accumulation and rapid cycling of terrigenous OM.
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