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鸭绿江河口西岸潮滩沉积物有机质对流域变化的响应
引用本文:石勇,刘志帅,高建华,李军,白凤龙,汪小勇.鸭绿江河口西岸潮滩沉积物有机质对流域变化的响应[J].海洋学报,2015,37(1):115-123.
作者姓名:石勇  刘志帅  高建华  李军  白凤龙  汪小勇
作者单位:1.国家海洋技术中心, 天津 300112;南京大学 地理与海洋科学学院, 江苏 南京 210093
基金项目:国家自然科学基金(40976051,40976036)。
摘    要:河流颗粒有机质提供了陆地碳循环的重要信息以及人类活动的记录,通过河口地区沉积物有机质组成,可反映流域变化及海陆间相互作用。2010-2011年分两次于鸭绿江河口西岸潮滩采集柱样4根及表层样23个。对样品进行有机质碳氮总量(TOC、TN)、碳氮同位素(δ13C、δ15 N)及沉积物粒度测试。分析结果表明,由河口向西,有机质受改造程度加深且来源逐渐复杂化,致TOC/TN与δ13C的相关性逐渐降低,δ15 N与沉积物粒度的相关性也随之降低。文中以δ13C为主线探讨沉积物有机质的来源及运移,TOC/TN作为辅助,δ15 N则用于指示生化条件的改变。柱样的δ13 C分布与河流入海输沙密切相关,水库对入海泥沙的拦截,致河口潮滩沉积速率减缓,从而增加了沉积物中海源有机质的含量,δ13C随之增加。潮滩西侧柱样的δ15 N增加指示了生活工业污水的大量排放。此外,表层样δ13C分布的方向性,指示了西水道门口处的快速堆积及潮下带物质的向岸运移,并在西岸潮滩向岸一侧富集。

关 键 词:潮滩有机质    流域变化    δ13C    δ15N    TOC/TN    鸭绿江
收稿时间:2012/10/13 0:00:00
修稿时间:2014/11/2 0:00:00

Variation of sediment organic matter in western tidal flat of Yalu River Estuary and its respond to basin changes
Shi Yong,Liu Zhishuai,Gao Jianhu,Li Jun,Bai Fenglong and Wang Xiaoyong.Variation of sediment organic matter in western tidal flat of Yalu River Estuary and its respond to basin changes[J].Acta Oceanologica Sinica (in Chinese),2015,37(1):115-123.
Authors:Shi Yong  Liu Zhishuai  Gao Jianhu  Li Jun  Bai Fenglong and Wang Xiaoyong
Affiliation:1.National Ocean Technology Center, Tianjin 300112, China;Nanjing University, Nanjing 210093, China2.National Ocean Technology Center, Tianjin 300112, China3.Nanjing University, Nanjing 210093, China4.Qingdao Institute of Marine Geology, Qingdao 266071, China
Abstract:Riverine particle organic matter (POM) contains key information about terrestrial carbon cycle,and human activities. The basin changes and interaction,between land and sea,can be reflected by the variation of organic matter in sediment from estuary. Four sediment cores and 23 surface samples were collected in tidal flat of west bank of Yalu Estuary in twice from 2010 to 2011. The elemental and C-and N-isotopic compositions of organic matter (OM) were determined,together with sediment grain size. The analysis results show that relationship between TOC/TN and δ13C decrease,as well as correlation between δ15N and sediment grain size from estuary to west,indicating that reconstruction degree of OM get further and the source of OM get complicated. We use δ13C to analysis OM's source and its transport as the principal line,TOC/TN as auxiliary,and use δ15N to evaluate ecological environment. The variations of δ13C in sediment cores are closely related with river sediment load. Intercepted by dams,the sediment load decreased gradually,causing the deposition rate of tidal flat getting slow,and increasing the marine OM content in sediment. Variation of δ15N in core sediment indicates the increasing sewage discharge. Otherwise,the rapid deposition rate in West Chanel Estuary reduced the δ13C in surface sediments from land to sea. And the material,transported from sub-tidal and enriched in inter-tidal,caused the δ13C increasing in landward direction in west tidal flat of Yalu Estuary.
Keywords:organic matter  basin change  δ13 C  δ15 N  TOC/TN  Yalu River
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