DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 1-2/1966 str. 136 <-- 136 --> PDF |
species (Salix alba L. and Salix fragilis L.) as well as intermediate types resembling the mother and father respectively. Basic mensurational data concerning the mentioned hybrids from the region of the Drava River and the park forest »Maksimir« are given in Table 1. Mean No. Age; Height D. b. h. Volume annual of Sex years m. cm. cu. m. increment Locality Remarks tree cu. m. 15 39 28,0 47,0 1,961 0,0502 Crni Jarci (Đurđevac) Determinated as: S. alba L. x S. frag. L. 22 M 11 22,0 32,0 0,743 0,0675 Limbuš (Đurđevac) S. frag. L. S. alba L. x 23 F 30 28,0 64,0 3,716 0,1242 Maksimir (Zagreb) S. alba L. x S frag. L. 24 M 30 22,0 48,0 1,701 0,0568 Maksimir (Zagreb) S. frag. L. S. alba L. x From the tree No. 24 was not raised a generative progeny but on the basis of taxonomic characteristics we assume that it is also an interspecific hybrid. As can be seen from the enclosed table the interspecific hybrids between White and Crack Willow and between Crack and White Willow distinguish themselves by their vitality. E. Weber (4) states that between the above- mentioned species could be found individuals of excellent qualities with regard to the essential characteristics of habit, and in addition, with high growth rates. On the basis of observations made on the mentioned hybrids and on the ground of results of the controlled hybridisation between these two species it must be assumed that the reciprocal hybrids are not equal but resemble to the one or other species in dependence on which species functions as the female parent. We assume that in these cases we have the effects of matroclinal inheritance. The species Salix alba L. and Salix fragilis L. are easy to cross with one another. Fertile are also the interspecific hybrids of these two species. In order to verify our hypothesis that the interspecific hybrids between White and Crack Willow are of greater vitality than pure parent species we raised during 1964/65 the interspecific hybrids Salix fragilis L. x Salix alba L. We also wanted to find out whether the populations along the Drava River are actually of greater vitality than these along the Sava River, or whether the differences in vitality are conditioned by more favourable environmental conditions along the Drava River. Therefore we raised in 1964 a generative progeny from one population occuring along the Drava River (Bakovci— Đurđevac), and from one population inhabiting the area along the Sava River (Osman Polje — Lipovljani). In the population »Bakovci« the seed was collected from 4 trees, and in the population »Osman Polje« from 6 trees. |