High-frequency seasonal variation of leaf fluorescence and reflectance in Mediterranean forest species under natural environmental conditions

S. Raddi, F. Magnani
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引用次数: 1

Abstract

The strategies of two evergreen Mediterranean tree species ( Arbutus unedo L. and Quercus ilex L.) to face annual temperature variability and extreme event responses has been monitored in continuum by leaf fluorescence and reflectance. The effect of chilling spells and the accumulation of cold days with chilling and freezing temperatures on winter photo-inhibition was discussed in terms of modulation capacity for fluorescence parameters to daily temperature and irradiance conditions. Throughout the winter Q. ilex resulted less photoinhibited than A. unedo , showing a more dynamic response in all fluorescence parameters and a higher non-photochemical quenching capacity. These characteristics effectively act to maintain a higher electron transport capacity in Q. ilex than in A. unedo .
自然环境条件下地中海森林物种叶片荧光和反射率的高频季节变化
通过叶片荧光和反射率连续监测了两种地中海常绿树种(Arbutus unedo L.和Quercus ilex L.)面对年度温度变化和极端事件响应的策略。从荧光参数对日温度和辐照度条件的调制能力的角度,讨论了寒冷期和寒冷天数随寒冷和冰冻温度的积累对冬季光抑制的影响。整个冬季,Q.ilex比A.unedo产生更少的光抑制,在所有荧光参数中表现出更动态的响应和更高的非光化学猝灭能力。这些特性有效地保持了Q.ilex中比a.unedo中更高的电子传输能力。
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来源期刊
Annals of Silvicultural Research
Annals of Silvicultural Research Agricultural and Biological Sciences-Forestry
CiteScore
2.70
自引率
0.00%
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0
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