Intercropping with legumes in the Congo Basin increases maize yields but not greenhouse gas emissions
コンゴ盆地でのマメ科作物との間作はトウモロコシ収量を増加させるが、温室効果ガス排出量は増加させない (AI 翻訳)
Steve Kwatcho Kengdo, Liliane Diane Djatsa, Charles Baudouin Njine-Bememba, Javier Tejedor, Klaus Butterbach-Bahl, Mariana C. Rufino, Denis Jean Sonwa, Louis V. Verchot, Michael Dannenmann
🤖 gxceed AI 要約
日本語
コンゴ盆地における農業集約化の影響を初めて実地調査。マメ科作物との間作はトウモロコシ収量を1.4倍に増やし、タンパク質源も提供する一方、N2O排出やCH4吸収に影響を与えなかった。化学肥料の施用は収量を倍増させるが、N2O排出を5倍に増加させた。間作は低GHG排出の集約化オプションとして有望。
English
This first field study in the Congo Basin examines trade-offs between yield and GHG emissions under agricultural intensification. Intercropping with nitrogen-fixing beans increases maize yields by 1.4-fold without affecting N2O emissions or CH4 sinks, whereas moderate fertilizer application doubles yields but increases N2O emissions fivefold. Intercropping offers a low-emission intensification path.
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
本論文はコンゴ盆地の事例だが、日本の農業における炭素貯留やGHG排出削減策としての間作の可能性を示唆する。日本では化学肥料への依存が高いため、窒素固定作物との間作による肥料削減とGHG排出削減の観点から参考になる。
In the global GX context
The study provides rare empirical data on agricultural GHG emissions from the Congo Basin, relevant for global debates on sustainable intensification and climate-smart agriculture. Its findings on intercropping with legumes as a low-N2O option can inform international agricultural policy and development programs.
👥 読者別の含意
🔬研究者:Highlights the need for more field GHG measurements in tropical agriculture and the potential of intercropping as a low-emission practice.
🏢実務担当者:Demonstrates intercropping with legumes as a practical, low-input method to boost yields without increasing GHG emissions, suitable for smallholder farmers.
🏛政策担当者:Shows that intercropping can reconcile food production and climate goals, offering a policy option for sustainable agricultural intensification in developing countries.
📄 Abstract（原文）
Abstract Agricultural intensification on existing arable lands has been proposed to reduce deforestation in the Congo Basin, although the effects of intensification on soil greenhouse gas (GHG) emissions have not yet been investigated. Here, we present the first field study to quantify the trade-offs between yield and GHG emissions across different intensification options in this region. We show that intercropping with nitrogen-fixing beans not only provided additional protein-rich food but also increased maize yields by 1.4-fold while leaving N 2 O emissions and the soil CH 4 sink unchanged compared to unfertilized maize. In contrast, a moderate mineral fertilizer application of 66 kg N ha −1 yr −1 doubled yields, but reduced the soil CH 4 sink strength, and increased N 2 O emissions fivefold to about 4 kg N 2 O-N ha −1 yr − 1 . These N 2 O emissions also exceeded those of natural forests by more than a factor of three, highlighting the GHG cost of mineral fertilizer use in addition to CO 2 emissions from soil organic carbon loss following land conversion. In sum, intercropping with nitrogen-fixing beans had the lowest yield-scaled GHG emissions and can help to address protein malnutrition in regions with limited access to mineral fertilizers or particularly high N 2 O emissions.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.1038/s44264-026-00146-9first seen 2026-05-14 22:41:14
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