N2O emission factors across a gradient of pasture intensification in Highlands of Southern Brazil: Refining regional greenhouse gas inventories
南ブラジル高地の牧草地集約化勾配におけるN2O排出係数：地域温室効果ガスインベントリの精緻化 (AI 翻訳)
Pedro A. Garzón-Camacho, Cássio Felipe Lopes, Janquieli Schirmann, Cassiano Eduardo Pinto, Fábio Cervo Garagorry, Cimélio Bayer, Guilhermo Francklin De Souza Congio, André Fischer Sbrissia, Tiago Celso Baldissera
🤖 gxceed AI 要約
日本語
南ブラジル高地の牧草地集約化勾配に沿って、尿素、牛尿、糞由来のN2O排出係数（EF）を測定。IPCC Tier 1デフォルトよりも低いEFが多く、安定した土壌構造の亜熱帯牧草地では排出が低いことを示した。管理強度と窒素源の階層が排出を支配し、地域別EFの採用が国家インベントリ精緻化に有効。
English
This study measured N2O emission factors (EFs) from urea, urine, and dung across a pasture intensification gradient in southern Brazil. Results showed most EFs were lower than IPCC Tier 1 defaults, with stable subtropical pastures emitting less. Management intensity and N source hierarchically control emissions, supporting region-specific EFs for national inventory refinement.
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
ブラジル南部の事例だが、地域別排出係数の設定方法は日本の農業GHGインベントリ改善にも参考になる。特に、土壌撹乱の抑制がN2O排出低減に寄与する知見は、日本の水田や牧草地管理に応用可能。
In the global GX context
This study provides region-specific N2O EFs for subtropical pastures, demonstrating that IPCC defaults may overestimate emissions in stable-soil systems. It underscores the importance of disaggregating EFs by source and management for more accurate national GHG inventories, a key concern for countries like Brazil and other agricultural economies.
👥 読者別の含意
🔬研究者:Methodology for deriving region-specific EFs from field measurements can inform similar studies in other regions.
🏢実務担当者:Corporate sustainability teams in agriculture can use these EFs to refine Scope 1 emissions from fertilizer and livestock.
🏛政策担当者:National inventory compilers should consider adopting disaggregated, region-specific EFs to improve accuracy and identify mitigation levers.
📄 Abstract（原文）
Abstract Accurate greenhouse gas inventories require region-specific emission factors (EFs). Current nitrous oxide (N 2 O) inventories often rely on IPCC Tier 1 defaults, which may not accurately represent subtropical grazing systems where field-based data remain scarce. This study quantified N 2 O EFs from urea fertilizer, cattle urine, and dung across a grazing intensification gradient in the Southern Brazilian Highlands to assess their alignment with IPCC defaults.N 2 O emissions were measured over 100 days using static chambers in four systems: natural grassland (NG), improved natural grassland (ING), perennial pasture (PP), and annual pasture with soil disturbance (AP). Measured EFs suggested a trend toward lower values than IPCC defaults for most sources. Urea in AP was the only treatment exceeding the 1.6% default (EF = 1.7%), while urea-EFs in PP and ING averaged 0.77%. Urine-EFs averaged 0.71% in AP/ING and 0.23% in NG/PP, while dung consistently showed the lowest values (mean = 0.28%). These findings indicate that N 2 O emissions are governed by two interacting hierarchies: management intensity (NG < ING ≈ PP < AP) and nitrogen source (urea > urine ≈ dung). Overall, subtropical pastures with stable soil structures result in lower emissions than global defaults. These results suggest that N 2 O EFs in these systems tend to be lower than current IPCC Tier 1 defaults. Disaggregating EFs by source and management intensity improves national inventories and informs mitigation strategies, such as reducing soil disturbance to preserve the naturally low N 2 O emission potential of subtropical pastures.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.21203/rs.3.rs-9188172/v1first seen 2026-05-14 23:00:23
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