稳定同位素示踪浙江清江口红树林沉积物氮源及其影响因子分析

doi:10.11978/2025124

热带海洋学报 ›› 2026, Vol. 45 ›› Issue (3): 202-211.doi: 10.11978/2025124CSTR: 32234.14.2025124

稳定同位素示踪浙江清江口红树林沉积物氮源及其影响因子分析

谭清碧¹(), 郭泓瀛¹, 孙思旗¹, 钟宇航¹, 聂会², 牛丽霞¹^,³^,⁴()

¹ 中山大学, 海洋工程与技术学院/南方海洋科学与工程广东省实验室, 广东珠海 519000
² 浙江水利水电学院水利工程学院, 浙江杭州 310018
³ 河口海岸研究所/广东省海岸与岛礁工程技术研究中心, 广东珠海 519000
⁴ 广东省深水信息技术重点实验室, 广东珠海 519000

收稿日期:2025-08-06 修回日期:2025-10-06 出版日期:2026-05-10 发布日期:2026-05-28
通讯作者: 牛丽霞(1985—), 女, 副教授。email: niulixia@mail.sysu.edu.cn
作者简介:
谭清碧(2002—), 女。email: tanqb@mail2.sysu.edu.cn
基金资助:
浙江省自然科学基金项目(LGEY25E090012); 浙江省水利厅科技计划项目(RC2436); 国家自然科学基金(51709289)

Analysis of nitrogen sources and influencing factors in mangrove sediments of the Qingjiang River estuary (Zhejiang) using stable isotopes

TAN Qingbi¹(), GUO Hongying¹, SUN Siqi¹, ZHONG Yuhang¹, NIE Hui², NIU Lixia¹^,³^,⁴()

¹ School of Ocean Engineering and Technology, Sun Yat-sen University (Guangzhou)/Southern Laboratory of Ocean Science and Engineering, Zhuhai 519000, China
² Water Conservancy and Hydropower College, Zhejiang University of Water Resources and Electric Power School of Hydraulic Engineering, Hangzhou 310018, China
³ Institute of Estuarine and Coastal Research, Guangdong Provincial Engineering Research Center of Coasts, Islands and Reefs, Zhuhai 519000, China
⁴ Guangdong Provincial Key Laboratory of Information Technology for Deep Water Acoustics, Zhuhai 519000, China

Received:2025-08-06 Revised:2025-10-06 Online:2026-05-10 Published:2026-05-28
Contact: NIU Lixia. email: niulixia@mail.sysu.edu.cn
Supported by:
Zhejiang Provincial Natural Science Foundation Project(LGEY25E090012); Science and Technology Program of Zhejiang Provincial Department of Water Resources(RC2436); National Natural Science Foundation of China(51709289)

摘要/Abstract

摘要：

浙江乐清湾清江河口位于我国红树林分布的最北端, 处于温带与亚热带交会的生态过渡地带, 开展红树林区域沉积物氮源研究, 具有重要的生态参考价值。本文选取清江口红树林(2019—2020年种植)、互花米草、混合区等典型植被区域为研究对象, 通过分析沉积物中总氮(total nitrogen, TN)、总有机氮(total organic nitrogen, TON)、总有机碳(total organic carbon, TOC)及总有机质(total organic matter, TOM)等指标, 并结合δ¹³C、δ¹⁵N稳定同位素特征及多源混合模型(mixing stable isotope analysis in R, MixSIAR), 识别氮和有机质的主要来源。结果表明, 清江河口沉积物氮、碳含量整体呈现由西向东递减趋势, 反映出陆源输入强度的空间梯度差异; 不同植被类型区域的氮形态及含量差异显著, 互花米草区由于植物根系活性较弱、生产力较低、有机质分解速率较快, 对外源有机质与氮素的截留能力有限, 红树林生态系统在调节氮循环方面的功能强于互花米草。氮源分析显示, 该区域主要以其他陆源输入为主, 占33.65%, 红树林(C₃植物)贡献率达到25.28%, 海洋来源贡献为23.78%, 互花米草(C₄植物)的影响相对较小, 为17.33%。本研究揭示了清江河口植被类型与氮的空间分布之间的关系, 探讨了红树林在区域氮循环过程中的关键生态功能, 为不同气候带红树林生态系统的保护修复与河口氮污染防控提供了理论依据和实践指导。

关键词: 清江河口, 沉积物, 稳定同位素, 红树林, 有机质

Abstract:

The Qingjiang River estuary in Yueqing Bay (Zhejiang Province) is located at the northernmost limit of mangrove distribution in China, situated in an ecological transition zone between temperate and subtropical regions, and holds significant ecological reference value. Field sampling and analyses were conducted in typical vegetation zones including mangroves (planted in 2019 and 2020), Spartina alterniflora stands, and mixed vegetation areas. Key parameters, including total nitrogen (TN), total organic nitrogen (TON), total organic carbon (TOC), and total organic matter (TOM) in sediments, were analyzed. Combined with δ¹³C and δ¹⁵N stable isotope characteristics and a multi-source model (MixSIAR), the major sources of nitrogen and organic matter were identified. The results showed that nitrogen and carbon contents in estuarine sediments exhibited an overall decreasing trend from west to east, reflecting spatial gradient differences in terrestrial input intensity. Nitrogen forms and concentrations varied significantly among different vegetation types. In S. alterniflora areas, weaker plant root activity, lower productivity, and faster organic matter decomposition rates resulted in limited retention capacity for exogenous organic matter and nitrogen. The mangrove ecosystem demonstrated stronger regulatory functions in nitrogen cycling compared to S. alterniflora. Nitrogen source analysis revealed that other terrestrial inputs were predominant, accounting for 33.65%, followed by mangroves (C₃ plants) contributing 25.28%, marine sources contributing 23.78%, and S. alterniflora (C₄plants) having relatively minor influence at 17.33%. This study elucidates the relationship between vegetation types and spatial nitrogen distribution in the Qingjiang River estuary, and explores the key ecological functions of mangroves in regional nitrogen cycling processes. The findings provide a theoretical basis and practical guidance for the protection and restoration of mangrove ecosystems across different climate zones and for nitrogen pollution control in estuarine environments.

Key words: Qingjiang River estuary, sediment, stable isotopes, mangrove, total organic matter

中图分类号:

P597.2

谭清碧, 郭泓瀛, 孙思旗, 钟宇航, 聂会, 牛丽霞. 稳定同位素示踪浙江清江口红树林沉积物氮源及其影响因子分析[J]. 热带海洋学报, 2026, 45(3): 202-211.

TAN Qingbi, GUO Hongying, SUN Siqi, ZHONG Yuhang, NIE Hui, NIU Lixia. Analysis of nitrogen sources and influencing factors in mangrove sediments of the Qingjiang River estuary (Zhejiang) using stable isotopes[J]. Journal of Tropical Oceanography, 2026, 45(3): 202-211.

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点位	C/N值
点位	互花米草区	混合区	红树林区(2020)	红树林区(2019)
1	11.02	50.57	66.08	10.41
2	14.09	48.16	8.72	11.90
3	10.47	-	7.82	-
4	15.13	38.81	8.50	11.44
5	11.89	49.26	9.42	16.84
6	12.89	41.68	8.21	22.65
7	18.01	48.35	10.41	13.05
8	24.83	45.57	51.37	12.24
平均值	14.79	40.44	21.32	23.18

有机质来源	δ¹³C /‰	δ¹⁵N /‰	C/N	数据来源
红树林(C₃植物)	-32~-24	3.11~3.93	>20	吴雪等, 2025; Ye et al, 2024
互花米草(C₄植物)	-17~-9	2.52~4.85	15~25	吴雪等, 2025; Ye et al, 2024
海洋输入	-23.40~-20.60	4~9	6~8	权伟等, 2018; Xie et al, 2024
其他陆源输入	-27~-25	3~8	30~50	Li et al, 2022;Wu et al, 2023;章叶飞等, 2025

有机质来源	δ¹³C/‰	δ¹⁵N/‰	贡献率范围/%
红树林(C₃植物)	-28.00	4.50	23.50~27.80
互花米草(C₄植物)	-13.00	3.46	17.10~18.20
海洋来源	-22.00	6.00	22.20~25.20
其他陆源输入	-26.00	3.00	31.80~35.70

稳定同位素示踪浙江清江口红树林沉积物氮源及其影响因子分析

Analysis of nitrogen sources and influencing factors in mangrove sediments of the Qingjiang River estuary (Zhejiang) using stable isotopes

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