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长江古河谷早中全新世沉积物碳埋藏通量与来源解析

苟富刚

苟富刚. 长江古河谷早中全新世沉积物碳埋藏通量与来源解析[J]. 海洋学报,2023,45(4):95–108 doi: 10.12284/hyxb2023019
引用本文: 苟富刚. 长江古河谷早中全新世沉积物碳埋藏通量与来源解析[J]. 海洋学报,2023,45(4):95–108 doi: 10.12284/hyxb2023019
Gou Fugang. Analysis of carbon burial fluxes and sources in early to middle Holocene sediments of the Changjiang River palaeo-valley[J]. Haiyang Xuebao,2023, 45(4):95–108 doi: 10.12284/hyxb2023019
Citation: Gou Fugang. Analysis of carbon burial fluxes and sources in early to middle Holocene sediments of the Changjiang River palaeo-valley[J]. Haiyang Xuebao,2023, 45(4):95–108 doi: 10.12284/hyxb2023019

长江古河谷早中全新世沉积物碳埋藏通量与来源解析

doi: 10.12284/hyxb2023019
基金项目: 中国地质调查局项目(1212011220005);江苏省自然资源厅项目(JSZRHYKJ202106)
详细信息
    作者简介:

    苟富刚(1985-),男,高级工程师,主要从事特殊土体和环境地质方面的研究工作。E-mail: goufugang@foxmail.com

  • 中图分类号: P736.21+2;P343.5

Analysis of carbon burial fluxes and sources in early to middle Holocene sediments of the Changjiang River palaeo-valley

  • 摘要: 为了研究长江古河谷地区早中全新世沉积物的碳埋藏速率及来源,进行了ZK1孔沉积物总有机碳(TOC)、总氮(TN)及δ13C的测定,结合AMS14C(植物碎屑、贝壳)测年、有孔虫及粒度数据,分析了长江古河谷碳埋藏的时空分布特征与TOC来源。采用历史地理学、沉积地质学结合测年数据进行了年代地层划分,自下而上分别为U1潮汐河道、U2河口湾、U3潮流砂脊和U4前三角洲。沉积物受到水深、径流、河口余环流、潮流、波浪、风暴与再矿化等作用或因素影响,TOC平均值为0.41%,低于长江河口表层沉积物基准值0.46%。ZK1碳埋藏通量(TOCBF)介于7.4~110.5 g/(m2·a)之间,差异较大。TOCBF数值主要受控于沉积速率。δ13C与TOC/TN(C/N) 投影点结果表明,TOC来源表现为多源特征,且整体表现为偏陆源特征。C/N与δ13C线性拟合相关性高,适合采用C/N与δ13C进行TOC来源的定量分析。基于C/N与δ13C采用三端源模型进行了TOC来源分析。U2、U3沉积期处于全新世大暖期,其海源碳与陆源碳较U1、U2沉积单元高,这主要与海洋、陆地初级生产力的提高有关。ZK1海洋浮游植物对TOC的贡献量平均值为31%。河口浮游植物对TOC的贡献量平均值为31%。陆源有机碳对TOC的贡献量平均值为38%。整体来看,陆源有机碳的贡献量大于河口浮游植物与海洋浮游植物的贡献量,这与图解法的分析结果基本一致。
  • 图  1  中国东部陆架区海流分布示意图及采样点位置(据文献[33-34]修改 )

    Fig.  1  The distribution of currents in the eastern shelf area of China and the location of sampling sites (modified from references [33-34])

    图  2  ZK1孔沉积环境划分

    Fig.  2  Deposition environment division of ZK1 hole

    图  3  有机碳含量与有机碳沉积通量分布特征

    Fig.  3  TOC and TOCBF distribution characteristics

    图  4  不同沉积单元碳通量特征

    Fig.  4  Carbon flux characteristics of different sedimentation units

    图  5  有机碳与总氮拟合特征

    Fig.  5  TOC and TN fitting characteristics

    图  6  细菌、藻类、水体与ZK1孔中δ13C与C/N特征(根据文献[68]修改)

    Fig.  6  Characteristics of δ13C and C/N in bacteria, algae, water column and ZK1 hole (modified from reference [68])

    图  7  长江口不同沉积区域表层沉积物与ZK1孔沉积物δ13C与C/N特征[12-20]

    Fig.  7  Characteristics of δ13C and C/N of surface sediments and ZK1 hole sediments in different depositional areas of the Changjiang River Estuary[12-20]

    图  8  C/N与δ13C线性拟合图

    Fig.  8  C/N with δ13C linear fit plot

    图  9  有机碳来源占比分析

    Fig.  9  Analysis of organic carbon sources as a percentage

    图  10  ZK1孔土体沉积时的水深变化

    海平面数据来自文献[74-75],气温曲线来自文献[76]

    Fig.  10  Water depth variation during deposition of ZK1 hole

    Sea level data cited from the references [74-75], temperature curves cited from the reference [76]

    表  1  ZK1孔AMS14C年代序列

    Tab.  1  AMS14C chronological sequence of ZK1 hole

    样品编号深度/m岩性测年材料校正年龄/(cal a BP)
    ZK1-111.5灰色粉细砂夹粉质黏土植物碎屑2 833
    ZK1-228.7灰色泥砂互层贝壳4 733
    ZK1-334.2灰色泥砂互层贝壳5 165
    ZK1-436.8灰色泥砂互层贝壳5 415
    ZK1-544.4灰色粉砂与黏土互层植物碎屑9 143
    ZK1-655.0灰色粉细砂与黏土互层植物碎屑9 790
    ZK1-757.8灰色细砂与粉质黏土互层贝壳10 450
    ZK1-863.7灰色粉质黏土夹粉砂螺壳12 230
    下载: 导出CSV

    表  2  不同沉积单元有机碳与总氮拟合特征

    Tab.  2  TOC and TN fitting characteristics of different sedimentation units

    沉积单元拟合式相关
    系数
    TN平
    均值/%
    拟合式截距与TN
    平均值的比值/%
    全部样本y = 0.063 7x + 0.029 20.7280.05553
    U1y = 0.059x + 0.029 10.8480.05652
    U2y = 0.034 5x + 0.039 30.3020.05275
    U3y = 0.105 4x + 0.015 70.7510.05927
    U4y = –0.022 9x + 0.056 70.1920.045126
    下载: 导出CSV
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  • 收稿日期:  2022-06-07
  • 修回日期:  2022-08-23
  • 网络出版日期:  2023-02-01
  • 刊出日期:  2023-03-31

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