Pantropicalの湿潤林における葉の寿命の中央値への収束
Meimei Xue1, Xueqin Yang1,2, Xiuzhi Chen3
1Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon Cycle, School of Atmospheric Sciences, School of Ecology, Sun Yat-sen University, Zhuhai, China.
Nature communications
|January 29, 2026
まとめ
気候変動は、熱帯全域の森林の葉の寿命を変化させている。長寿命の葉は短くなり、短寿命の葉は長くなり、葉の寿命の範囲がより均一になっている。
科学分野:
- 生態学
- 気候変動生物学
- 森林科学
背景:
- 葉の寿命は、熱帯林の生態系機能に影響を与える重要な植物形質である。
- 葉の寿命の時空間的な変動と、気候変動への応答は、依然として十分に理解されていない。
研究 の 目的:
- 2001年から2023年までの熱帯全域の湿潤林における大陸規模の葉の寿命の変動をマッピングすること。
- 気候変動下での葉の寿命の変化の生物群系依存的な傾向とメカニズムを調査すること。
主な方法:
- 地上測定とグリッド化された葉齢依存の葉面積指数データを利用した。
- 23年間の熱帯全域の湿潤林における年平均葉寿命を分析した。
主要な成果:
- アマゾンと熱帯アジアでは葉の寿命が減少し、コンゴと亜熱帯アジアでは増加するという、生物群系に依存した葉の寿命の傾向が観察された。
- 気温の上昇と大気の乾燥が、長寿命の森林における葉の寿命の減少の要因であることが特定された。
- 熱帯全域の森林の葉の寿命が、中央値の範囲に収束することが文書化された。
結論:
- 熱帯全域の森林は、気候変動に対して大規模な構造的および機能的適応を示している。
- 葉の寿命の収束は、気候変動に対する生態系の回復力と抵抗力を高める可能性がある。
- 本研究の結果は、気候駆動型の生態系の安定性へのリスクを予測するのに役立つ。
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