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Stomatal activity within the crowns of tall deciduous trees under forest conditions

  • Original Papers
  • Published:
Biologia Plantarum

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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Authors and Affiliations

  1. Institute of Experimental Biology and Ecology, Slovak Academy of Sciences, Dúbravská cesta 26, 885 34, Bratislava, Czechoslovakia

    P. Eliáš

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  1. P. Eliáš
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Eliáš, P. Stomatal activity within the crowns of tall deciduous trees under forest conditions. Biol Plant 21, 266–274 (1979). https://doi.org/10.1007/BF02902208

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  • DOI: https://doi.org/10.1007/BF02902208

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