CO2の最近の世界的減少 植物の光合成への受精効果
Songhan Wang1,2, Yongguang Zhang3,2,4, Weimin Ju1,2
1International Institute for Earth System Science, Nanjing University, Nanjing, Jiangsu 210023, China.
Science (New York, N.Y.)
|December 11, 2020
まとめ
植物の生産性に対する世界的なCO2肥料効果 (CFE) は減少し,その気候温暖化フィードバックを弱めている. この傾向は1982年から2015年にかけて観察され,気候変動緩和戦略の必要性を強調しています.
科学分野:
- 地球システム科学
- 気候変動に関する研究
- エコロジー
背景:
- 大気中の二酸化炭素 (CO2) の増加は植物の成長 (CO2受精効果,CFE) を促進し,重要な気候フィードバックである.
- CFEの時間的動態とグローバルな傾向はよく理解されていないため,気候モデルの精度に影響を与えています.
研究 の 目的:
- 1982年から2015年にかけてのCO2受精効果 (CFE) のグローバルタイムダイナミクスを調査する.
- 観測されたCFE傾向と現在の炭素サイクルモデルでシミュレートされた傾向を比較する.
主な方法:
- 複数の長期衛星と地上データセットを使用して,グローバルCFEを分析した.
- 観察されたCFEの傾向は,栄養素の利用可能性と土壌水の変化と相関しています.
主要な成果:
- グローバルCFEは1982年から2015年の間にほとんどの陸上地域で減少しました.
- 観察されたCFEの減少は,栄養濃度の変化と土壌の水の利用可能性と相関しています.
- 炭素循環モデルでは,CFEの減少傾向が示されていますが,これは観測されたものより弱くなっています.
結論:
- CFEの減少は 気候温暖化への負のフィードバックの弱まりを意味しています
- この傾向により,将来の気候変動緩和戦略に対する社会の依存が増加する可能性があります.
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