DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 11-12/2004 str. 38 <-- 38 --> PDF |
I. Trinajstić: NOMENK.LATURNO-SINTAKSONOMSKA ANALIZA ŠUMA OBIČNE BREZE ... Šumarski list br. 11-12. CXXVIII (2004). 627-632 Pevalek , I, 1924: Prilog poznavanju naših breza. đula Roth) u području panonskih šuma bukve i Farmaceutski vjesnik 14: 662-665. jele (Fagetum croaticum boreale abietetosum Rauš,Đ., S. Matić, 1994: Istraživanje vegetacijskih Horv.) na Papuku. Šum. list 114: 357-368. i uzgojnih problema obične breze (Betula pen- Walters, S. M., 1992: Betula L. U T. G. Tut in and đula Roth) na području Požege i Slatine. Glasn. V. H. Heywoo d (eds.): Flora Europaea, 2* Šum. Pokuse 30: 337-360. Ed., 1: 68-69. Cambridge University Press. Rauš, Đ., J. Vukelić, 1986: Vegetacijske i struktur- Weber, H. E., J. Moravec, J. P. Theurillat, ne osobine obične breze (Betula pendula Roth) 2000: International Code of Phytosociological na Psunju. Šum. list 110 (5-6): 177-187. Nomenclature, 3,h Ed. J. Veg. Sci. 11: 739-768. Vukelić, J., Ž. Španjol, 1990: Fitocenološki karakter čistih sastojina obične breze (Betula pen- SUMMARY: The silver birch - Betula pendula Roth is a typical pioneer species which in the progressive succession process on carbonate-free or decalcified carbonate soils is the first to conquer grasslands after mowing and grazing have been abandoned. As the first stage the ass. Pteridio-Betuletum is developed, and afterwards in further succession process the development of the ass. Populo tremulae-Betuletum occurs. During the vegetation mapping in Gorski Gotar, attention was attracted by the birch - Betula pendula stands in the composition of which the species Pteridium aquilinum was distinguished. This group has been designated by Tr i nafst i ć and Sugar as the ass. Pteridio-Betuletum. During mapping, the said stands were not analyzed in detail syntaxonomically, and therefore they remained "nomen solum". It was only by Rauš and Matić (1994) that the ass. Pteridio-Betuletum was presented also by the releves. Similarly Glišić (1950) was the first who published the binomial "Populeto- Betuletum" but without an adequate presentation of its floristic composition by means of any quantitative relations between individual species of the floristic composition, so this binomial remained "nomen nudum ". The floristic composition of silver birch forests is given in Table 1, on the basis of 8 representative releves. Of them, the records 1-3 represent the ass. Pteridio-Betuletum, and the records 4-8 the ass. Populo tremulae-Betuletum. As the characteristic species of the ass. Pteridio-Betuletum it is designated Pteridium aquilinum, which in the floristic composition is present with a high level of covering. As the characteristic species of the ass. Populo tremulae-Betuletum it is designated Populus tremula, which is present in the tree and shrub layer as well as in the herb layer. The characteristic species of the alliance Quercion robori-petreae, the order Quercetalia robori-petreae and the class Quercetea robori-petreae are present relatively well. Distinguished by their absolute domination are Betula pendula and Quercus petraea in the tree layer, and Juniperus communis in the shrub layer. The herb layer is relatively poorly developed, especially within the ass. Pteridio-Betuletum, since due to the dominance of brake ferns just a small number of species has the conditions for survival. The companion species are very numerous. However, only a fairly small number of them achieve a higher level of permanency, the others being present in a few or in one record only. This suggests the idea that the birch stands are very heterogeneous floristically, while the elements of the natural, potentially forest cover indicate the progressive succession toward the development of the acidophilous sessile oak forests, namely acidophilus beech forests. It should be pointed out that a sharp floristic boundary between the said birch forest associations does not exist, and therefore the records 3 and 4 can be considered as a transition between the ass. Pteridio-Betuletum and Populo tremulae- Betuletum, regardless of the areas and floristically analyzed stands involved. |