门口关闭后的水损失:在严重干旱期间,在九种温带欧洲树种中量化叶子的最小导电量和最小用水量
Songwei Wang1, Günter Hoch1, Georges Grun1
1Department of Environmental Sciences - Botany, University of Basel, Schönbeinstrasse 6, 4056 Basel, Switzerland.
Tree physiology
|February 27, 2024
概括
剩余的树冠透气 (Emin_canop) 对于干旱期间树木的生存至关重要. 叶子的最小导电量 (gmin) 根据物种和温度而异,影响Emin_canop和干旱脆弱性.
科学领域:
- 植物生理学 植物生理学
- 森林生态 森林生态
- 干旱压力生理学 干旱压力生理学
背景情况:
- 在干旱期间,残留的树冠透气 (Emin_canop) 对于树木生存至关重要.
- Emin_canop主要受到叶子最小导电量 (gmin) 和蒸汽压力缺陷的影响.
研究的目的:
- 为了研究九种欧洲树木物种的季节性变异.
- 为了将叶子的皮质和口腔特征与物种间的变化相关联,gmin.
- 为了确定物种特异性热量反应的gmin及其对Emin_canop.的影响.
主要方法:
- 在九种欧洲树种中测量了木的季节性变化.
- 分析了木头和叶子特征 (结状和口腔) 之间的关系.
- 评估了gmin (25-50°C) 的特定物种温度反应.
- 在2022年欧洲热干旱事件期间计算Emin_canop.
主要成果:
- 环境gmin从0.8到4.8 mmol m-2 s-1不等,对于大多数物种而言,季节性稳定.
- 的物种间变异与叶子的皮质和口腔特征有关.
- 在温度从25°C上升到50°C时,平均气温翻了一番或翻了四倍.
- 标准化的Emin_canop范围从2.0到36.7 L m-2,在更高的温度下更高的值.
结论:
- 特定物种的木和Emin_canop对于树木的水分和干旱生存至关重要.
- 即使闭着口腔,树木也需要水,这凸显了Emin_canop.的重要性.
- 在gmin和Emin_canop的差异有助于特定物种的干旱脆弱性.
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