Unravelling Saltmarsh Organic Carbon Sources: Biomarker-Isotopic Integration for Credible Blue Carbon Accounting
塩性湿地の有機炭素源の解明：バイオマーカー・同位体統合による信頼性の高いブルーカーボン会計へ向けて (AI 翻訳)
Jinge Zhou
🤖 gxceed AI 要約
日本語
本研究は、中国の二つの塩性湿地において、n-アルカンとアミノ糖のバイオマーカーとδ13C-N/C分析を統合し、堆積有機炭素の起源（植物由来・微生物由来・海洋由来）を定量する手法を開発。植物残渣が有機炭素の75%以上を占め、特に自生植物由来の未変換炭素が36.9-58.2%を占めることを示した。また、土壌特性が炭素源の制御要因であることを解明し、ブルーカーボン会計の信頼性向上に資する方法論的基盤を提供した。
English
This study develops a method integrating n-alkane and amino sugar biomarkers with δ13C-N/C analysis to quantify five organic carbon sources (autochthonous halophytes, allochthonous terrestrial wood, marine algae, fungal necromass, bacterial necromass) in Chinese saltmarshes. Plant residues dominate (>75%), with untransformed autochthonous carbon comprising 36.9-58.2%. Soil texture and nutrients regulate carbon sources. The approach enhances credibility for blue carbon accounting but requires local endmember calibration.
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
日本ではJ-クレジット制度のもとブルーカーボン・クレジットの認証が進められており、本手法は炭素起源の正確な分別を可能とすることで、クレジットの信頼性向上に直結する。日本の干潟や塩性湿地にも応用可能であり、国内のブルーカーボン実務に重要な示唆を与える。
In the global GX context
Globally, blue carbon ecosystems are increasingly incorporated into carbon offset markets (e.g., ICVCM, CORSIA). This paper provides a robust biomarker-isotopic framework for source-resolved organic carbon accounting, addressing a critical credibility gap in blue carbon crediting. The methodology is transferable to other coastal wetlands but requires site-specific endmember calibration.
👥 読者別の含意
🔬研究者:Offers a validated methodological framework for source-resolved blue carbon accounting that can be applied and refined in other coastal ecosystems.
🏢実務担当者:Provides carbon project developers with a scientific basis for quantifying and verifying blue carbon credits from saltmarsh restoration or conservation.
🏛政策担当者:Supports the development of standards and methodologies for blue carbon offset crediting under national and international carbon market frameworks.
📄 Abstract（原文）
Saltmarshes are vital coastal blue carbon (C) ecosystems (BCEs) that store large amounts of organic C (OC) in sediments. This OC originates from both local (autochthonous) and external (allochthonous) marine or terrestrial sources. Accurately quantifying these OC sources is crucial for effectively allocating blue C credits. In this study, we investigated the sources of sedimentary organic carbon (SOC) in two representative Chinese saltmarshes, each characterized by distinct vegetation communities (Spartina alterniflora, Suaeda salsa, and Phragmites australis). By integrating n-alkane signatures (plant sources) and amino sugars (microbial necromass) with δ13C-N/C analysis, we quantify five distinct OC sources: autochthonous plant-derived halophytes OC, allochthonous terrestrial xylophyta OC, and allochthonous marine algae OC, as well as microbial-derived fungal necromass C, and bacterial necromass C. The analysis revealed that plant residues predominate in the SOC, contributing over 75%. Notably, autochthonous untransformed plant-derived OC consistently constituted the highest proportion, ranging from 36.9% to 58.2%. Furthermore, soil texture and nutrient composition were key factors regulating plant- and microbial-derived OC, with distinct pathways mediating these effects. Isotopic validation confirmed biomarker reliability. Our results provide a methodological basis for improving source-resolved blue carbon accounting in saltmarshes, although broader application requires local endmember calibration and consideration of uncertainty.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.6084/m9.figshare.32658078first seen 2026-06-17 05:54:31 · last seen 2026-06-17 09:17:09
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