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ŠUMARSKI LIST 11-12/2008 str. 16     <-- 16 -->        PDF

I.Anić, S. Mikac: STRUKTURA, TEKSTURAI POMLAĐIVANJE DINARSKE BUKOVO-JELOVE ...Šumarski list br. 11–12, CXXXII (2008), 505-515
SUMMARY: Not so very long ago (the end of the 19thcentury) a large part
of the Dinaric Mountain range in Croatia was covered by beech-fir and beech
virgin forests. These forests have since been gradually converted into natural
managed forests (Prpić et al. 2001). Nevertheless, several Dinaric beech-fir
virgin forests have remained until the present day, including Čorkova Uvala,
Devčića Tavani, Nadžak-Bilo, Plješivička Uvala, Javorov Kal and Štirovača
(Prpićetal. 2001, Vukelićand Tomljanović2001). Their total area
amounts to 360 ha.

The best investigated of these is Čorkova Uvala. The first scientific forest
research in this forest dates back to 1957. Its structure has since been analyzed
on several occasions: in a permanent sample plot of one hectare
(Tikvićetal. 2006, 2004, Prpićand Seletković 1996, Prpić 1979, 1972),
in 12 sample plots of 2,500 m2each, systematically placed in the form of a
network at a distance of 250 m from each other (Kramarićand Iuculano
1989) and in 153 sample plots, each sized 200 m2and systematically set up in
the central part of the old growth stand in the form of a network 50 m from
one another (Mayeretal. 1980). In addition, several inventories have also
been conducted as part of the management program for the management unit
of Čorkova Uvala (1987), and the structure of a wider area of Čorkova Uvala

– Čudinka reserve has been analyzed (Cestaretal. 1983). Most of these
investigations and inventories provide an average picture of the old growth
stand structure. Apart from the results of Mayeretal. (1980), there have
been no in-depth analyses of its structure and regeneration.
More recently, research into natural regeneration in the old growth stand
of Čorkova Uvala has been intensified and initial results have been published
(Roženbergeretal. 2007). This work presents the results of initial comparative
research into the structure, texture and regeneration in the old
growth stand of Čorkova Uvala.

This research was undertaken in the Dinaric beech-fir virgin forest of
Čorkova Uvala in Plitvice Lakes National Park in the period 2004–2005. The
research involved a systematic sample of 68 plots of 805 m2each. The plots,
set up in the form of a network, were placed 100 m from one another. The
activities in each plot included measuring the terrain slope, describing the
relief, assessing the canopy, identifying life stages of the virgin forest, measuring
breast diameters on all trees (d1.30> 3 cm) and classifying them by tree
species. Dead trees were recorded separately. A height sample was measured
in the plots and in their immediate proximity. The young growth was measured
in each plot over an area of 80 m2and classified by tree species and height.

Research provided the condition of the structure, texture and regeneration
in the old growth stand extending over 80.50 ha. The old growth stand is
made up of 440 trees per hectare on average. Common beech and other hardwoods
(OHW) account for almost half of the trees (49 %). There are 45 % of
fir trees (Abies alba Mill.) and 6 % of common spruces (Picea abies Karst.).
The total tree number declines with an increase in breast diameters. The coefficient
(q) of tree distribution by breast diameter is 1.20. Stand volume is

671.23m2/ha, of which fir accounts for 52 %, broadleaves account for 42 %,
and the remaining 6 % relates to spruce. 7.55 % of the total volume is accumulated
among thinner trees with breast diameters up to 30 cm. Trees with
mean breast diameters between 31 and 50 cm contain 19.92 % of the total
stand volume. The remaining volume of 72.53 % is accumulated on trees with
breast diameters above 50 cm. Different developmental stages have been
identified, albeit over small areas, allowing us to conclude that the stand profile
has the selection form. The initial developmental stage was determined in
9 % of the cases, the optimal stage in 18 % of the cases, the terminal stage in