微生物の効率は,有機肥料化による深度に依存する土壌の炭素貯蔵を促進します
Wentao Zhang1, Yingxin Lu1, Leanne Peixoto2
1College of Agriculture, Nanjing Agricultural University, Nanjing, Jiangsu, China.
Journal of environmental management
|February 20, 2026
まとめ
有機肥料は,微生物の炭素利用効率 (CUE) と死体形成を高めることによって,土壌の有機炭素 (SOC) の貯蔵を促進します. この効果は,より深い土壌層ではより顕著であり,それらを重要なSOCシンクに変えます.
科学分野:
- 土壌科学は,土壌科学である.
- 微生物学 微生物学とは
- バイオジオケミストリー バイオジオケミストリー
背景:
- 微生物の活動と循環は,土壌有機炭素 (SOC) の蓄積の主要な原動力である.
- 微生物の生死サイクルによって媒介される,土壌の深いところのSOC貯蔵に対する受精の影響は,メカニズム的な理解が欠けている.
研究 の 目的:
- 長期肥料,特に有機肥料が,微生物の炭素利用効率 (CUE) と土壌の異なる深さでの土壌有機炭素 (SOC) の蓄積にどのように影響するか調査する.
- 微生物の死体質が様々な受精方式でSOCの貯蔵に貢献するメカニズムを解明する.
主な方法:
- 45年間の長期受精実験 (コントロール,NPK,糞便,NPK+糞便) の土壌サンプルを分析した.
- H218Oラベルを使用した微生物の炭素利用効率 (CUE) の測定.
- アミノ糖分析を用いた微生物の死骸質の定量化.
- 酸化鉄とCa2+含有量を含む土壌特性の評価.
主要な成果:
- 有機肥料 (MとNPKM) は,栄養バランスと土壌構造を改善することによって,表面土壌における微生物の成長とCUEを大幅に増加させた.
- 肥料の適用は,鉱物肥料化 (NPK) と比較して,地表土における微生物の死骸質のより高い収量をもたらした.
- 微生物のバイオマス,死体質,CUEは土壌の深さに伴い減少したが,堆肥に富んだ元素は死体質を安定させ,地表土 (34-43%) と対比して深層土壌 (74-76%) のSOCへの貢献を増加させた.
結論:
- 微生物CUEの改善,特に有機肥料による改善は,持続性のある微生物由来有機物質の形成を促進することによって,SOCの結合を強化します.
- 有機肥料の適用は,微生物の死体質を安定させることで,地下を支配的なSOC沈殿所に変えます.
- 肥料化戦略は,SOCの効果的な管理のために,微生物のプロセスと土壌の深さを考慮する必要があります.
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