DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 1-2/1980 str. 45     <-- 45 -->        PDF

merits at a certain part of the crown were taken of the lengths of branches,
the thicknesses of the bases and middle parts of the branches, the relation between
the thicknesses of the bases and the middle parts of the branches, the branch
thinness coefficient, the number of branches between whorls, branch insertion
and crown orm and construction.


Based on these measurements, the following conclusions were reached:


1. The Japanese larch (L. leptolepsis Gord) and prov. 50 from Sudet, Czechoslovakia
have the longest branches at an altitude of 400-500 meters above sea
level. Larches from the western part of the larch areal in the Alps have shorter
branches.
2. According to the coefficient of branch thinness, the branches having the
most wood are of the Japanese larches and the larches originatinig from the
Carpathians, while larches originating from the Alps show a lower thinness
coefficient.
3. Larches originating from the western Alps, the Dunkeld hybrid (Prov. 29)
and theJapanese larches have the smallest number of branches between whorls.
It was determined that the larches originating from the Carpathians had the
largest number of branches between whorls. This finding is of significance regarding
the cultivation of high quality larch trees, and in selecting the provenance
it should be taken into account.
4. The largest angle of branch insertion was found in the Japanese larch
and the smallest was found in the European larch (L. decidua Mill.) originating
from the Carpathians, The larches originating from the Alps showed medium
angles of branch insertion.
5. The Dunkeld hybrid (Prov. 29) and the Japanese larch had the best
treetop construction and form. Prov. 50 originating from Sudet and Prov. 1 originating
from the Alps were approximately average for the total area. Of the
poorest quality were Prov. 59-2 originating from the Carpathians and Prov. 2
from the Alps.
6. Finally, it can be concluded that in the areas of the Alps and the Carpathians
exist provenances which are excellent in terms of crown construction
and form. It can also be seen that throughout the larch areal there exist provenances
with poorer crown form and construction. These differences are
mostly caused by hereditary characteristics although environmental factors play
a significant role. Therefore, in selecting the most suitable provenances for given
ecologic conditions, in addition to the growth rate at a given altitude, the trunk
quality and the treetop construction and form must be taken into account. Only
on the basis of an all encompassing analysis it is possible to evaluate the suitability
of individual larch provenances.