は窒素よりも地球全体の光合成を抑制する
Songhan Wang1, Philippe Ciais2, Peter B Reich3,4,5
1Jiangsu Collaborative Innovation Center for Modern Crop Production, Key Laboratory of Crop Physiology and Ecology in Southern China, College of Agriculture, Nanjing Agricultural University, Nanjing, China. wangsonghan2@gmail.com.
Nature ecology & evolution
|September 2, 2025
まとめ
地球上の植生は,窒素 (N) ではなく,リン (P) によってますます制限されています. この研究は,地球上の炭素吸収源に影響を及ぼし,排出削減戦略の必要性を強調する光合成に対するより強いP制約を明らかにしています.
科学分野:
- エコロジー
- 生地化学
- 植物生理学
背景:
- 窒素 (N) は,伝統的に地球上の植物の成長を制限する主要な栄養素と考えられています.
- 最近の観測により 栄養素制限の動態が変化する可能性があることが示されています
研究 の 目的:
- 過去40年間にわたり,世界の光合成がリン (P) と窒素 (N) によって比較的に制限されていることを調査する.
- 葉の栄養素濃度の低下が植物の光合成と陸上の炭素吸収に与える影響を定量化する.
主な方法:
- 葉の栄養素の8万件以上のフィールド観察 (1980年−2017年) のグローバルデータセットを利用した.
- 機械学習のアプローチを用いて,長期にわたる全葉のNとP濃度データを生成した.
- 葉のPとN濃度の傾向と,その影響が全体的な光合成に及ぼすことを分析した.
主要な成果:
- 葉のP濃度は葉のN濃度 (-0.31%/年) よりも著しく早く減少した.
- Nの制限の1.5倍以上に強くなっています.
- 葉のPとNの減少は,全体的な光合成の増加傾向をそれぞれ約17. 2%と6. 7%減少させた.
結論:
- の制限は 窒素よりも 地球全体の光合成に 強い制約として現れています
- P制限による地上の炭素吸収源の弱化は,より厳格な人類による排出削減戦略を必要とします.
- この研究は 地球の炭素循環と気候の調節における の重要な役割を強調しています
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