Low impact of internal stem decay on forest carbon stocks in fire-prone Pinus ponderosa forests
内部幹腐朽が火災にさらされたポンデローサマツ林の森林炭素ストックに与える影響は低い (AI 翻訳)
Markus Hauck, Ganbaatar Batsaikhan, Germar Csapek, Steffen Rust, Harold S. J. Zald, Choimaa Dulamsuren
🤖 gxceed AI 要約
日本語
本研究は、オレゴン州の乾燥した火災頻発地域のポンデローサマツ林で内部幹腐朽の影響を調査。腐朽によるバイオマス損失は約1%と低く、アロメトリック関数を用いた推定が信頼できることを示した。また、最大1%の木が林分バイオマスの50%を占める仮説は成立しないと結論付けた。
English
This study examines the impact of internal stem decay on aboveground biomass in fire-prone Pinus ponderosa forests in Oregon. It finds only ~1% biomass loss, confirming that allometric regressions provide reliable carbon stock estimates even in these forests. The widely cited '1% largest trees hold 50% biomass' hypothesis is rejected for these stands.
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
日本の森林炭素会計においてアロメトリック関数の信頼性評価は重要だが、本研究対象の森林生態系は日本と異なるため直接適用には注意が必要。ただし、炭素蓄積量推定の不確実性評価に示唆を与える。
In the global GX context
This study offers empirical evidence supporting the reliability of allometric biomass functions in fire-prone temperate forests, relevant for forest carbon accounting under IPCC guidelines. It also challenges a common biomass-distribution hypothesis, influencing carbon modeling approaches.
👥 読者別の含意
🔬研究者:Researchers should note the methodological approach for quantifying decay-related biomass loss and the rejection of the 1% tree hypothesis for these forests.
🏢実務担当者:Practitioners can rely on allometric regression for carbon stock estimates in fire-prone temperate forests, with minimal correction for internal decay.
🏛政策担当者:Policymakers may consider this evidence when refining forest carbon accounting guidelines for fire-prone ecosystems.
📄 Abstract（原文）
Large old trees are of eminent importance for organic carbon storage in forest ecosystems and thus play a role in mitigating climate change. Such trees also have an increased risk of internal stem decay and tree cavity formation, which promotes biodiversity, but complicates the prediction of their biomass and carbon stocks, which is usually done from stem diameter and tree height data applying allometric biomass functions. Since the extent of internal stem decay is known to vary widely between different forest ecosystems and data from moist temperate forests exhibited low significance of internal stem decay, we studied dry, frequently fire-exposed Pinus ponderosa forests in central Oregon to capture the other climatic extreme of temperate forests. We hypothesized high significance of internal stem decay for stand aboveground tree biomass, as we assumed widespread stem injury from fire. In addition, we tested the hypothesis that far more than the largest 1% of trees are necessary for 50% stand biomass, as this hypothesis is found in the literature, but has been challenged in other studies. We found low biomass loss due to internal stem decay by only ca. 1% suggesting that also for fire-prone temperate forests of western North America, biomass estimates based on allometric regression are reliable. The '1% largest trees-50% stand aboveground biomass' hypothesis has to be rejection for our forests as long as only trees of a size are included that noteworthily contribute to stand biomass. This metrics strongly depends on regeneration density, which is not relevant for stand biomass.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.64898/2026.05.17.725735first seen 2026-05-22 04:42:18 · last seen 2026-06-16 04:51:32
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