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    王春禹,姚鵬,趙彬.長江口表層沉積物中正構烷烴的高分辨分布特征及有機碳來源解析[J].海洋學報,2020,42(10):1-13
    長江口表層沉積物中正構烷烴的高分辨分布特征及有機碳來源解析
    High-resolution distribution of n-alkanes and source apportionment of organic carbon in surface sediments of the Changjiang River Estuary
    投稿時間:2020-02-08  修訂日期:2020-05-02
    DOI:10.3969/j.issn.0253-4193.2020.10.001
    中文關鍵詞:  長江口  沉積有機碳  正構烷烴  高分辨  來源和分布
    英文關鍵詞:Changjiang River Estuary  sedimentary organic carbon  n-alkanes  high-resolution  source and distribution
    基金項目:國家自然科學基金重點國際(地區)合作研究項目(41620104001);國家自然科學基金面上項目(41676063)。
    作者單位E-mail
    王春禹 中國海洋大學 海洋化學理論與工程技術教育部重點實驗室,山東 青島 266100  
    姚鵬 中國海洋大學 海洋化學理論與工程技術教育部重點實驗室,山東 青島 266100
    青島海洋科學與技術試點國家實驗室 海洋生態與環境科學功能實驗室,山東 青島 266237 
    yaopeng@ouc.edu.cn 
    趙彬 中國海洋大學 海洋化學理論與工程技術教育部重點實驗室,山東 青島 266100  
    摘要點擊次數: 1787
    全文下載次數: 5106
    中文摘要:
          于2014年3月對長江口及鄰近海域的表層沉積物進行了高分辨率采樣,分析了沉積物粒級組成、比表面積、總有機碳含量及其穩定碳同位素組成(δ13C)、正構烷烴及其相關分子指標,討論了此區域沉積有機碳和正構烷烴的高分辨分布特征,并結合基于主成分分析-蒙特卡洛模擬的三端元混合模型,對沉積有機碳的來源進行了定量解析。結果表明,長江口及其鄰近海域表層沉積物中總有機碳含量為0.45%±0.16%,近岸泥質區總有機碳含量較高,外海砂質區含量較低??傉龢嬐闊N(C14-C35)的絕對含量和相對于總有機碳的含量分別為(1.42±0.73) μg/g和(0.34±0.21) mg/g。泥質區以長鏈正構烷烴占優勢,具有較強的奇碳優勢;砂質區以短鏈正構烷烴占優勢,且具有一定的偶碳優勢。長江輸入、老黃河口輸入、閩浙沿岸小型河流輸入和水動力分選等因素制約了正構烷烴的輸運和分布特征。模型結果顯示此區域沉積有機碳來自海源、土壤和高等植物的混合輸入,其中以海源為主,其貢獻為42.70%±18.18%,由陸地向外海貢獻逐漸升高,其次是土壤和高等植物,其貢獻分別為28.99%±15.37%和28.31%±17.12%。在水動力分選作用的影響下,兩種陸源有機碳在入海之后的輸運過程中存在明顯的分異,土壤有機碳主要與細顆粒物結合,并沿閩浙沿岸向南輸運,而高等植物來源有機碳則在長江口存在東北方向的輸運。
    英文摘要:
          Surface sediments were collected by high-resolution sampling from the Changjiang River Estuary and its adjacent shelf in March, 2014. Grain size composition, Specific Surface Area (SSA), Total Organic Carbon (TOC) and stable carbon isotope composition (δ13C), n-alkanes and its related indices in sediments were analyzed to discuss the high-resolution distribution patterns of sedimentary organic carbon (OC) and n-alkanes in this region. A three end-members mixing model based on Principal Component Analysis (PCA) and Monte-Carlo Simulation was constructed to characterize the sources of sedimentary OC quantitatively. The results showed that TOC contents were 0.45%±0.16%, which were relatively higher in coastal mud area than offshore sandy area. Absolute contents (Σn-Alk) and relative contents (Σn-Alk/TOC) of total n-alkanes (C14 to C35) were (1.42±0.73) μg/g and (0.34±0.21) mg/g , respectively. There was a strong odd to even carbon preference of long-chain n-alkanes in muddy sediments, while there was an even to odd carbon preference of short-chain n-alkanes in sandy area. Inputs from the Changjiang River, the Old Yellow River Estuary and small rivers in the Zhe-Min coasts and hydrodynamic sorting restricted the transport and dispersal patterns of n-alkanes. The results of the three end-members mixing model indicated a mixture input of marine, soil and higher plant derived OC in this region. Among them, sedimentary OC was dominated by marine source (42.70%±18.18%), increasing from coast to outer sea gradually. Contributions of soil OC and higher plant OC were 28.99%±15.37% and 28.31%±17.12%, respectively. Influenced by hydrodynamic forces, obvious differentiation of these two terrestrial OC pools occurred during transport after entering into ocean. Soil OC was mainly associated with fine grains, and was transported southward along the Zhe-Min coast, while higher plant derived OC was mainly transported along northeast direction in the Changjiang River Estuary.
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