Responses of Soil Carbon Release to Freeze–Thaw Cycles Mediated by Carbon Availability at Regional and Global Scales
凍結融解サイクルに対する土壌炭素放出の応答：地域および全球スケールでの炭素利用可能性による調節 (AI 翻訳)
S K Wang, Shuqi Qin, Yan Yang, Yan Yang, Leiyi Chen, Luyao Kang, Yuanhe Yang, Yuanhe Yang
🤖 gxceed AI 要約
日本語
チベット永久凍土帯の1000kmトランセクトに沿った表土サンプルを用いた凍結融解実験により、凍結融解サイクルが二酸化炭素放出を平均20%増加させることを発見。この増加は主に土壌炭素利用可能性に依存し、微生物群集組成の変化の影響は小さかった。全球スケールでも同様のパターンが確認され、永久凍土炭素‐気候フィードバックのモデル化には基質利用可能性を考慮する必要がある。
English
Using topsoil samples along a 1000-km transect across the Tibetan permafrost region, freeze-thaw microcosm experiments showed that freeze-thaw cycles significantly increased soil CO2 release by 20% on average. This response was primarily driven by soil carbon availability (e.g., soil organic carbon content and dissolved organic carbon) rather than microbial properties. Global-scale analysis confirmed the effect, highlighting the need for models to incorporate substrate availability to predict permafrost carbon-climate feedback.
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
日本には永久凍土は少ないが、地球規模の気候変動フィードバックとして、炭素循環モデルの改善に重要な知見を提供する。シベリアやカナダなど他地域の永久凍土研究とも比較可能。
In the global GX context
This study provides empirical evidence from a critical permafrost region (Tibetan Plateau) that freeze-thaw cycles amplify soil CO2 release, emphasizing carbon availability over microbial community. The findings are relevant for global carbon-climate feedback models and can inform IPCC assessments and national climate strategies for permafrost regions.
👥 読者別の含意
🔬研究者:Provides mechanistic understanding that FTC-induced CO2 release is controlled by carbon availability, not microbial shifts, improving permafrost carbon models.
🏛政策担当者:Highlights the importance of permafrost carbon feedback in climate projections, which should be considered in long-term climate targets and adaptation planning.
📄 Abstract（原文）
ABSTRACT Soil freeze–thaw cycles (FTCs) are widespread across mid‐ to high‐latitude and high‐altitude regions, with particularly high frequency in permafrost areas where they can enhance soil carbon release and potentially accelerate climate warming. However, the response of soil carbon release to FTCs and its determinants at the regional scale remain unclear due to the lack of direct experimental evidence. Here, based on topsoil samples along a 1000‐km transect across the Tibetan permafrost region, we conducted a freeze–thaw microcosm experiment (5 cycles of 1‐day freezing and 3‐day thawing) to investigate patterns and predictors of FTC‐induced soil carbon dioxide (CO 2 ) release. The results revealed that FTCs significantly increased soil CO 2 release by 20% ± 2% relative to the thaw‐only control across all cycles. This response was primarily driven by soil carbon availability rather than microbial properties. Soils with higher carbon availability, as indicated by initially (prior to FTCs) larger soil organic carbon content and less mineral‐protected carbon, as well as greater post‐thaw increases in dissolved organic carbon, released more CO 2 under FTCs. Such an effect of carbon availability was further confirmed at the global scale. Although FTCs altered the microbial community composition, notably leading to an increase in the proportion of r ‐strategists, microbial properties played a minor role in influencing the CO 2 release. These results demonstrate the crucial role of soil carbon availability in affecting responses of CO 2 release to FTCs, highlighting the need for models to explicitly characterize pulsed CO 2 release associated with substrate availability to better predict permafrost carbon‐climate feedback.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1111/gcb.70991first seen 2026-07-09 05:22:54
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