检索
E-mail
RSS

作者投稿 主编审稿 专家审稿 远程编辑

热带海洋学报

• • 上一篇    下一篇

北部湾红树林表层沉积物有机质组成分布特征与来源分析

农兰馨1, 2, 曹新星2, 姚立朋2, 陈 娟2, 宋之光2, 黄胜敏2, 黄花妹1, 2   

  1. 1. 南宁师范大学, 地理科学与规划学院, 广西 南宁, 530001

    2. 南宁师范大学, 北部湾环境演变与资源利用教育部重点实验室, 广西 南宁, 530001


  • 收稿日期:2026-06-28 修回日期:2026-09-07 接受日期:2026-09-17
  • 通讯作者: 曹新星
  • 基金资助:

    广西向海经济人才培养支持专项项目(2026XHRC30)；北部湾环境演变与资源利用教育部重点实验开放课题资助(GTEU-KLOP-X1803)；广西高校中青年教师科研基础能力提升项目(校级)(KY26ZQN004)；2025年“八桂之光”访学研修计划(科技人才专项)

Distribution Characteristics and Sources of Organic Matter Composition in Surface Sediments of Mangroves in the Beibu Gulf

NONG Lanxin1,2, CAO Xinxing2,*, YAO Lipeng2, CHEN Juan2, SONG Zhiguang2,*,HUANG Shengmin2 ,HUANG  Huamei1,2    

  1. 1. School of Geographic Sciences and Planning, Nanning Normal University, Nanning, Guangxi 530001, China

    2. Key Laboratory of Environment Change and Resource Use in Beibu Gulf, Ministry of Education, Nanning Normal University, Nanning, Guangxi 530001, China




  • Received:2026-06-28 Revised:2026-09-07 Accepted:2026-09-17
  • Supported by:

     Guangxi Maritime Economy Talents Training Support Special Project(2026XHRC30); Beibu Gulf Environmental Evolution and Resource Utilization Key Experimental Open Project Funded by the Ministry of Education ( GTEU-KLOP-X1803 ); Guangxi Higher Education Middle-aged and Young Teachers Research Foundation Capacity Enhancement Project (KY26ZQN004); 2025 "Bagui Light" Visiting Scholar and Training Program (Special Program for Scientific and Technological Talents)

PDF (PC)

赞

摘要： 本研究通过对北部湾茅尾海与英罗湾两处红树林表层沉积物样品中总有机碳（TOC）、总氮（TN）、总硫（TS）、有机碳与总氮的比值（C/N）、碳氮硫同位素组成（δ13C、δ15N、δ34S）以及有机质正构烷烃组成等的分析，探讨了红树林表层沉积物有机质来源及其区域分布特征。结果表明，茅尾海红树林表层沉积物总有机碳（TOC）、总氮（TN）含量分别为0.40%~1.30%和0.05%~0.16%；英罗湾红树林沉积物为别0.16%~0.84%和0.03%~0.08%；茅尾海沉积物TOC和TN整体高于英罗湾，其差异性可能受地形与水动力条件影响。茅尾海红树林沉积有机质δ13C值为-26.0‰~-24.4‰，英罗湾为-26.5‰~-21.3‰，显示两区域红树林沉积有机质具有陆源和海源混合输入特征，而英罗湾红树林沉积物中海源贡献更高；同时，红树林沉积物中均普遍富集δ¹⁵N（10~14‰），呈现显著的养殖排放与污水污染等人为氮源影响。茅尾海和英罗湾TS含量分别为0.15%~0.38%和0.08%~0.23%，与TOC变化趋势一致；两区域TS/TOC均值高于全球氧化环境平均值，δ³⁴S为−36.72‰~−17.25‰，表明沉积物硫埋藏受微生物硫酸盐还原主导，并受有机质输入及水动力扰动的共同影响。沉积有机质正构烷烃碳数分布范围在C₁₁ 至C₃₃之间，主峰碳为C₂₅-C₂₉，结合TAR、ACL、Paq和CPI等相关参数显示，茅尾海沉积有机质以陆生高等植物输入为主，占比可达~69%；英罗湾沉积有机质则呈现陆源、水生植物混合输入，其中陆生植物贡献可达~52%，水生植物贡献可高达~38%，部分样点呈现石油烃污染指征。应用MixSIAR模型分析显示红树林沉积有机质来源总体呈"陆源（79.6%）>海源（19.3%）>红树林内源（1.1%）"格局。

关键词: 红树林沉积物, 有机碳, 正构烷烃, 碳氮硫同位素, 北部湾

Abstract: This study investigated the sources and regional distribution characteristics of organic matter in mangrove surface sediments from Maowei Sea and Yingluo Bay in the Beibu Gulf by analyzing total organic carbon (TOC), total nitrogen (TN), total sulfur (TS), the ratio of organic carbon to total nitrogen (C/N), carbon, nitrogen, and sulfur isotope composition (δ13C, δ 15N, δ 34S), and the n-alkane composition of organic matter. The results showed that the total organic carbon (TOC) and total nitrogen (TN) contents in the surface sediments of mangroves in Maowei Sea were 0.40% ~ 1.30% and 0.05% ~ 0.16%, respectively; while those in the mangrove sediments of Yingluo Bay were 0.16% ~ 0.84% and 0.03% ~ 0.08%, respectively. The TOC and TN contents in Maowei Sea sediments were generally higher than those in Yingluo Bay, and this difference may be influenced by topographic and hydrodynamic conditions. The δ¹³C values of mangrove sediments in Maowei Sea range from-26.0‰ to -24.4‰, while those in Yingluo Bay range from -26.5‰ to -21.3‰, indicating a mixed input of terrestrial and marine sources. However, the marine contribution is higher in the Yingluo Bay mangrove sediments. Simultaneously, both mangrove sediments are generally enriched in δ¹⁵N (10~14‰), reflecting significant anthropogenic nitrogen source influences such as aquaculture discharge and wastewater pollution. The total sulfur (TS) contents in Maowei Sea and Yingluo Bay are 0.15% ~ 0.38% and 0.08% ~ 0.23%, respectively, consistent with the TOC trend. The average TS/TOC values in both regions are higher than the global average for oxidative environments, with δ³⁴S ranging from -36.72‰ to -17.25‰, indicating that sediment sulfur burial is dominated by microbial sulfate reduction and influenced by both organic matter input and hydrodynamic disturbances. The carbon number distribution of n-alkane in sedimentary organic matter ranges from C₁₁ to C₃₃, with the main peak carbon being C₂₅ ~ C₂₉. Combined with relevant parameters such as TAR, ACL, Paq, and CPI, it is shown that the organic matter in Maowei Bay sediments is mainly inputted by terrestrial higher plants, accounting for ~69%; while the organic matter in Yingluo Bay sediments shows a mixed input of terrestrial and aquatic plants, with terrestrial plants contributing ~52% and aquatic plants contributing up to ~38%. Some samples show signs of petroleum hydrocarbon pollution. Analysis using the MixSIAR model shows that the overall source of organic matter in mangrove sediments follows a pattern of "terrestrial (79.6%) > marine (19.3%) > mangrove endogenous (1.1%)".

Key words: mangrove sediments, organic carbon, n-alkane, carbon, nitrogen, and sulfur isotopes, Beibu Gulf