Managed pasture combines net methane uptake with the lowest soil greenhouse gas balance in a tropical savanna comparison
管理された放牧地は、熱帯サバンナ比較で正味メタン吸収と最低の土壌温室効果ガス収支を組み合わせる (AI 翻訳)
Vicente Batista Souza Junior, Francisco Paulo Amaral Junior, Camila Eduarda Souza de Sousa, Dayanne Dos Santos Neres, Bruno Rafael de Almeida Moreira, Wilson Mozena Leandro, Naiara Caixeta Da Silva, Abmael da Silva Cardoso, Ana Cláudia Ruggieri, Wilton Ladeira da Silva
🤖 gxceed AI 要約
日本語
ブラジルのセラードで、統合的作物-家畜システム（ICLs）、長期管理放牧地（MP）、自然植生（NV）の土壌N2OとCH4フラックスを比較。MPは正味のCH4吸収源であり、CO2換算でN2O排出の18.65%を相殺し、年間のCO2換算収支が最も低かった。ICLsとNVはCH4の発生源だった。連続的な草被覆、土壌通気性、N投入のタイミングが緩和の実践的ターゲットであることを示唆。
English
In the Brazilian Cerrado, soil N2O and CH4 fluxes were compared across integrated crop-livestock (ICLs), long-term managed pasture (MP), and native vegetation (NV). MP was a net CH4 sink, offsetting 18.65% of its N2O emissions in CO2-equivalent terms, and had the lowest annual CO2-equivalent balance. ICLs and NV were CH4 sources. Continuous grass cover, soil aeration, and timing of N inputs are practical mitigation targets.
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
日本では畜産と土地利用のGHG排出削減が課題であり、放牧地管理によるCH4吸収の可能性は、国内の草地管理やバイオ炭利用などの議論に示唆を与える。ただし、ブラジルの熱帯条件に基づくため、日本の気候・土壌への適用には注意が必要。
In the global GX context
This study provides empirical evidence from a tropical savanna that managed pasture can serve as a CH4 sink, contributing to national GHG inventories and climate mitigation strategies. It highlights the importance of land management in achieving climate goals, relevant to global efforts on sustainable agriculture and land use.
👥 読者別の含意
🔬研究者:Provides field-based evidence on soil GHG fluxes in tropical integrated systems, useful for modeling and mitigation research.
🏢実務担当者:Suggests that maintaining continuous grass cover and managing soil aeration can reduce GHG emissions from pasture systems.
🏛政策担当者:Informs land-use policies that promote managed pasture as a climate mitigation option, though system boundaries must be considered.
📄 Abstract（原文）
Abstract Tropical crop-livestock integration is promoted as a route to sustainable intensification, but its direct soil greenhouse gas performance depends on the soil conditions created through management. We compared N 2 O and CH 4 fluxes, water-filled pore space (WFPS), mineral N, and N-cycle functional genes across integrated crop-livestock (ICLs), long-established managed pasture (MP), and native vegetation (NV) sites in the Brazilian Cerrado. Annual N 2 O emissions were 1.41, 0.77, and 1.68 kg N 2 O ha − 1 in ICLs, MP, and NV, respectively. MP was also a net CH 4 sink (-1.40 kg CH 4 ha − 1 ), and this uptake offset 18.65% of its soil N 2 O burden in CO 2 -equivalent terms. ICLs and NV were net CH 4 sources. The contrast did not follow a simple gradient of land-use intensity. Higher WFPS at NV coincided with greater N 2 O and CH 4 emissions, whereas MP combined lower WFPS, greater nifH abundance, and the lowest annual CO 2 -equivalent balance. ICLs shifted toward CH 4 uptake after maize harvest, when grass again occupied the soil. These site-level observations point to continuous grass cover, soil aeration, and the timing of N inputs as practical mitigation targets. They do not establish a whole-system greenhouse gas balance because enteric CH 4 , productivity, and soil carbon change were outside the study boundary.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.21203/rs.3.rs-10563383/v1first seen 2026-08-12 05:51:18
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