铁山港红树林湿地沉积物有机碳来源解析及其埋藏通量

杨奕昕; 张芬芬; 任旭; 杜金秋; 廖日权; 杜金洲

doi:10.12284/hyxb2025056

铁山港红树林湿地沉积物有机碳来源解析及其埋藏通量

doi: 10.12284/hyxb2025056

杨奕昕^1,,
张芬芬^1, ,,
任旭¹,
杜金秋^{2, 3},
廖日权³,
杜金洲¹

1.
华东师范大学河口海岸全国重点实验室，上海 200241
2.
国家海洋环境监测中心，辽宁大连 116023
3.
北部湾大学海洋学院，广西北部湾海洋环境变化与灾害研究重点实验室，平陆运河河口海湾生态系统广西野外科学观测研究站，广西钦州，535011

基金项目: 国家重点研发计划(2022YFE0209300)；广西北部湾海洋环境变化与灾害研究重点实验室（北部湾大学）开放课题(2022KF003)。

详细信息

作者简介:
杨奕昕（1997—），女，宁夏回族自治区银川市人，主要研究河口环境化学。E-mail：kaaaaaa1x@163.com

通讯作者:
张芬芬，研究员，博士生导师，主要研究碳的生物地球化学循环，环境记录与全球变化。E-mail: ffzhang@sklec.ecnu.edu.cn

中图分类号: P736.21
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出版历程
- 收稿日期: 2024-12-28
- 修回日期: 2025-02-25
- 网络出版日期: 2025-04-11
- 刊出日期: 2025-05-30

Historical variation in sources of sedimentary organic carbon and burial fluxes in mangrove wetlands of Tieshangang Bay

Yang Yixin^1
,,
Zhang Fenfen^{1
, ,},
Ren Xu¹,
Du Jinqiu^{2, 3},
Liao Riquan³,
Du Jinzhou¹

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
2.
National Marine Environment Monitoring Centre, Dalian 116023, China
3.
Pinglu Canal and Beibu Gulf Coastal Ecosystem Observation and Research Station of Guangxi, Guangxi Key Laboratory of Marine Environmental Change and Disaster in Beibu Gulf, College of Marine Sciences, Beibu Gulf University, Qinzhou 535011, China

摘要

摘要: 红树林湿地是高效的滨海蓝色碳汇，在调节全球碳循环中发挥着重要的作用。本研究借助沉积物的粒度、总有机碳（TOC）与总氮（TN）的比值（TOC/TN）、有机碳同位素（δ¹³C）和²¹⁰Pb年代学等相关参数，研究广西铁山港红树林湿地有机碳（OC）来源、沉积物沉积通量、OC埋藏通量的时间变化趋势。结果表明：沉积物粒度以粉砂、砂为主，TOC含量和δ¹³C变化范围分别为0.26%～3.96%、−27.4‰～−21.4‰，TOC、TN、δ¹³C具有较好的一致性。铁山港红树林湿地OC来源中陆源占35.0%，海源占30.5%，红树林源占34.5%。在100年来沉积物有机碳通量平均值为87.6 g/(m²·a)，0～50 cm区间的沉积物碳储量占沉积物柱中（95 cm）总储量的65.3%。自1961年以后，因水库大坝建设，沉积物沉积通量总体减小；1961−1999年间，由于气候及流域周围人类干扰等因素，导致更多陆源有机碳的输入和埋藏；1999−2020年，极端天气和自然因素下，红树林湿地遭破坏退化，从而降低了TOC含量及OC埋藏通量；2010年以来，沉积物中TOC含量增加，这可能与其含水量较高、凋落物累积和根系生长有关，OC来源以红树林源的贡献为主。
- 红树林湿地 /
- 有机碳 /
- 沉积记录 /
- 来源与埋藏 /
- 铁山港
Abstract: Mangrove wetlands are efficient coastal blue carbon sinks and play an important role in regulating the global carbon cycle. In this study, using grain size distribution, total organic carbon / total nitrogen (TOC/TN) ratio, δ¹³C values, and²¹⁰Pb chronological parameter, we investigated the sources of organic carbon (OC) and the temporal trends in sediment deposition and OC burial fluxes in the mangrove wetland of Tieshangang Bay, Guangxi. The results indicated that the sediment grain size was dominated by silt and sand, with TOC content and δ¹³C ranging from 0.26% to 3.96% and from −27.4‰ to −21.4‰, respectively. There was a strong correlation between TOC, TN, and δ¹³C values. The sedimentary organic matter in Tieshangang Bay had mainly a mixed signature with an average terrigenous contribution of 35.0%, marine sources 30.5% and mangrove contributions 34.5%, respectively. The average sediment OC flux over the past 100 years is 87.6 g/(m²·a), and the carbon storage in sediments over the upper 50 cm can account for 65.3% of the total storage over the 95 cm depth. After 1961, there was a general decrease in sediment flux due to the construction of reservoir dams. Between 1961 and 1999, more terrestrial sources of OC were imported and buried due to climate and human disturbances around the watershed. Between 1999 and 2020, mangrove wetlands were destroyed and degraded due to extreme weather and natural factors. Degradation of mangrove wetlands under extreme weather and natural factors reduced the TOC content and OC burial fluxes. Since 2010, TOC content in the sediments has increased, probably due to higher water content, accumulation of litter and root growth. The OC source is dominated by the contribution from mangrove sources.
- mangrove wetlands /
- organic carbon /
- sedimentary record /
- source and burial /
- Tieshangang Bay

HTML全文

图 1 广西铁山港红树林采样点（D1）

Fig. 1 Sampling location (D1) for mangrove forests in Tieshangang Bay, Guangxi

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图 2 沉积物三角分布图

Fig. 2 Triangular distribution of sediment

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图 3 沉积物粒度参数和含水量的垂直分布

Fig. 3 Vertical distribution patterns of sedimentary grain size parameters and water content

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图 4 柱状沉积物²¹⁰Pb、²²⁶Ra、²¹⁰Pb_ex活度垂向分布

Fig. 4 Vertical distribution of ²¹⁰Pb, ²²⁶Ra, excess (²¹⁰Pb_ex) activity in sediment

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图 5 铁山港红树林TOC、TN、C/N、δ¹³C、有机碳通量、不同有机质贡献率的年际变化

Fig. 5 Inter-annual variations of TOC, C/N, δ¹³C, OCAR and contribution rate of different organic matter sources in Tieshangang Bay mangrove forest

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图 6 沉积物沉积通量以及红树林面积等各指标的年际变化

a. 沉积物沉积通量, b. 广西红树林面积^{[30, 40]}, c. 北海市人口（数据来自http://tjj.gxzf.gov.cn）, d. 广西人工岸线^[41], e. 北海市GDP和工农业生产总值（数据来自http://tjj.gxzf.gov.cn）

Fig. 6 The inter-annual variations of MAR and other indicators

a. Mass Accumulation Rate (MAR), b. mangrove area in Guangxi, c. the population of Beihai City (cited from http://tjj.gxzf.gov.cn), d. artificial shoreline, e. GDP and Gross industrial and agricultural products of Beihai City (cited from http://tjj.gxzf.gov.cn)

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表 1 典型红树林湿地沉积物有机碳埋藏通量

Tab. 1 Organic carbon burial fluxes of the typical mangrove wetlands

地点	碳埋藏（平均）/(g·m⁻²·a⁻¹)	参考文献
浙江	105.9 ± 23.9	胡凯杰等^[60]
福建	125.3 ± 56.4	胡凯杰等^[60]
广东	250	覃国铭等^[61]
广西	176.2	褚冠宇^[49]
海南	64	褚冠宇^[49]；孙江^[55]； Jiang等^[62]
广西珍珠湾	84.5	褚冠宇^[49]
广西南流江	309.6	徐慧鹏^[63]
中国	200	王秀君等^[64]
全球	174	Laffoley和Grimsditch^[65]
广西铁山港	87.6	本研究

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