大気の乾燥は,中緯度の森林における昼間の炭素と水の結合を支配する
Yajing Lu1,2, Mengmiao Yang1,2, Jane Liu1,2,3
1Institute of Geography, Fujian Normal University, Fuzhou, China.
まとめ
北半球の森 北半球の森
科学分野:
- エコロジー エコロジー エコロジー
- 環境科学 環境科学
- 気候科学 気候科学
背景:
- 中緯度の森林は,重要な炭素吸収源であり,水循環を調節する.
- 昼間の炭素-水結合を理解することは,地球的なサイクルにとって極めて重要です.
研究 の 目的:
- 北半球の森林における昼間の炭素-水結合の強さを調査する.
- この結合に及ぼす環境要因の影響を分析する.
主な方法:
- 34の森林サイトからの半時間の渦のコヴァリアンス (EC) 流量データを利用した.
- コレレーション分析,リッジ回帰,データバインリングを使用した.
主要な成果:
- 総初次生産性 (GPP) と蒸気伝達量 (ET) は,昼間の異なるパターンを示しています.
- 太陽放射線,気温 (Ta),蒸気圧赤字 (VPD) の増加は,結合を弱め,土壌水分 (SWC) の増加は結合を強める.
- VPDは,ほとんどのサイトで,特に午後,コップリングに影響を与える主要な要因です.
結論:
- 昼間の炭素-水結合の強さはダイナミックであり,環境要因の影響を受けます.
- 非同期的なGPPとET応答は,特に高VPDと温度下では,カップリングを弱める.
- 将来の研究は,多様な生態系における短期的なGPP-ET結合反応を考慮する必要があります.
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