A global assessment of mangrove soil organic carbon sources and implications for blue carbon credit

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Communications Pub Date : 2024-10-18 DOI:10.1038/s41467-024-53413-z

Jingfan Zhang, Shuchai Gan, Pingjian Yang, Jinge Zhou, Xingyun Huang, Han Chen, Hua He, Neil Saintilan, Christian J. Sanders, Faming Wang

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Abstract

Mangroves can retain both autochthonous and allochthonous marine and/or terrestrial organic carbon (OC) in sediments. Accurate quantification of these OC sources is essential for the proper allocation of blue C credits. Here, we conduct a global-scale analysis of sediments autochthonous and allochthonous OC contributions in estuarine and marine mangroves using stable isotopes. Globally, mangrove-derived autochthonous OC was the main contributor to estuarine and marine mangrove top-meter soil organic carbon (SOC) (49% and 62%, respectively). Less marine allochthonous OC (21%) was deposited than terrestrial allochthonous OC (30%) in estuarine mangrove sediments. Estuarine mangroves accumulated more SOC in sediments than marine mangroves (282 ± 8.1 Mg C ha⁻¹ and 250 ± 5.0 Mg C ha⁻¹, respectively), primarily due to the additional terrestrial OC inputs. Globally, marine mangroves held 67% of the total mangrove SOC, reaching 3025 ± 345 Tg C, while 1502 ± 154 Tg C was stored in estuarine mangrove sediments. The findings emphasize the substantial influence of coastal environmental settings on OC contributions, underlining the necessity of accurate OC source quantification for the effective allocation of blue carbon credits.

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红树林土壤有机碳源全球评估及其对蓝碳信用的影响

红树林可在沉积物中保留自生和异生的海洋和/或陆地有机碳 (OC)。准确量化这些有机碳来源对于合理分配蓝碳信用额度至关重要。在此，我们利用稳定同位素对河口和海洋红树林沉积物中的自生和异生有机碳贡献进行了全球范围的分析。在全球范围内，红树林自生有机碳是河口和海洋红树林表层土壤有机碳（SOC）的主要来源（分别占 49% 和 62%）。沉积在河口红树林沉积物中的海洋异源有机碳（21%）少于陆地异源有机碳（30%）。河口红树林比海洋红树林在沉积物中积累了更多的 SOC（分别为 282 ± 8.1 Mg C ha-1 和 250 ± 5.0 Mg C ha-1），这主要是由于陆地 OC 的额外输入。在全球范围内，海洋红树林储存了红树林 SOC 总量的 67%，达到 3025 ± 345 兆吨碳，而河口红树林沉积物则储存了 1502 ± 154 兆吨碳。研究结果强调了沿海环境对 OC 贡献的重大影响，强调了准确量化 OC 来源对有效分配蓝碳信用额度的必要性。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.