Water relations of crok-oak (Quercus suber L.) under natural conditions |
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Authors: | Oliveira G Correia O A Martins-Loução M A Catarino F M |
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Institution: | (1) Departamento de Biologia Vegetal, Faculdade de Ciências de Lisboa, Campo Grande, C2, 1700 Lisboa, Portugal |
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Abstract: | Daily and annual courses of leaf transpiration, stomatal conductance and shoot water potential of four Quercus suber individuals were compared in a semi-natural stand in southwest Portugal, from spring 1989 to early summer 1990.The trees investigated showed annual patterns typical of evergreen sclerophyllous species but varied in their range of stomatal operation. This appeared to be related to differences in hydraulic conductivity in the root-to-leaf pathway.Maximum stomatal conductance and transpiration rates occurred from March to June.Water stress was found to be moderate and winter cold stress due to low air and soil temperatures appeared to have an influence on plant water balance through their effects on flow resistances.Abbreviations gsw
stomatal conductance
- gmax
maximum stomatal conductance
- PAR
photosynthetically active radiation
- RH
relative humidity of the air
- T
leaf transpiration
- Ta
air temperature
- TL
leaf temperature
- Tmax
maximum leaf transpiration
- W
air-to-leaf vapor pressure difference
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shoot water potential
- PD
predawn shoot water potential
- MIN
minimum shoot water potential |
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Keywords: | Mediterranean climate Montado Quercus suber Soil-to-leaf hydraulic conductivity Stomatal conductance Transpiration |
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