The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China
Zhang, L; Yin, KD; Wang, L; Chen, FR; Zhang, DR; Yang, YQ; yolandezhang@gmail.com
2009
发表期刊ESTUARINE COASTAL AND SHELF SCIENCE
ISSN0272-7714
卷号85期号:2页码:190-196
摘要In this study, the contents, sources and accumulation rate of sedimentary organic matter (OM) in the Pearl River Estuary (PRE) and adjacent coastal area were investigated. The stable carbon isotopic composition (delta C-13) is a reliable geochemical proxy and was used to indicate the OM origin here. Nevertheless, the organic carbon and nitrogen molar ratios (TOC/TN) and the stable nitrogen isotopic Composition (delta N-15) were affected by diagenesis and could be the supplementary indicators. The sources of OM were estimated based on the two end-member model. The results showed that in the estuary, sedimentary OM originated from terrestrial and aquatic mixing origins, whereas, OM in coastal sediments was dominantly algae-derived. The accumulation rate of sedimentary OM was analyzed based on Pb-210 dating. Due to the sampling sites and the distinct hydraulic environments, the accumulation rates of TOC, aquatic and terrestrial OC were obviously higher in the estuary than in coastal area. TOC accumulation rates were 18-27 mg cm(-2) y(-1) in the estuary, and 0.84-3.6 mg cm(-2) y(-1) in coastal area. Aquatic OC accumulation rates were 7.9-11.3, 0.8-1.3, and 2.6-3.1 mg cm(-2) y(-1), and terrestrial OC accumulation rates were 9.7-16.3, 0.02-0.14, 0.16-0.42 mg cm(-2) y(-1) in cores 2, 5, 6, respectively. It could be seen from the high accumulation rate of organic matter in the estuary that, when nutrients increased in the river, phytoplankton biomass and productivity would also have increased. As a result, phytoplankton sinking and organic matter sedimentation usually increased with primary productivity, resulting in the observed accumulation rate of aquatic OC in the estuary. Furthermore, terrestrial OC accumulation rates in the estuary and coastal area showed an increasing trend with the age. (C) 2009 Elsevier Ltd. All rights reserved.
部门归属[Zhang, Ling; Yin, Kedong; Zhang, Derong] Chinese Acad Sci, Key Lab Trop Marine Environm Dynam, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Wang, Lu] Ocean Univ China, Dept Marine Geosci, Qingdao 266100, Peoples R China; [Chen, Fanrong; Yang, Yongqiang] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
关键词Sediment Sources Organic Carbon Carbon Isotope Ratio Accumulation Rate Of Sediments Southern China The Pearl River Estuary
学科领域Marine & Freshwater Biology ; Oceanography
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收录类别sci
资助项目LED
WOS记录号WOS:000271697900004
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被引频次:43[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/6067
专题热带海洋环境国家重点实验室(LTO)
通讯作者yolandezhang@gmail.com
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Zhang, L,Yin, KD,Wang, L,et al. The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2009,85(2):190-196.
APA Zhang, L.,Yin, KD.,Wang, L.,Chen, FR.,Zhang, DR.,...&yolandezhang@gmail.com.(2009).The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China.ESTUARINE COASTAL AND SHELF SCIENCE,85(2),190-196.
MLA Zhang, L,et al."The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China".ESTUARINE COASTAL AND SHELF SCIENCE 85.2(2009):190-196.
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