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尽管Pinus sylvestris在多十年的土壤湿度操纵下进行了口腔调整,但没有树冠温度变化

Alice Gauthey^1,2, Christoph Bachofen^1,2, Janisse Deluigi^1,2

¹Plant Ecology Research Laboratory PERL, School of Architecture, Civil and Environmental Engineering, EPFL, Lausanne, CH-1015, Switzerland.

The New phytologist

|July 24, 2023

概括

土壤干旱影响森林树木生理学,减少光合作用热最佳状态. 虽然树木保持树冠温度低于临界值,但干旱会降低它们在热应激下优化光合作用的能力.

科学领域:

森林生态森林生态
植物生理学植物生理学
气候变化生物学气候变化生物学

背景情况:

全球变暖和干旱压力对森林生态系统构成挑战,影响树木碳吸收和生长.
树木拥有调整热耐受性 (T_crit),光合作用最佳 (T_opt,A_opt) 和树冠温度 (T_can) 的机制,以避免临界过热.
土壤干旱对光合作用和树冠温度调节的热可塑性的影响仍然不太清楚.

研究的目的:

为了研究土壤水分对光合作用和热可塑性的季节性和日间动态的影响, *Pinus sylvestris*.
评估灌在干旱条件下如何影响净光合作用 (A),口腔导电 (g_s) 和热最佳 (T_crit,T_opt,A_opt) 的情况.
为了确定土壤干旱对森林生态系统中树冠温度 (T_can) 调节的影响.

主要方法:

在瑞士一个容易遭受干旱的 *Pinus sylvestris *森林中进行了一年的灌实验.
测量包括净光合作用 (A),口腔导电 (g_s),天花板温度 (T_can) 和热可塑性 (T_crit,T_opt,A_opt) 在灌和干旱条件下.
分析了这些参数的季节性和日间动态,与土壤水分的可用性相关.

主要成果:

与干旱暴露的树相比,灌的Pinus sylvestris树表现出更高的针级净光合作用 (A),口腔导电性 (g_s) 和光合作用最佳性 (T_opt,A_opt).
在灌和干旱压力下的树木之间没有观察到树冠温度 (T_can) 的显著差异,树木始终在临界热值 (T_crit) 下运行.
土壤干旱,主要是通过在温暖干燥的时期减少口腔导电性 (g_s),发现可以降低光合作用最佳温度,尽管天花板和空气温度之间存在强烈的合.

结论:

土壤干旱显著降低了Pinus sylvestris的光合作用热最佳度,通过限制口腔导电性,即使树冠温度低于临界值.
森林树可以保持树冠温度低于破坏性水平,但在干旱条件下表现出减少的光合作用热可塑性.
这些发现突出了森林对干旱的复杂生理反应,并对预测气候变化下的森林弹性产生影响.

关键词:

松树 (Pinus sylvestris) L. L. 松树 (Pinus sylvestris) 是一种葡萄树,它生长在山上.干旱干旱干旱干旱灌灌方式光合作用光合作用.塑性的可塑性塑性温度响应温度响应的时间温度调节温度调节

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