鸭绿江河口西岸潮滩沉积物有机质对流域变化的响应

石勇; 刘志帅; 高建华; 李军; 白凤龙; 汪小勇

doi:10.3969/j.issn.0253-4193.2015.01.012

鸭绿江河口西岸潮滩沉积物有机质对流域变化的响应

doi: 10.3969/j.issn.0253-4193.2015.01.012

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
2.
国家海洋技术中心, 天津 300112
3.
南京大学地理与海洋科学学院, 江苏南京 210093
4.
青岛海洋地质研究所, 山东青岛 266071

基金项目: 国家自然科学基金(40976051,40976036)。

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出版历程
- 收稿日期: 2012-10-13
- 修回日期: 2014-11-02

Variation of sediment organic matter in western tidal flat of Yalu River Estuary and its respond to basin changes

1.
National Ocean Technology Center, Tianjin 300112, China;Nanjing University, Nanjing 210093, China
2.
National Ocean Technology Center, Tianjin 300112, China
3.
Nanjing University, Nanjing 210093, China
4.
Qingdao Institute of Marine Geology, Qingdao 266071, China

摘要

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、δ¹⁵N)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,δ¹⁵N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,δ¹⁵N则用于指示生化条件的改变。柱样的δ¹³C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δ¹⁵N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。
- 潮滩有机质 /
- 流域变化 /
- δ¹³C /
- δ¹⁵N /
- TOC/TN /
- 鸭绿江
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.
- organic matter /
- basin change /
- δ¹³C /
- δ¹⁵N /
- TOC/TN /
- Yalu River

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