地理学报 ›› 2008, Vol. 63 ›› Issue (5): 553-560.doi: 10.11821/xb200805011

• 沉积环境 • 上一篇    

西江河口段溶解无机碳稳定同位素组成的时空变化

焦树林1,2, 陶贞1, 高全洲1, 刘昆1, 佘建伟1, 丁健1, 刘祖发1   

  1. 1. 中山大学地理科学与规划学院, 广州510275;
    2. 贵州师范大学地理与生物科学学院, 贵阳550001
  • 收稿日期:2007-12-28 修回日期:2008-02-03 出版日期:2008-05-26 发布日期:2010-08-03
  • 通讯作者: 高全洲, E-mail: eesgqz@mail.sysu.edu.cn E-mail:eesgqz@mail.sysu.edu.cn
  • 作者简介:焦树林(1969-), 男, 博士研究生, 中国地理学会会员, 从事流域地表过程与环境变化研究。 E-mail:jiaoshulin@gznu.edu.cn
  • 基金资助:

    国家自然科学基金(40671027; 40471120); 广东省自然科学基金(7003669); 高等学校博士学科点专项科研基 金(20040558025) 和教育部新世纪优秀人才支持计划(NCET)资助

Spatio- temporal Variation of the Stable Isotopic Composition of River ine Dissolved Inorganic Carbon of the Xijiang Inner Estuary

JIAO Shulin1,2, TAO Zhen1, GAO Quanzhou1, LIU Kun1, SHE Jianwei1, DING Jian1, LIU Zufa1   

  1. 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China;
    2. School of Geography and Biology, Guizhou Normal University, Guiyang 550001, China
  • Received:2007-12-28 Revised:2008-02-03 Online:2008-05-26 Published:2010-08-03
  • Supported by:

    National Natural Science Foundation of China, No.40671027; No.40471120; Guangdong Provincial Natural Science Foundation of China, No.7003669; Specialized Research Fund for the Doctoral Program of Higher Education, No.20040558025; Program for New Century Excellent Talents in University (NCET)

摘要:

从2006 年9 月至2007 年6 月间对西江河口段溶解无机碳稳定同位素组成(δ13CDIC) 及 其相关的水体理化参数进行了一个水文年的季节性采样调查。夏、秋两季δ13CDIC 平均值(-13. 91‰、-13.09‰) 小于春、冬季节(-11.71‰、-12.26‰), 呈现出明显的季节性。δ13CDIC 与温度 呈负相关(p = 0.000; r = -0.646), 而与氧化还原电位正相关(p = 0.000; r = 0.569), 表明河段 表层水体δ13CDIC 受到季节性变化的水体理化性质等河道有机质氧化分解条件的控制; 夏季洪水期δ13CDIC 与航测距离呈正相关, 而春季枯水期的δ13CDIC 与航测距离负相关。δ13CDIC 的这种时空变异证明了研究河段河- 海作用过程影响了水体的理化性状进而控制了河道表层水体DIC 的性质。研究河段δ13CDIC 的上述时空分布规律与流域所处的地理环境关系密切, 汛期的夏季受陆源有机质的强烈分解作用的影响, DIC 的同位素组成向海洋方向变轻; 枯期的春季因海洋作用加强以及咸潮的入侵, 河道DIC 的同位素组成向海洋方向变重。

关键词: 西江河口段, 溶解无机碳, 稳定碳同位素

Abstract:

For researching the spatio-temporal variation of the riverine dissolved inorganic carbon (DIC) isotopic characteristic, we carried out a survey throughout the hydrologic year which δ13CDIC of the surface water and its physiochemical parameter were examined along the Xijiang Inner Estuarine waterway from the autumn of September 2006 to the summer of June 2007. There were striking seasonal variations on the average δ13CDIC, as the average δ13CDIC in summer (-13.91‰) or in autumn (-13.09‰) was much less than that in spring (-11.71‰) or in winter (-12.26‰ ). The riverine δ13CDIC was controlled by decomposed condition of the riverine organic matter linking the seasonal variation of the physiochemical parameter in the surface water according to the correlation analysis which indicated notable relation between δ13CDIC and water temperature (p = 0.000; r = -0.569) or between δ13CDIC and oxide-reduction potential (p = 0.000; r = 0.646). The striking positive correlation between δ13CDIC and the sampling distance occurred in the summer high flow, while striking negative correlation occurred in the spring low flow, indicating that river-sea interaction influenced water physiochemical parameter and controlled riverine DIC property in the survey waterway. In view of the riverine δ13CDIC decreasing for the decomposition of the terrestrial organic matter in rainy season in summer and increasing for the briny invaded zone extending in dry season in spring along the waterway from the Makou gauge station to the Modaomen outlet, the δ13CDIC spatio-temporal variation was closely related to the geographical environment of the Xijiang basin.

Key words: Xijiang Inner Estuary, dissolved inorganic carbon, stable isotopic carbon