The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale

KANG Xuming; SONG Jinming; YUAN Huamao; LI Xuegang; LI Ning; DUAN Liqin

doi:10.1007/s13131-017-1076-1

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Article Navigation > Acta Oceanologica Sinica > 2017 > 36(11): 68-78

KANG Xuming, SONG Jinming, YUAN Huamao, LI Xuegang, LI Ning, DUAN Liqin. The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale[J]. Acta Oceanologica Sinica, 2017, 36(11): 68-78. doi: 10.1007/s13131-017-1076-1

Citation:

KANG Xuming, SONG Jinming, YUAN Huamao, LI Xuegang, LI Ning, DUAN Liqin. The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale[J]. Acta Oceanologica Sinica, 2017, 36(11): 68-78. doi: 10.1007/s13131-017-1076-1

Citation:

KANG Xuming, SONG Jinming, YUAN Huamao, LI Xuegang, LI Ning, DUAN Liqin. The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale[J]. Acta Oceanologica Sinica, 2017, 36(11): 68-78. doi: 10.1007/s13131-017-1076-1

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The sources and composition of organic matter in sediments of the Jiaozhou Bay:implications for environmental changes on a centennial time scale

doi: 10.1007/s13131-017-1076-1

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2017-01-12
Rev Recd Date: 2017-02-08

Abstract

Abstract

The Jiaozhou Bay is characterized by heavy eutrophication that is associated with intensive anthropogenic activities. Four core sediments from the Jiaozhou Bay are analyzed using bulk technologies, including sedimentary total organic carbon (TOC), total nitrogen (TN), the stable carbon (δ¹³C) and nitrogen (δ¹⁵N) isotopic composition to obtain the comprehensive understanding of the source and composition of sedimentary organic matter and further shed light on the environmental changes of the Jiaozhou Bay on a centennial time scale. Results suggest that the TOC and TN concentrations increase in the upper core, having indicated a probable eutrophication process since the 1920s in the inner bay and the 2000s in the bay mouth. The TOC and TN concentrations outside the bay have also changed since 1916 owing to the variation of terrigenous input. Considering TOC/TN ratio, δ¹³C and δ¹⁵N, it can be concluded there is a mixture of terrigenous and marine organic matter sources in the study area. A simple two end-member (terrigenous and marine) mixing model using δ¹³C indicats that 45%-79% of TOC in the Jiaozhou Bay is from the marine source. The environmental changes of the Jiaozhou Bay are recorded by geochemical proxies, which are influenced by the intensive anthropogenic activities (e.g., extensive use of fertilizers, and discharge of sewage) and climate changes (e.g., rainfall).
- organic matter,
- sources,
- anthropogenic activities,
- environmental changes,
- sediments,
- Jiaozhou Bay

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References(51)

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