Global Carbon Investment in Terrestrial Biological Nitrogen Fixation
陸域生物学的窒素固定への地球規模の炭素投資 (AI 翻訳)
Duncan N. L. Menge, Carla R. Reis Ely, Steven S. Perakis, Sian Kou‐Giesbrecht, Cory C. Cleveland, Sasha C. Reed, Benton N. Taylor, Sarah A. Batterman, Timothy E. Crews, Katherine A. Dynarski, Jennifer L. Funk, Maga Gei, Kevin L. Griffin, Michael J. Gundale, D. F. Herridge, Sarah Jovan, Mark B. Peoples, Johannes Piipponen, Emilio Rodríguez‐Caballero, Verity Salmon +5
🤖 gxceed AI 要約
日本語
本研究は、全球の生物学的窒素固定（BNF）が正味一次生産（NPP）に占める割合を分析。非農業生態系では高緯度・低生産性バイオームで地衣類や苔類のBNF投資が高い。農業生態系では共生BNF投資が10倍高く、生態系の植物窒素取得の26%を供給。窒素制限や人間活動の影響を解明し、陸域生物圏モデルに示唆を与える。
English
This study quantifies the global carbon investment in biological nitrogen fixation (BNF). They find that in non-agricultural biomes, BNF investment relative to net primary productivity is higher in less-productive, higher-latitude regions, driven by biocrusts and mosses. Agricultural symbioses invest about 10x more in BNF than natural ones, supplying 26% of plant N uptake. The results support strong N limitation at high latitudes and inform terrestrial biosphere 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
日本はSSBJや有報での気候情報開示が進むが、本論文は直接的な開示や脱炭素施策にはつながらない。むしろ、森林や土壌の炭素・窒素循環の基礎理解として、国内の生態系評価や土地利用の議論に参考になる。
In the global GX context
This paper strengthens the empirical basis for nitrogen limitation in high-latitude ecosystems, which matters for global carbon cycle and terrestrial biosphere models used in climate projections. It also underscores how agricultural intensification dominates biological N fixation, relevant to sustainable agriculture and land-use discussions in climate mitigation frameworks.
👥 読者別の含意
🔬研究者:Useful for those modeling carbon-nitrogen interactions in terrestrial biosphere models and interpreting N limitation.
🏛政策担当者:May inform agricultural and land-use policy on nitrogen management, but not directly a GX tool.
📄 Abstract（原文）
Abstract Biological nitrogen (N) fixation (BNF) provides the N needed to produce proteins and other biological building blocks, helping feed humanity and mitigate climate change. Due to its high energetic cost compared to other forms of N acquisition, biotic investment in BNF indicates N limitation. Globally gridded BNF flux data provide an opportunity to determine the energetic investment in BNF across ecosystems, which would help reconcile conflicting indicators of N limitation. Here, we use a new BNF synthesis to quantify the relative importance of BNF in different N‐fixing niches, in different biomes, and across the globe by calculating the fraction of net primary productivity (NPP) invested in BNF and the fraction of plant N acquisition provided by BNF. Larger fractions of non‐agricultural NPP were invested in BNF in less‐productive, higher‐latitude biomes. This pattern was driven by biocrusts and mosses. Similarly, non‐agricultural symbiotic N‐fixing plants invested relatively more of their own NPP in BNF in less‐productive, higher‐latitude biomes. This symbiotic plant pattern was driven by shrubs and herbs, overriding the opposite pattern in trees. Symbiotic plants also acquired a higher fraction of their N from BNF at higher latitudes and in less productive biomes. Investments in symbiotic BNF were 10× higher in agricultural (2.9% of NPP) versus natural (0.29%) biomes, providing 26% versus 3.1% of ecosystem‐scale plant N acquisition. These results support the paradigm of strong N limitation at higher latitudes, help understand the rarity of N‐fixing trees at higher latitudes, underscore the dominance of human activity, and inform terrestrial biosphere models.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1029/2026gb009098first seen 2026-08-01 05:45:41
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