长江口—杭州湾及其邻近海域不同粒级沉积有机碳分布特征

doi:10.11867/j.issn.1001-8166.2009.11.1202

地球科学进展 ›› 2009, Vol. 24 ›› Issue (11): 1202 -1209. doi: 10.11867/j.issn.1001-8166.2009.11.1202

章伟艳 ^1，2，金海燕 ^1，3，张富元 ^1，2，赵国军 ⁴，杨克红 ^1，2,李宏亮 ^1，3，白有成 ^1，3，高为利 ¹

1.国家海洋局第二海洋研究所，浙江杭州 310012; 2.国家海洋局海底科学重点实验室，浙江杭州310012; 3.国家海洋局海洋生物地球化学与生态系统重点实验室，浙江杭州310012;4.浙江省水利水电设计研究院，浙江杭州310002

收稿日期:2009-06-12 修回日期:2009-08-28 出版日期:2009-11-10
通讯作者: 章伟艳（1972-），女，浙江诸暨人，副研究员，主要从事海洋沉积学和海洋矿产资源评价研究. E-mail:zwy885@163.com
基金资助:
-浙江省自然科学基金项目“浙江海域有机碳在不同粒径沉积物中的来源、分布和迁移规律”（编号：Y506145）；国家自然科学基金项目“沉积色素对近百年来东海生态环境变化指示研究”（编号：40403013）；国家海洋局第二海洋研究所基本科研业务费专项资金项目“长江口—东海营养物质变动对底栖生态和沉积碳埋藏的影响”（编号：JT0707）；“浙江省重要海洋资源及其承载力综合评价”（编号：ZJ908-02-01）共同资助.

Organic Carbon Distribution in the Yangtze River Estuary-Hangzhou Bay and Its Adjacent Sea Area

ZHANG Weiyan ^1,2, JIN Haiyan ^1,3, ZHANG Fuyuan ^1,2, ZHAO Guojun ⁴,YANG Kehong ^1,2, LI Hongliang ^1,3,BAI Youcheng ^1,3,GAO Weili ¹

1.Second Institute of Oceangraphy of SOA, Hangzhou310012, China;2.Laboratory of Submarine Geosciences, SOA, Hangzhou310012, China;3.Laboratory of Marine Ecosystem and Biogeochemistry of SOA, Hangzhou310012,China;4.Water Conservancy and Hydropower Survey and Design Institute of Zhejiang Province, Hangzhou310002,China

Received:2009-06-12 Revised:2009-08-28 Online:2009-11-10 Published:2009-11-10

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通过对长江口、杭州湾、舟山海域及东海陆架4个海区表层沉积物样品的粒度敏感组分分析，发现东海陆架与长江口具有相似的三级组分物质组成，杭州湾与舟山海域具有相似的两级组分物质组成。综合4个区域粒级组分分布特征，采用湿分法将4个海域表层沉积物样品分成6个粒级：<0.004 mm，0.004~0.025 mm，0.025~0.063 mm，0.063~0.125 mm，0.125~0.250 mm和>0.250 mm，分别提取各级组分和全样进行有机碳及同位素测试。定量分析各级组分有机碳含量、来源及物质组分，除杭州湾海域粗粒级外，基本上<0.004 mm的粘土组分有机碳含量最高；富集在杭州湾海域粗颗粒中的有机质主要来源于陆源植物碎屑。沉积物颗粒大小、物质组成类型是不同粒级有机质富集的主要控制因素。

关键词: 沉积物, 粒度敏感组分, 有机碳, 有机碳同位素

A study of environmentally sensitive grain-size population was used by the grain size class vs standard deviation values of the surface sediment samples in the Yangtze River Estuary, Hangzhou Bay, Zhoushan archipelago sea area and the East China Sea shelf. Results indicated that there were three similar grain size populations between the East China Sea shelf and the Yangtze River estuary and two similar populations between the Hangzhou Bay and the Zhoushan archipelago sea area. According to the environmentally sensitive grain-size population, wet sieving was performed to separate the four area sediments into six size fractions (>0.250 mm, 0.125~0.250 mm, 0.063~0.125 mm, 0.025~0.063 mm, 0.004~0.025 mm, and <0.004 mm). Each of these size fractions and the bulk samples were analyzed for the total organic carbon(TOC) and stable organic carbon isotopic ratios(δ¹³C org). The further quantitative analysis of TOC and δ¹³C org for each fraction indicated that there was the highest TOC content in the <0.004 mm fraction except the coarse size fractions of the Hangzhou bay where they were rich in the organic matter from the terrestrial source plant debris, and the particle size and type of the sediment component played important role in the organic matter distribution.

Key words: Sediment, Grain size sensitive compositions, Total organic carbon, Stable carbon isotopes

中图分类号:

P731.16

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