Organic carbon allocation and stability in mangrove surficial sediment
マングローブ表層堆積物における有機炭素の配分と安定性 (AI 翻訳)
K W Yu, Kai Xiao, Xiaoyi Hu, X Wang, Shuai Gao, H Q Ji
🤖 gxceed AI 要約
日本語
マングローブ堆積物中の有機炭素（SOC）の起源と安定性を調べた。潮汐駆動の地下水涵養帯でSOCが表層に濃集し、深度とともに減少。炭素・窒素安定同位体とベイズ混合モデルにより、マングローブ由来の寄与は涵養帯で71.7%から干潟で4.0%に減少し、海産微細藻類が増加。アミノ酸の同位体分析からマングローブ由来の必須アミノ酸が堆積物中で優占。潮汐帯のゾーニングがSOCの配分と安定性を決定する主要因であることが示された。
English
This study investigates the allocation and stability of organic carbon (SOC) in mangrove sediments. SOC was enriched in surface layers of tidally driven groundwater recharge zones and decreased with depth. Using stable isotopes and a Bayesian mixing model, mangrove contribution decreased from 71.7% in recharge zones to 4.0% at tidal flats, while marine microalgae increased. Amino acid isotope analysis showed mangrove-derived essential amino acids dominate. Tidal zonation is the primary factor controlling SOC allocation and stability.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
マングローブの炭素隔離能は気候変動緩和に寄与するが、日本のマングローブ生態系は限定的であり、直接的な国内政策連動は低い。しかし、藍藻類や干潟生態系の炭素動態研究への応用可能性がある。
In the global GX context
This paper contributes to understanding coastal blue carbon dynamics, relevant to global climate mitigation strategies such as REDD+ and blue carbon accounting. It provides isotopic methods that could inform carbon source tracking in other coastal systems, but does not directly address corporate disclosure frameworks.
👥 読者別の含意
🔬研究者:Provides insights on SOC allocation mechanisms and isotope techniques for blue carbon research.
🏛政策担当者:Supports blue carbon policy development by highlighting tidal zonation's role in carbon storage.
📄 Abstract（原文）
Abstract Mangroves are coastal vegetated ecosystems with a remarkable carbon sequestration capacity that is vital for mitigating global climate change. The sediment organic carbon (SOC) in mangroves originates from both autochthonous plants and allochthonous inputs. However, the primary factor governing the allocation and stability of SOC in mangroves remains under debate. Here, characterization of carbon content and multiple stable isotopes in a marine mangrove revealed that SOC was enriched in surface layers in the tidally driven groundwater recharge zone, and its content decreased progressively with depth. The composition of SOC sources remained consistent within the upper 30 cm but varied considerably across tidal zones. Contributions of three potential sources were quantified using bulk carbon and nitrogen isotope analysis combined with a Bayesian isotope mixing model. The results showed that the contribution of mangrove species diminished from 71.7% ± 9.3% in the recharge zone to 4.0% ± 5.5% at the tidal flat, whereas that of marine microalgae increased from 25.8% ± 11.0% to 89.8% ± 14.3%. Spartina alterniflora was identified as a minor contributor. Compound‐specific carbon isotope analysis of individual amino acids (AAs) showed that mangrove‐derived essential AAs (EAAs) dominate the sedimentary EAA pool. Water extraction experiments, together with the characterization of seawater and porewater, showed that SOC in the recharge zone likely released soluble fractions that underwent mineralization in porewater and exchanged dissolved inorganic carbon with surface waters driven by tidal pumping. Overall, our findings suggest that tidally induced zonation is the overarching factor governing both the allocation and stability of SOC in mangrove ecosystems.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1002/lno.70451first seen 2026-07-08 05:21:50
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