長期にわたるバイオカルの使用は,炭素-リンコストビライゼーションを高め,水浸しの米システムにおけるメタン排出量を軽減します
Hao Chen1, Jiahui Xu1,2, Jiahui Yuan1
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China.
Environmental science & technology
|February 13, 2026
まとめ
浸水した米のシステムに長期にわたるバイオカーを使用すると,栄養素の保持が改善され,メタン (CH4) の排出量が大幅に減少します. この気候に配慮した修正案は,土壌の有機炭素 (SOC) とリン (P) の安定性を高め,米栽培に持続可能な解決策を提供します.
科学分野:
- 農業科学 農業科学とは
- 環境科学 環境科学
- 土壌科学は,土壌科学である.
背景:
- バイオカーンは,農業における気候上の利益のために促進されていますが,水浸し米システムにおける栄養素動態と温室効果ガス排出量に対する長期的な影響は十分に理解されていません.
- 浸水した米システムは,メタン (CH4) と栄養素の損失の重要な源であり,生産性と気候の両方に影響を及ぼします.
研究 の 目的:
- 浸水された米のシステムにおける土壌有機炭素 (SOC),リン (P),メタン (CH4) の動態に対するバイオ炭の長期的な影響を調査する.
- 持続的なバイオカルの使用下でこれらの動態を調節する鉱物および微生物のプロセスの役割を理解する.
主な方法:
- 異なる小麦のバイオカル適用率 (0-22.5t ha-1 season-1) を含む13年間のフィールド試験.
- 試験の13年目の土壌の60日間の無酸素化インキュベーション.
- ナノスケール画像とプロファイリングを使用して鉱物成分,SOC,Pダイナミクス,CH4排出量,微生物コミュニティの分析.
主要な成果:
- 長期にわたるバイオカルの使用は,酸化鉄の枯渇とCa相の濃縮につながり,安定したCa-ブリッジされたOC-ミネラル-P複合体を形成しました.
- 高いバイオカーレートは,無酸素下でのFe (III) と硫酸塩の減少を著しく遅らせ,CH4排出量を53-80%削減し,P放出量を60-71%削減しました.
- オーガノミネラル複合体と微生物コミュニティのシフトは,メタノゲネシスを抑制し,栄養素の保持を強化しました.
結論:
- 13年以上にわたるバイオカルの使用は,水浸しの米のシステムにおける土壌の有機炭素とリンの保持を持続的に強化します.
- バイオカーンは,土壌の酸化還元過程と微生物の活動を変えることで,メタン (CH4) の排出量を軽減します.
- バイオチャールは,世界の米生産における栄養素の統合管理と気候変動の緩和のための,スケーラブルで自然に基づいた戦略を提示しています.
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