北欧森林における炭素隔離と窒素収支の整合
Reconciling carbon sequestration with nitrogen budgets in Nordic forests (原題)
Filip Moldan, Sara Jütterström, Johanna Stadmark, Anu Akujärvi, Martin Forsius, Kari Austnes, Heleen A. de Wit, Jesper Leth Bak
🤖 gxceed AI 要約
日本語
スウェーデン・ノルウェー・フィンランドの森林を対象に、CLRTAP方式の国家窒素収支とUNFCCC報告の炭素蓄積から化学量論的に導かれる窒素需要を比較した。窒素収支は在庫変化が小さいことを示す一方、報告された炭素蓄積は年間3.1〜8.5kg N/haの窒素を余分に必要とし、大気沈着・窒素固定・施肥の外部供給量に匹敵または超過する。原因は未解明の生態過程か方法論的限界か特定できないが、炭素と窒素の会計枠組みの明示的統合が必要と論じる。
English
Comparing CLRTAP-based national nitrogen budgets with nitrogen demand implied by UNFCCC-reported forest carbon stock changes in Sweden, Norway and Finland, the authors find discrepancies of 3.1–8.5 kg N ha⁻¹ yr⁻¹—comparable to or exceeding total external N supply. The gap may reflect unresolved ecosystem processes, methodological limits, or both. They argue carbon and nitrogen accounting frameworks should be more explicitly integrated to better assess the persistence of forest carbon sinks.
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
森林吸収源は日本の地球温暖化対策計画・NDCやSSBJ/有報の気候関連開示でも重要な位置を占める。炭素と窒素の会計分断という論点は、吸収源の持続性評価やLULUCF報告の精緻化を検討する日本側実務者にとって示唆に富む。
In the global GX context
As ISSB/CSRD and national inventories increasingly rely on forest carbon sinks for net-zero claims, this paper exposes a structural gap between climate (UNFCCC) and air-pollution (CLRTAP) accounting. It adds a caution that sink persistence assessments may rest on unverified nutrient assumptions, relevant to global disclosure scholarship on removals and land-sector accounting.
👥 読者別の含意
🔬研究者:炭素・窒素結合循環と吸収源持続性の会計整合性を検証する研究課題を提示する。
🏢実務担当者:森林吸収源に依存するネットゼロ主張の前提と限界を理解する材料になる。
🏛政策担当者:UNFCCCとCLRTAPの報告枠組み統合の必要性を示す政策的含意がある。
📄 Abstract（原文）
Abstract Forest carbon sinks are central to climate mitigation strategies, their long-term capacity to store carbon is therefore critical. This capacity depends on several factors, notably nutrient availability, particularly nitrogen (N). Although carbon (C) and N cycling are fundamentally coupled in forest ecosystems, climate and air-pollution policies rely on largely separate accounting frameworks. Using forests in Sweden, Norway and Finland as an example, we compared the residuals from national N budgets based on quantified N inputs and outputs following the UNECE Convention on Long-Range Transboundary Air Pollution (CLRTAP) methodology, with the N accumulation implied stoichiometrically from the forest C stock changes reported to the United Nations Framework Convention on Climate Change (UNFCCC). Nitrogen budgets based on inflows and outflows of N indicate only small changes in ecosystem N stocks, whereas reported forest C accumulation implies substantially greater need for N, with discrepancies of 3.1–8.5 kg N ha⁻¹ yr⁻¹, comparable to or exceeding the total annual external N supply from atmospheric deposition, biological N fixation and forest fertilization. The analysis cannot determine whether this discrepancy reflects unresolved ecosystem processes, methodological limitations or both. One possible explanation is redistribution of N from organic matter with lower C/N ratios to pools with higher C/N ratios, implying increasing soil C/N ratios and providing a testable hypothesis. A more complete understanding of the nitrogen flows underpinning forest carbon accumulation would strengthen the scientific basis for assessing the future persistence of forest carbon sinks. More broadly, forest carbon and nitrogen stock changes are closely linked, and accounting frameworks would benefit from more explicit integration of these two elements.
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- openalex https://doi.org/10.1088/1748-9326/aeb70efirst seen 2026-10-23 05:23:08 · last seen 2026-11-06 04:58:29
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