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炭素隔離植林計画における生態系全体の炭素貯留を決定する方法論的枠組み:概念実証調査

A Methodological Framework for Determining Whole-Ecosystem Carbon Storage in Carbon Sequestration Tree Planting Schemes: A Proof of Concept Survey (原題)

Luke Bradley, Lina Khaddour, Islam Shyha, Nagham El-Berishy, Rose Boyko

Preprints.orgプレプリント2026-08-26#炭素会計Origin: Global経営インパクト: 調達リスク対象セクター: agriculture
DOI: 10.20944/preprints202608.1905.v1
原典: https://doi.org/10.20944/preprints202608.1905.v1

🤖 gxceed AI 要約

日本語

本研究は、植林による炭素隔離スキームにおいて、土壌有機炭素(SOC)の変化を考慮した生態系全体の炭素貯留を測定する方法論を提案する。スコットランドの実証試験では、新規植林地の土壌炭素は成熟林より低く、植林直後は生態系炭素が減少することが示され、オフセットスキームのグリーンウォッシュ防止に貢献する。

English

This study proposes a methodological framework to measure whole-ecosystem carbon storage in tree planting schemes, incorporating soil organic carbon changes. A proof-of-concept in Scotland shows that newly planted areas have lower soil carbon than mature woodlands, and initial planting may not yield net carbon gains, helping mitigate greenwashing in offsetting.

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、カーボン・クレジット制度やJ-クレジットにおける植林プロジェクトの有効性評価に示唆を与える。土壌炭素を含む生態系全体の炭素貯留を考慮することで、オフセットの質を高め、企業の排出削減報告の信頼性向上に寄与する。

In the global GX context

Globally, this framework addresses a critical gap in carbon offset accounting by including soil carbon dynamics, relevant for TCFD/ISSB-aligned disclosure and voluntary carbon markets. It provides a tool to assess the real climate impact of tree planting, supporting integrity in transition finance and net-zero claims.

👥 読者別の含意

🔬研究者:Provides a methodological approach for whole-ecosystem carbon measurement, useful for refining carbon accounting models.

🏢実務担当者:Offers a tool to assess the credibility of tree-planting offsets, aiding in avoiding greenwashing in corporate sustainability reports.

🏛政策担当者:Highlights the need for standards that include soil carbon in carbon offset methodologies to ensure environmental integrity.

📄 Abstract(原文)

Corporate carbon offsetting schemes heavily rely on tree planting for carbon sequestration, and in Scotland the government presents tree planting as a key carbon sink in the face of climate change. However, carbon offsetting schemes rarely consider associated fluxes in soil organic carbon (SOC) driven by afforestation. Soils in woodlands store approximately 75% of the total ecosystem carbon, yet planting trees on existing carbon-rich soils or grassland may result in changes in soil carbon that take decades for tree biomass to recover. This study provides a methodological framework using the chronosequence approach (space-for-time substitution) to measure whole-ecosystem carbon storage for existing commercial carbon sequestration schemes. A proof-of-concept pilot study was carried out at the University of Edinburgh’s Rullion Green site, gathering 35 soil samples across unplanted baselines, a recent 2025 planting scheme, and a mature mixed woodland. The findings of this proof-of-concept study show that soil carbon in the newly planted area (5.06% SOC) was lower than in the mature woodland (7.64% SOC) and remained statistically similar to the unplanted baseline (7.11-8.65% SOC depending on slope). The carbon in the recently planted trees (4.10 t C/ha) did not offset the carbon losses from soil, with a drop in ecosystem carbon of 156.41 t C/ha compared to the baseline, and 418.23 t C/ha compared to the mature woodland. The methodology and trial study suggest that initial tree planting may not guarantee an immediate net increase in ecosystem carbon until trees become mature. The methodology therefore provides a tool to help mitigate greenwashing in the offsetting industry. The methodology will now be applied in further research to other sites across northern England to determine what the impact of tree planting for carbon sequestration is on soil in the UK.

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