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    仙桃地区关键带生态演化与碳埋藏

    郭森 顾延生 丁俊傑 田文 伦子健

    郭森, 顾延生, 丁俊傑, 田文, 伦子健, 2017. 仙桃地区关键带生态演化与碳埋藏. 地球科学, 42(5): 707-715. doi: 10.3799/dqkx.2017.058
    引用本文: 郭森, 顾延生, 丁俊傑, 田文, 伦子健, 2017. 仙桃地区关键带生态演化与碳埋藏. 地球科学, 42(5): 707-715. doi: 10.3799/dqkx.2017.058
    Guo Sen, Gu Yansheng, Ding Junjie, Tian Wen, Lun Zijian, 2017. Evolution of Eco-Environment and Carbon Burial of Critical Zones in Xiantao Area, Hubei Province. Earth Science, 42(5): 707-715. doi: 10.3799/dqkx.2017.058
    Citation: Guo Sen, Gu Yansheng, Ding Junjie, Tian Wen, Lun Zijian, 2017. Evolution of Eco-Environment and Carbon Burial of Critical Zones in Xiantao Area, Hubei Province. Earth Science, 42(5): 707-715. doi: 10.3799/dqkx.2017.058

    仙桃地区关键带生态演化与碳埋藏

    doi: 10.3799/dqkx.2017.058
    基金项目: 

    中国地质调查局项目 No.12120114069301

    详细信息
      作者简介:

      郭森(1992-),女,硕士研究生,从事第四纪地质与环境演化学习研究.ORCID:0000-0003-2719-2877.E-mail: ayguosen123@163.com

      通讯作者:

      顾延生,ORCID:0000-0001-6620-1946.E-mail: ysgu@cug.edu.cn

    • 中图分类号: P66

    Evolution of Eco-Environment and Carbon Burial of Critical Zones in Xiantao Area, Hubei Province

    • 摘要: 仙桃地区湖群不断萎缩,水体富营养化水平和湿地沉积物重金属含量持续升高,江汉湖群生态系统日益脆弱,加强对该地区生态环境演化研究、分析人类活动和富营养化对湖泊生态系统的影响、探究该地区不同沉积环境的碳埋藏规律等显得尤为重要.在对江汉平原重点地区(仙桃彭场镇幅和脉旺咀幅)第四纪地质调查的基础上,选取研究区大型渔场、小型鱼塘、沟滩、湖泊、水稻田、泄洪道、旱地、汉水阶地8种不同沉积环境的16个关键带点位,分别测定了其表层及浅层钻孔沉积物的色素、TOC(total organic carbon,总有机碳)与TN(total nitrogen,总氮).表层沉积物TOC含量反映了研究区南部多湖泊区域有机碳埋藏量较高,而北部冲、洪积成因环境相对较低,与色素、TN所指示的人类活动强度和富营养化水平相吻合.湿地浅层钻孔沉积物碳埋藏速率变化整体表现为升高趋势,与色素所指示的湖泊富营养化的趋势相吻合;不同沉积环境碳埋藏速率差异较大,最高为大型渔场77.71 g·m-2·a-1、最低为汉水阶地3.61 g·m-2·a-1.研究结果表明,受到人类活动影响,湖相沉积物中碳埋藏量相对较高,湖泊碳汇功能不断增强,这对江汉平原关键带碳循环研究具有重要意义.

       

    • 图  1  研究区及钻孔位置

      Fig.  1.  The location of the study area and core sites

      图  2  AMS14C测年随深度的变化

      Fig.  2.  AMS 14C dating and depth of the boreholes

      图  3  调查区关键带表层沉积物色素、TN与TOC分布

      CD.叶绿素,TC.总胡萝卜素,CD/TC.叶绿素/总胡萝卜素,Myx.蓝藻叶黄素,Osc.颤藻蓝素,Osc/ Myx.颤藻蓝素/蓝藻叶黄素,TN.总氮,TOC.总有机碳,C/N.碳氮比;图 3各图的比例尺1:50 000

      Fig.  3.  Distribution of pigments, TN and TOC in the surface sediments of critical zones in Xiantao

      图  4  关键带沉积物色素、TN以及TOC含量变化

      a.CZ-MW-9钻孔;b.CZ-PC-16钻孔;c.CZ-PC-17钻孔

      Fig.  4.  Changes of pigments, TN and TOC in the sediment of critical zones in Xiantao

      图  5  不同沉积环境下碳埋藏速率的变化

      Fig.  5.  Changes of carbon burial in different depositional environments

      表  1  研究区沉积物AMS14C定年数据

      Table  1.   AMS14C dating in survey region

      序号 室内编号 深度(m) 14C年龄(a BP) 2 Sigma校正(Cal a BP)
      1 JH001-003 3 2 550±30 2 750~2 710
      2 JH001-012 12 9 640±30 10 930~1 080
      3 JH002-007 7 6 460±30 7 555~7 545
      4 JH002-012 12 10 020±30 11 370~1 365
      5 CZ-MW-I-70 7 1 800±30 1 820~1 690
      下载: 导出CSV

      表  2  关键带典型沉积环境与碳埋藏

      Table  2.   Typical depositional environments and carbon burial of the critical zones

      采样点 沉积类型 深度(m) 岩心碳埋藏
      总量(g)
      平均埋藏速率
      (g·m-2·a-1)
      CZ-MW-1 阶地 6.0 25.24 3.61
      CZ-MW-2 旱地 1.3 47.20 5.55
      CZ-MW-7 泄洪道 0.8 21.29 6.51
      CZ-PC-3 水稻田 0.9 146.10 24.82
      CZ-PC-4 水稻田 0.8 104.46 19.96
      CZ-PC-17 滩地 0.4 124.19 37.97
      CZ-MW-8 沟渠 0.3 130.27 49.78
      CZ-PC-12 沟渠 0.5 149.01 40.07
      CZ-MW-9 湖泊 0.5 121.92 31.06
      CZ-PC-16 湖泊 0.5 147.29 37.53
      CZ-PC-13 鱼塘 0.3 68.08 26.02
      CZ-MW-14 鱼塘 0.1 44.26 45.10
      CZ-PC-15 鱼塘 0.1 75.65 77.09
      CZ-PC-18 鱼塘 0.3 148.88 56.90
      CZ-MW-10 渔场 0.3 186.22 71.17
      CZ-PC-11 渔场 0.3 203.35 77.71
      下载: 导出CSV
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