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| 黄河三角洲滨海湿地沉积环境演化与碳的累积 |
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魏梦杰1,2, 叶思源2,3, 丁喜桂2,3, 袁红明2,3, 赵广明2,3, 王 锦2,3
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1.青岛大学 化学化工与环境学院;2.中国地质调查局滨海湿地重点实验室;3.国土资源部海洋油气资源与环境地质重点实验室
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| 摘要: |
| 2007 年在黄河三角洲布设一口23.7 m 深的浅钻(ZK5), 对ZK5 进行沉积学观测及原位密度、总碳、有机碳、Al 和营养元素实验室测试分析, 对ZK5 的沉积物性质、有孔虫种类和地层等进行分析, 将ZK5 自上而下划分为7 个沉积环境, 揭示了滨海湿地地质演化过程。利用AMS14C 测年方法, 结合黄河改道的历史, 运用历史地理学和沉积地质学综合分析的方法对7 个沉积地层进行了年代确定。利用所确定的年代计算了不同沉积环境总碳(TC)和有机碳(Corg)的加积速率。结果表明: TC 和Corg 与各营养元素及沉积物的沉积速率呈很好的线性相关, 沉积物的沉积速率是Corg 和TC加积速率的主控因素。还进一步指出, 虽然现代黄河三角洲TC、Corg 浓度相对较低(质量比分别为9～20 mg/g, 1～4 mg/g), 但由于其高沉积速率(最高可达60 cm/a), Corg 的加积速率高于世界其他高Corg 浓度的湿地, 特别是浅海湿地(如三角洲前缘), 其Corg 加积速率可高达2 102 g/(m2·a)。由此, 可以断言现代黄河三角洲是很好的碳汇地质体。 |
| 关键词: 沉积环境 有机碳 加积速率 营养元素 黄河三角洲 |
| DOI：10.11759/hykx20130131005 |
| 分类号: |
| 基金项目:大地调查项目(1212010611402)；国土资源部公益性行业基金(201111023); 国土资源部海洋油气资源与环境地质重点实验室基金(MRE2012030); 海洋地质保障工程项目( GZH201200503); 国家自然科学基金(41406082) |
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| Carbon sequestration of different sedimentary layers in coastal wetland of the Yellow River Delta |
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| Abstract: |
| This article is based on sedimentary observation of a 23.7 m depth core in the Yellow River Delta set up in 2007 and the mass data was obtained in the laboratory, which include the bulk density, total carbon, organic carbon, and different nutrients. The core is divided into seven different sedimentary layers according to the quality of sediments and foraminifera species in ZK5. Also, the accurate age of each layer is defined by sedimentary geology, historical geography and history of the Yellow River Delta. It turns out that the total carbon and organic carbon represent a good correlation with nutrients and sediments accretion, and the key element influences the accretion of total and organic carbon. In addition, although the concentrations of total and organic (9～20, 1～4 mg/g) carbon are quite low, the concentration of organic carbon accretion is higher than that in other wetlands because of the high deposition rate (the highest rate can be 60 cm/a). Particularly, the carbon accretion of prodelta in ZK5 core is 2102 g/(m2·a). In a word, the modern delta of the Yellow River is a very good and large carbon geological si |
| Key words: sedimentary stratigraphy organic carbon accretion nutrients the Yellow River Delta |