成長期の生産性の向上は,温帯の木々の秋の葉の老化を早める
Deborah Zani1, Thomas W Crowther1, Lidong Mo1
1Institute of Integrative Biology, ETH Zurich (Swiss Federal Institute of Technology), Universitätsstrasse 16, 8092 Zurich, Switzerland.
Science (New York, N.Y.)
|November 27, 2020
まとめ
樹木の生産性が高まるのは CO2や温度や光によるもので 秋の葉の老化を早める この発見は 成長期が長くなるという予測を逆転させ グローバルな炭素バランスと 樹木の炭素吸収に 影響を及ぼします
科学分野:
- エコロジー
- 植物生物学
- 気候変動科学
背景:
- 成長期の長さは 生物の相互作用と地球規模の炭素のバランスにとって 極めて重要です
- 秋の葉の老化の環境的要因は十分に理解されていないため,将来の成長シーズンの予測に不確実性が生じています.
研究 の 目的:
- 温帯の木々の秋の葉老化の環境的要因を調査する.
- 将来の成長期の軌道を予測し,炭素バランスへの影響を改善する.
主な方法:
- 制御された実験と 長期観察データを組み合わせたものです
- 二酸化炭素,温度,光のレベルが 植物の生産性や老化に及ぼす影響を分析した.
主要な成果:
- 春と夏の生産性の向上は CO2の上昇,温度,または光により秋の葉の老化を加速することが判明しました.
- この生産性-衰老のリンクを組み込むことで,衰老の予測の精度は27~42%向上しました.
- 将来の予測は,2〜3週間の遅延から,世紀末までに成長期の長さで3〜6日の前進へと変化した.
結論:
- 樹木の季節的な活動停止を規制する上で重要な役割を果たします.
- 将来の生長期と木の炭素吸収は 生産性と老化の関係によって制限されます
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