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象山港潮滩沉积物有机质分布特征及物源影响分析
徐皓1, 冯佰香2, 李加林3, 何改丽3
1.宁波大学东海研究院;2.宁波大学地理与空间信息技术系;3.宁波大学东海研究院 浙江宁波
摘要:
潮滩是陆海交互影响的重要区域,在陆海物质交换的过程中扮演着重要的角色。象山港位于浙江宁波,是典型的半封闭式港湾,受人类活动影响显著。本文取其重要支港西沪港为研究区,自其潮上带至潮间带采集表层沉积样品,进行TOC、TN和δ13C等测试。分析象山港潮滩有机质分布的空间特征,并估算陆源有机质的贡献率的空间差异,探讨了影响象山港潮滩有机质的物源因素。结果显示:(1)潮滩表层沉积物TOC均值为0.86%,δ13C均值为-23.58‰。在平均海面附近的样品TOC和δ13C均出现异常值,其中TOC约2.3%,而δ13C约-26.44‰,指示有大量陆源有机质在平均海面附近累积。(2)δ13C总体上随高程下降而下降,潮上带平均值为-22.40‰,潮间带平均值为-23.33‰。(3)有机质累积受植被、养殖、污水排放等影响。潮上带和高潮滩表层沉积物受潮滩植被影响显著;平均海面附近样品的δ13C与生活污水和沿岸围塘养殖的δ13C接近,说明象山港潮动力较弱,沿岸人类活动产生的有机质容易在平均海面附近大量累积。
关键词:  潮滩  半封闭港湾  有机质  物源
DOI:10.11693/hyhz20200400120
分类号:
基金项目:NSFC-浙江两化融合联合基金(U1609203),国家自然科学基金(41976209),浙江省自然科学基金(LQ15D020001),
Analysis of source and distribution of organic matters in tidal flat of Xiangshan Bay
Xu Hao,Feng Baixiang,Li Jialin,He Gaili
1.Institute of East China Sea,Ningbo University;2.Department of Geography and Spatial Information Techniques,Ningbo University
Abstract:
Tidal flat takes an important role in LOICZ. Xiangshan bay is a semi-closed bay which located at Ningbo of Zhejiang province and is seriously influenced by human activities. As an important tributary bay of Xiangshan bay, Xihu bay was selected as research area. Surface sedimentary samples were collected from supratidal zone to intertidal zone. Based on the test of TOC, TN and δ13C, distribution of organic matters was revealed and the contribution of terrigenous organic can be estimated. Furthermore, the influence of organic matters’ sources will be discussed. This study indicates that: (1)The mean value of TOC is 0.86%, and the mean value of δ13C is -23.58‰. however, 2.3% of TOC and -26.44‰ of δ13C have been tested in those samples which located at the sea level. It indicates that a large amount of terrestrial organic matter accumulated at the sea level. (2) δ13C is decreasing as the altitude descend. The mean value δ13C in supratidal zone is about -22.40‰, the mean value δ13C in intertidal zone is about -23.33‰. (3) the sources of organic maters were influenced by vegetation, aquaculture, sewage discharge and so on. The sediment in the supratidal zone were influenced by Spartina alterniflora, and the sediment which located nearby sea level were influenced obviously by aquaculture, sewage discharge. This can be ascribed to the weaker hydrodynamic force make organic matters accumulated easier in semi-closed bay.
Key words:  tidal flat  semi-closed bay  organic matters  provenance
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