Leaf diffusion resistance pattern in an oak-hornbeam forest |
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Authors: | P Eliá? |
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Institution: | (1) Institute of Experimental Biology and Ecology, Slovak Academy of Sciences, Dúbravská cesta 26, 885 34 Bratislava, Czechoslovakia |
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Abstract: | Four tree, five shrub, and ten herbaceous species growing naturally in an oak-hornbeam forest were used for simultaneous study
of the leaf diffusive resistances in the course of several summer days. Absolute minima of the stomatal resistance in the
sun tree, the shrub, and the herbaceous species leaves were 1.7 to 6.2 s cm-1, 6.1 to 10.8 s cm-1, and 4.8 to 9.7 (17.3 inConvallaria majalis leaves) s cm-1, respectively. Minimum daily leaf resistances in the course of a day were noted earlier in the morning in sun leaves of large
trees than in shade leaves of other species. Stomata were fully opened later in the morning and they began to close sooner
in the afternoon in usual shade leaves of the plants in the interior of the forest canopy than those in sun leaves in active
surfaces of the canopy (tops of tree crowns). The relatively large differences in leaf resistances found among investigated
species may be explained by differences in leaf anatomy (stomata frequency and size) and in ambient leaf or plant environment
caused by leaf (plant) position in different vertical layers. |
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