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学科主题: Marine & Freshwater Biology; Oceanography
题名: The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China
作者: Zhang, L ; Yin, KD ; Wang, L ; Chen, FR ; Zhang, DR ; Yang, YQ
通讯作者: yolandezhang@gmail.com
关键词: sediment sources ; organic carbon ; carbon isotope ratio ; accumulation rate of sediments ; Southern China ; the Pearl River Estuary
刊名: ESTUARINE COASTAL AND SHELF SCIENCE
发表日期: 2009
卷: 85, 期:2, 页:190-196
收录类别: sci
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
项目归属: LED
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.
原文出处: 查看原文
WOS记录号: WOS:000271697900004
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6067
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Recommended Citation:
Zhang, L; Yin, KD; Wang, L; Chen, FR; Zhang, DR; Yang, YQ.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,2009,85(2):190-196
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文件名: The sources and accumulation rate of sedimentary organic matter in the Pearl River Estuary and adjacent coastal area, Southern China .pdf
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