Foliage phytomass and growth characteristics of English oak (Quercus robur)
1991
Vrestiak, P. (Slovenska Akademia Vied, Mlynany (CSFR). Ustav Dendrobiologie)
An indirect comparative method of leaf frequency and surface with respect to the branch diameter of trees was used to investigate the surface and mass development of foliage phytomass, tree-crown volume and foliage phytomass distribution, and also the growth characteristics of English oak trees growing in the urban and suburban nonforest verdure, in dependence on the diameter, age and height of trees. The results have indicated that English oak trees growing in such environment belong to the tree species with the medium volume of foliage phytomass production. The values of the equivalents of phytomass development are calculated from smoothing polynomials and are given in five-year age intervals, 5 cm diameter categories of stem and 2 m amplitudes of tree heights. At the age of 50 years the leaf surface of English oak makes 419.2 m2 and the tree-crown volume is 947.8 m3. The overlap indexes of leaf surface and crown volume are 3.8 m2. m-2 and 9.0 m3. m-2. The coefficient of tree-crown density is low, its value makes 0.4 m2. m-3. The tree height is 15.1 m and diameter is 48.4 cm. The weight of fresh foliage makes 75.54 kg and of dry foliage 28.87 kg.
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