茅埏岛红树林沉积物有机碳埋藏特征解析

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摘要以茅埏岛北部红树林湿地为研究区域,旨在探究红树林湿地沉积物有机碳埋藏特征和来源.基于放射性同位素(²¹⁰Pb)采用恒定沉积速率模式分析沉积速率(SAR)、有机碳密度、埋藏速率(OCAR)、有机碳潜在来源及贡献率.茅埏岛红树林湿地的沉积速率约为1.8cm/a.沉积物以粉砂和黏土为主,粒径随深度变化基本保持稳定,且过剩²¹⁰Pb活度与深度之间具有较好的相关性,表明沉积环境较为稳定.沉积物有机碳密度平均值为0.66g/cm³,埋藏速率为120.01g/(m²·a).通过碳氮稳定同位素分布特征结合多线性混合模型(IsoSource)可知,沉积物有机碳来源总体以海陆混合来源为主,其中海源占比50.3%,陆源占比33.4%,树源贡献占比16.3%;表层沉积物以陆源和树源输入为主,树源贡献率最高达46.4%.红树林植被组成、成林时间等是影响沉积物有机碳埋藏重要因素.

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	于洋
	水柏年
	吕聪聪
	李滨
	李雪丽
	魏珍
	胡成业

关键词 ：红树林湿地, 有机碳, 沉积物, 埋藏速率

Abstract：The northern mangrove wetlands of Maoshan Island were taken as the study area to investigate the characteristics and sources of organic carbon burial in the sediments. The sedimentation rate (SAR), organic carbon density, burial rate (OCAR), potential sources of organic carbon, and contribution rates were analyzed using the constant sedimentation rate model based on radiogenic isotopes (²¹⁰Pb). The sedimentation rate in the Maoshan Island mangrove wetlands was approximately 1.8cm/year. The sediments were mainly composed of silt and clay, with particle size remaining stable with depth. A good correlation was observed between excess ²¹⁰Pb activity and depth, indicating a stable sedimentary environment. The average organic carbon density of the sediments was 0.66g/cm³, and the burial rate was 120.01g/(m²·a). The distribution characteristics of stable carbon and nitrogen isotopes, combined with the multivariate mixing model (IsoSource), showed that the sources of organic carbon in the sediments were mainly a mixture of marine and terrestrial origins, with marine sources accounting for 50.3%, terrestrial sources for 33.4%, and tree sources contributing 16.3%. Surface sediments were primarily influenced by terrestrial and tree inputs, with the highest contribution rate from tree sources reaching 46.4%. The composition of mangrove vegetation and the time since forest establishment were important factors affecting the burial of organic carbon in the sediments.

Key words： mangrove organic carbon sediments burial rate

收稿日期: 2024-01-30

PACS:

X502

基金资助:国家自然科学基金资助项目(42306188);浙江省自然科学基金资助项目(LQ21C030006);浙江省属高校基本科研业务费资助项目(2021J003);国家级大学生创新创业训练计划项目(202310340058)

作者简介: 于洋(1996-),男,山东泰安人,硕士研究生,主要从事红树林有机碳时空分布、有机碳埋藏特征及其来源研究.发表论文3篇.18863699006@163.com.

引用本文:

于洋, 水柏年, 吕聪聪, 李滨, 李雪丽, 魏珍, 胡成业. 茅埏岛红树林沉积物有机碳埋藏特征解析[J]. 中国环境科学, 2024, 44(8): 4539-4546. YU Yang, SHUI Bo-nian, LV Cong-cong, LI Bin, LI Xue-li, WEI Zhen, HU Cheng-ye. Analysis of crganic carbon burial characteristics in mangrove sediments on Maoyan Island. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4539-4546.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4539

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