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J. Vukelić, D. Baričević, Z. List, M. Šango: PRILOG FITOCENOLOŠKIM ISTRAŽIVANJIMA ŠUMA ... Šumarski list br. 11–12, CXXX (2006), 479-492
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SUMMARY: Forests of common alder in Croatia cover approximately
8000 ha (Prpić and Milković 2005). The most valuable stands are found in the
management unit Đurđevačke nizinske šume in Podravina. In this area common
alder forms pure or mixed stand extending over about 2000 ha. The
stands manifest distinctly regular growth of good quality. From a phytocoenological
aspect they are characterized by a natural, diverse and rich composition.
The two associations dominated by common alder were studied and
described in detail by M. Glavač in his dissertation of 1960. These associations
include the phytocoenosis of common alder and elongated sedge (Carici
elongatae-Alnetum glutinosae) growing in floodplain sites with stagnant water
and micro-depressions, and a much drier community of common alder and
narrow-leaved ash with birdcherry (Pruno-Fraxinetum) continuing onto the
There have been many changes in the past fifty years elapsing since the research
by Glavač, including the construction of hydropower stations on the
river Drava, drastic ecological transformations and regeneration of the majority
of common alder forests. We have undertaken phytocoenological research
in order to assess the consequences of the changes on the structure, dynamics
and composition of these two associations. The planned field research
was carried out in the vegetation period of 2006 using the standard method of
the Braun-Blanquet school. In doing so, we were able to analyze and compare
the findings, since former research was also conducted using the same method.
Stands with a stable floral composition aged 50 and over were used for
relevés. The relevés were sized 20 × 20 m on average. A total of 28 relevés were
made: 7 in the forest of common alder with elongated sedge and the rest in
the association Pruno-Fraxinetum. Mosses were not considered.
The forest of common alder with elongated sedge (Carici elongatae-Alnetum
glutinosae W. Koch 1926) in Podravina grows on peat and base-rich, humus
gleyic soils saturated with water, which separate this community from the
adjacent ones. The basic factor in the development of this community is the
dynamics of groundwater oscillations. Here, alder is in its optimal stage of
development. Preserved here since the glacial period, it has a relict character.