DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/1990 str. 22 <-- 22 --> PDF |
Strepački , V. (1931): 0 rentabilitetu odvodnjavanja bara u slavonskim šumama. Šum. list, str. 308—311. Strepački , B. (1931): Odvodnjavanje bara u slavonskim šumama sa biološkog gledišta. Šum. list, str. 408. Tu r ko v i ć, M. (1967): U Vrbanji 1881. Županjski zbornik br. 1, str. 138—141, Županja. Vajda , Z. (1971): Utjecaj melioracija na zdravstveno stanje posavskih šuma. Savjetovanje o Posavini, I, 27—29, I, 1971, str. 363—369, Zagreb. Vujasinović , B. (1971): Historijat hidrotehničkih i melioracionih radova u dolini rijeke Save. Savjetovanje o Posavini I, 27—29, I. 1971. Zagreb. The Succession of Forest Vegetation in the Spačva Basin in the Period from 1970 to 1989 Summary The author deals with the synecological- syndynamic relationship of the forest vegetation of the Spačva basin in 1971 and provides a schematic representation of the predicted successive development of forest vegetation in the Spačva basin (Graph I). To establish a strong connection between the forest vegetation development and the synecological factors of the area investigated, the author laid down approximately 70 km of contour lines in the E—W and N—S direction (see Map 1) and charted the forest vegetation within them in 1971 showing the connection between: relief — soil — water — vegetation. Due to the changes in the synecological factors which have occurred over the past 20 years, and especially the drop in the underground water level and the reclamation of the Spačva basin by various hydroameliorations, a sudden change has occurred in the forest vegetation, i. e. the natural succession of development from wetter to drier forest communities has been speeded up. The progressive succession predicted in Graph 1 has been confirmed, but it has also been speeded up due to the fact that reclamation of the Spačva basin (the drop in the underground water level, the absence of surface flood waters). The change in the forest vegetation is shown in a part of the contour line diagrams (1—4), as well as in the recapitulation of Tables 1—4, from which it is evident that the share of so-called drier plant communities has increased by 21%, as follows: Carpino betuli-Quercetum roboris typicum R a u š 1971 and Genisto elatae- Quercetum roboris aceretosum tatarici R a u š 1971 at the expense of the decrease of wetter plant communities: Genisto elatae-Quercetum roboris caricetosum remotae Horva t 1938 (16.8%), ash forests (0.20%), black alder forests (0.30%) and other areas (3.9%). This natural successive shift in the development of forest communities in the Spačva basin occurs continuously (with no breaks or withering in the constituents of Spačva) and must therefore be accepted as such and used in expert work on constituent renewal. The successive development of the forest vegetation of the Spačva basin is moving towards its climax, i. e. in the direction of the development of the most valuable climatogenous communities of common oak and hornbeam (Carpino betuli-Quercetum roboris typicum R a u š 1971). The author provides data and comments on the underground water level in the Spačva basin in 1970 and 1988. Key words : Forest phytocenosis, synecological factors, underground water, flood, succession, levelling |