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

Abstract

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

CLC Number:

P597.2

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.

Figures/Tables 8

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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

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

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