增加生长季节的生产力促使温带树木更早的秋季叶子衰老
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
概括
由于二氧化碳,温度或光线的增加, 导致树叶在秋季更早衰老. 这一发现扭转了长生长季节的预测,影响了全球碳平衡和树木碳吸收.
科学领域:
- 生态学
- 植物生物学
- 气候变化科学
背景情况:
- 生长季节的长度对于生物相互作用和全球碳平衡至关重要.
- 秋季叶子衰老的环境驱动因素尚不清楚,导致未来生长季节的预测不确定.
研究的目的:
- 研究温带树木中秋季叶子衰老的环境驱动因素.
- 改善未来生长季节轨迹的预测及其对碳平衡的影响.
主要方法:
- 结合了受控实验和长期观察数据.
- 分析了二氧化碳,温度和光线水平对植物生产力和衰老的影响.
主要成果:
- 由于二氧化碳,温度或光线的增加, 发现春季和夏季的生产力加快了秋季叶子的衰老.
- 这种生产力与衰老的联系使衰老预测的准确性提高了2742%.
- 未来的预测从预期的23周延迟到本世纪末的36天的增长期.
结论:
- 在规范树木季节性活动停止方面,水槽限制起着至关重要的作用.
- 未来生长季节的长度和树木的碳吸收受到生产力和衰老之间的关系的限制.
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