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ŠUMARSKI LIST 1-2/2003 str. 28     <-- 28 -->        PDF

J. Zelic: PROBLEMATIKA GOSPODARENJA PREBORN1M SASTOJINAMA BUKVE I JELE ... Sumarski list br. 1 2. CXXV1I (2003), 11-26
need to be managed so that we can cut only 50 % of increment until we reach
normal volume per hectare.
Cutting should be done in 10 years rotation in diameter classes over 60 cm
(technicllay maturity) and we must remove dead trees too.


We must form group structure in areas of 2/3 to 3/4 height of dominant
trees, comparing, for example, concrete distribution with Beta -distribution
of numbers of trees and volume with normal model.


In stands which volume is over the average we must do cutting more intensively
which is higher then growth, until we reach normal volume. Cutting
must be done in groups in the year when there is good crop of seed and must
be done during 10 years. Groups must be formed in the areas of diameter 1 to
1,5 height of dominant trees.


We should mark and cut silver fir and beech trees which have diameter
over 60 cm and diameter classes (technically maturity) where there are more
trees and volume than in Beta -distribution or normal model, and also we
must do sanitary cutting, as it shown in the graph 3 and table 6.


In stands which have normal volume per hectare we can cut about 50 to
100 % of increment, but we must take care of stability, vitality and ecolocical
condition. In these stands it is desirable that middle diameter class is about
32,5 cm and basal area about 32 m\


Example for definition of permissible cut is mentioned forest compartment
56a, which structure and biometrical parameters shows that that permissible
cut can be almost the same as increment (104,10 mVha by Menagementplan)
in the time before cut.


If we determined permissible cut in compartment 56a by the formula
E = V/3T, where permissible cut is equal volume per hectare divided with a
transiton time multipled with 3. I this way permission cut would be determined
in amount 107 mVha (322/10 3).


In whole permissible cut we must always to add dead and sick trees.
Key words: regular forest association, shelterwood cutting, selection
structure and selection menangement, biometrical parameters, middle breast
diameter, middle volume of trees, Beta distribution, Liocourt´s distribution,
tariffs, transition time, ten -year increment, normal wood volume before
felling and after felling per hectare.