Abstract
The variation in stomatal activity within the crowns ofAcer campestre, Carpinus betulus andQuercus cerris was measured by vapour exchange porometer on several summer days in an oak-hornbeam forest, in SW Slovakia, Czechoslovakia. Variation resulted from crown position in the forest stand and from leaf position within the canopy. The highest stomatal conductance was in sunlit sun leaves in the upper part of the canopy. Stomatal conductance decreased with increasing depth in the canopy. The steepest decrease was in the upper canopy, in the intermediate zone between fully sunlit and fully shaded leaves, and was caused by the decline in leaf irradiance and in stomatal density. In codominant trees, the conductance in shade leaves at the base of the crown was significantly lower than in the sun leaves at the top of the crown. In a dominant tree,Q. cerris, the differences in stomatal conductance were small and most frequently insignificant. Variation in incident light also determined the diurnal variation of stomatal conductance with respect to crown aspect. Differences between sun leaves on the east and west facing aspects of the overstory crown ofQ. cerris were demonstrated for several days.
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Claims 9
Claim · model-written summary
Stomatal conductance was highest in sunlit sun leaves in the upper part of the canopy.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerris
Carpinus betulus
Quercus cerris
Acer campestree0 - Organ / stage
- sunlit sun leaves in the upper part of the canopye1
- Outcome
- stomatal conductancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“The highest stomatal conductance was in sunlit sun leaves in the upper part of the canopy”
Claim · model-written summary
Stomatal conductance decreased with increasing depth in the canopy.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Organ / stage
- canopye1
- Outcome
- Stomatal conductancee1
- Direction
- decreasede1
- Qualifier
- with increasing depth in the canopye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“Stomatal conductance decreased with increasing depth in the canopy”
Claim · model-written summary
The steepest decrease in stomatal conductance was in the upper canopy, in the intermediate zone between fully sunlit and fully shaded leaves.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Organ / stage
- upper canopy, in the intermediate zone between fully sunlit and fully shaded leavese1
- Outcome
- steepest decreasee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“The steepest decrease was in the upper canopy, in the intermediate zone between fully sunlit and fully shaded leaves”
Claim · model-written summary
The steepest decrease in stomatal conductance is attributed to the decline in leaf irradiance and in stomatal density.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Outcome
- steepest decreasee1
- Qualifier
- caused by the decline in leaf irradiance and in stomatal densitye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“The steepest decrease was in the upper canopy”
e2“was caused by the decline in leaf irradiance and in stomatal density”
Claim · model-written summary
In codominant trees, conductance in shade leaves at the base of the crown was significantly lower than in sun leaves at the top of the crown.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Organ / stage
- shade leaves at the base of the crowne1
- Outcome
- conductancee1
- Direction
- lowere1
- Comparator
- sun leaves at the top of the crowne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“In codominant trees, the conductance in shade leaves at the base of the crown was significantly lower than in the sun leaves at the top of the crown”
Claim · model-written summary
In a dominant tree, Q. cerris, differences in stomatal conductance were small and mostly not significant.
Verbatim
e0“In a dominant tree,Q. cerris, the differences in stomatal conductance were small and most frequently insignificant”
Claim · model-written summary
Variation in incident light determined the diurnal variation of stomatal conductance with respect to crown aspect.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Treatment
- Variation in incident lighte1
- Outcome
- diurnal variation of stomatal conductancee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“Variation in incident light also determined the diurnal variation of stomatal conductance with respect to crown aspect”
Claim · model-written summary
Differences between sun leaves on the east and west facing aspects of the overstory crown of Q. cerris were demonstrated for several days.
Verbatim
e0“Differences between sun leaves on the east and west facing aspects of the overstory crown ofQ. cerris were demonstrated for several days”
Claim · model-written summary
Variation in stomatal activity resulted from crown position in the forest stand and from leaf position within the canopy.
- Taxon
- Acer campestre, Carpinus betulus and Quercus cerrisCarpinus betulusQuercus cerrisAcer campestree0
- Treatment
- crown position in the forest stand and from leaf position within the canopye1
- Outcome
- Variatione1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“crowns ofAcer campestre, Carpinus betulus andQuercus cerris”
e1“Variation resulted from crown position in the forest stand and from leaf position within the canopy”