Inhibition by Nitrogen Addition of Moss-Mediated CH4 Uptake and CO2 Emission Under a Well-Drained Temperate Forest, Northeastern China
窒素添加による温帯森林の moss 媒介 CH₄ 吸収と CO₂ 放出の抑制: 中国北東部の排水良好な温帯林の事例 (AI 翻訳)
Xingkai Xu, Jin Yue, Weiguo Cheng, Yuhua Kong, Shuirong Tang, D. Khoroshaev, V. Shanin
🤖 gxceed AI 要約
日本語
中国北東部の温帯林で9年間の窒素添加実験を行い、 moss を介したメタン吸収と二酸化炭素放出が窒素添加により抑制されることを発見。この効果は気象条件に依存し、土壌pHや微生物活性が影響する。気候モデルへの反映の必要性を示唆。
English
A five-year field experiment in a temperate forest in northeastern China shows that nitrogen addition (22.5 and 45 kg N ha⁻¹ yr⁻¹) significantly reduces moss-mediated CH4 uptake and CO2 emission, with effects varying by annual weather. Soil pH, available N, and microbial activity (via δ13C) are key drivers. The study highlights the need to incorporate this inhibitory effect in carbon cycle models.
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
日本の森林生態系においても窒素沈着の影響は重要だが、本論文は中国の温帯林に特化しており、日本のGX政策や開示基準（SSBJなど）への直接的な接続は弱い。日本では森林炭素吸収源の評価が重要な研究テーマであり、モデル改良の参考にはなる。
In the global GX context
This paper addresses the mechanistic impact of nitrogen deposition on forest carbon fluxes, which is relevant for global carbon cycle modeling but has limited direct bearing on GX disclosure frameworks (TCFD, ISSB, CSRD). It may inform ecosystem-based carbon offset methodologies but is not aligned with current transition finance or climate accounting standards.
👥 読者別の含意
🔬研究者:For carbon cycle modelers: the study provides empirical evidence of nitrogen-induced suppression of moss-mediated GHG fluxes, which should be integrated into process-based forest C models.
🏛政策担当者:Policymakers working on land-based climate mitigation (e.g., REDD+, NDCs) may consider nitrogen deposition effects when quantifying forest carbon sinks, though the study is ecosystem-specific.
📄 Abstract（原文）
Nitrogen (N) deposition poses a multi-pronged threat to the carbon (C)-regulating services of moss understories. For forest C-cycle modeling under increasing N deposition, failure to mechanistically incorporate the moss-mediated processes risks severely overestimating the C sink potential of global forests. To explore whether and how N input affects the moss-mediated CH4 and carbon dioxide (CO2) fluxes, a five-year field measurement was performed in the N manipulation experimental plots treated with 22.5 and 45 kg N ha−1 yr−1 as ammonium chloride for nine years under a well-drained temperate forest in northeastern China. In the presence of mosses, the average annual CH4 uptake and CO2 emission in all N-treated plots ranged from 0.96 to 1.48 kg C-CH4 ha−1 yr−1 and from 4.04 to 4.41 Mg C-CO2 ha−1 yr−1, respectively, with a minimum in the high-N-treated plots, which were smaller than those in the control (1.29–1.83 kg C-CH4 ha−1 yr−1 and 4.82–6.51 Mg C-CO2 ha−1 yr−1). However, no significant differences in annual cumulative CO2 and CH4 fluxes across all treatments occurred without moss cover. Based on the differences in C fluxes with and without mosses, the average annual moss-mediated CH4 uptake and CO2 emission in the control were 0.77 kg C-CH4 ha−1 yr−1 and 2.40 Mg C-CO2 ha−1 yr−1, respectively, which were larger than those in the two N treatments. The N effects on annual moss-mediated C fluxes varied with annual meteorological conditions. Soil pH, available N and C contents, and microbial activity inferred from δ13C shifts in respired CO2 were identified as the main driving factors controlling the moss-mediated CH4 and CO2 fluxes. The results highlighted that this inhibitory effect of increasing N deposition on moss-mediated C fluxes in the context of climate change should be reasonably taken into account in model studies to accurately predict C fluxes under well-drained forest ecosystems.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.3390/plants15010166first seen 2026-06-29 09:07:51
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