Acta Botanica Croatica, Vol. 42 No. 1, 1983.
Izvorni znanstveni članak
Variability of leaf of english oak (Quercus robur L.)
Tomislav Bačić
; Hrvatska
Sažetak
The variability of English oak leaves has been investigated by biometric methods.
The leaves were collected from two different habitats in the area of lower Posavlje: »Batunji« in north-eastern Bosnia and »Zapadne Kusare« in south-eastern Slavonia. The habitat in north-eastern Bosnia was more arid and xerothermic than the habitat in south-eastern Slavonia. In each habitat 250 leaves were collected; 100 from fully grown trees (50 from the top and 50 from the base of the lowest branches), 100 from young trees (50 from the top and 50 from the base of the lowest, branches) and 50 from seedlings. The average height of the fully grown trees was about 10 m, of the young trees about 2 m, and of the seedlings about 20 cm. The leaves were gathered from the height which did not exceed 2 m above the soil surface.
As the leaves were collected from the lowest branches, they had always been more or less in the shade. The variability of the leaf morphology is expressed by a high degree of leaf polymorphism.
An analysis of the leaves from both habitats has shown that the leaves from fully grown trees were significantly longer than the leaves from young trees. Besides, the leaves of fully grown trees had a larger maximal width, a larger width of the leaf base and leaf top than the leaves of young trees. Moreover, the leaves of fully grown trees had a larger number of cuttings and a larger surface than the leaves from young trees. In other parameters the leaves of fully grown trees and young trees were not significantly different; this concerns especially the number of lobes, of cuttings and of lateral nerves. The seedling leaves showed significantly lower values in all parameters.
The leaves from Bosnian and Slavonian habitats were very similar. They differed significantly in only two parameters: the length of the petiole and the width of the leaf base. It seems, therefore, that the more humid Slavonian habitat do not influence considerably the parameters investigated.
The most variable parameters at both habitats were the leaf surface and the length of the petiole. The least variable parameters were the number of lobes, of cuttings and of lateral nerves.
Ključne riječi
Hrčak ID:
158801
URI
Datum izdavanja:
31.12.1983.
Posjeta: 865 *