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首页> 美国卫生研究院文献>Annals of Botany >Physiological Responses of Beech and Sessile Oak in a Natural Mixed Stand During a Dry Summer
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Physiological Responses of Beech and Sessile Oak in a Natural Mixed Stand During a Dry Summer

机译：山毛榉和无梗橡木在夏季自然干燥过程中的生理响应

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Responses of CO2 assimilation and stomatal conductance to decreasing leaf water potential, and to environmental factors, were analysed in a mixed natural stand of sessile oak (Quercus petraea ssp. medwediewii) and beech (Fagus sylvatica L.) in Greece during the exceptionally dry summer of 1998. Seasonal courses of leaf water potential were similar for both species, whereas mean net photosynthesis and stomatal conductance were always higher in sessile oak than in beech. The relationship between net photosynthesis and stomatal conductance was strong for both species. Sessile oak had high rates of photosynthesis even under very low leaf water potentials and high air temperatures, whereas the photosynthetic rate of beech decreased at low water potentials. Diurnal patterns were similar in both species but sessile oak had higher rates of CO2 assimilation than beech. Our results indicate that sessile oak is more tolerant of drought than beech, due, in part, to its maintenance of photosynthesis at low water potential.
机译：在异常干燥的夏季，在希腊的无梗栎（Quercus petraea ssp。medwediewii）和山毛榉（Fagus sylvatica L.）的混合天然林中，分析了CO2同化和气孔导度对叶片水势下降和环境因素的响应。 1998年。两种植物的叶片水势的季节性变化过程相似，而无梗橡木的平均净光合作用和气孔导度始终高于山毛榉。两种物种的净光合作用与气孔导度之间的关系均很强。无梗橡木即使在极低的叶片水势和较高的空气温度下也具有较高的光合作用速率，而在低水势下山毛榉的光合速率下降。两种物种的昼夜模式相似，但无柄橡树的二氧化碳同化率高于山毛榉。我们的结果表明，无梗橡木比山毛榉更耐旱，部分原因是其在低水势下维持光合作用。

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