初期プールが炭素収支計算に及ぼす影響――中国東北部のカラマツ人工林を事例として
Effect of initial pools on carbon balance calculations – a case of larch plantations in northeastern China (原題)
B. Jiang, Xingji Jin, Timo Pukkala, Fengri Li
🤖 gxceed AI 要約
日本語
伐採残渣や枯死有機物、廃棄木製品の分解によるCO2排出を考慮しないと、特に若い人工林の炭素吸収量が過大評価される。本研究はこれらのプールを予測するモデルを開発し、シミュレーションに統合した。その結果、皆伐跡地の若いカラマツ林は約10年間炭素源となり、間伐により3〜7年間炭素源となることが示された。炭素価格の上昇は最適伐期を延長し平均炭素蓄積を増やすが、恒久的な吸収源にはならなかった。
English
Ignoring CO2 from decomposing harvest residues, dead organic matter, and discarded wood products overestimates carbon sequestration, especially in young plantations. This study developed models for these pools and integrated them into simulations, showing that a young larch stand on a clear-felled site acts as a carbon source for about 10 years, and thinning extends this to 3-7 years. Higher carbon prices extend optimal rotation and increase carbon stock, but never make the stand a permanent sink. Reducing thinning and lengthening rotations can improve carbon sequestration in Chinese plantations.
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
日本の森林吸収源対策やJ-クレジット制度において、伐採後の残渣や木材製品のライフサイクルを考慮した炭素収支算定は重要。本研究成果は、初期プールの扱いが吸収量の過大評価を招くことを示し、日本の算定方法や制度設計に示唆を与える。
In the global GX context
This study addresses a critical issue in carbon accounting: the treatment of initial carbon pools and harvested wood products. It provides empirical evidence and modeling approaches that are relevant to global carbon accounting standards (e.g., IPCC guidelines) and climate policy, particularly for forest-based mitigation strategies. The finding that carbon pricing does not create permanent sinks has implications for the design of carbon markets and offset mechanisms.
👥 読者別の含意
🔬研究者:Provides models for initializing DOM and wood product pools, improving carbon balance simulations for plantations.
🏢実務担当者:Offers insights for forest managers and carbon project developers on how to account for initial pools and optimize rotation/thinning for carbon benefits.
🏛政策担当者:Highlights the risk of overestimating forest carbon sinks and the limited effect of carbon pricing on permanence, informing policy design.
📄 Abstract（原文）
Abstract. Carbon dioxide (CO2) released during the decomposition of harvest residues reduces the net carbon sequestration of stands planted on clear-felled sites. All other dead organic materials (DOM) present in the stand, such as litter and dead trees, also decompose and release CO2 into the atmosphere. Carbon is also released when discarded wood products made from previously harvested wood decay. Carbon sequestration is overestimated, especially in young stands, if the CO2 released from DOM and discarded wood products is ignored in calculations. This study developed models to predict the biomass of DOM pools in the stand and the remaining biomass of products made from previously harvested wood. Initializing these biomass pools with the models and simulating DOM decomposition and product disposal helps eliminate overestimates in the carbon sink calculations for young plantations. When these models were integrated into simulation software, it showed that a young larch stand planted on a clear-felled site acts as a carbon source for about 10 years. Thinning treatments convert the stand into a carbon source for 3–7 years. Optimization with carbon subsidies and taxes indicated that higher CO2 prices extend the optimal rotation length and increase the average carbon stock of the rotation. However, carbon pricing never turned the stand into a permanent carbon sink. Carbon sequestration in Chinese plantation forests can be improved by reducing thinning and increasing rotation lengths. The positive effects last as long as it takes to adopt the revised management practices across all forests.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.5194/egusphere-2026-4236first seen 2026-08-19 04:52:41
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