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ŠUMARSKI LIST 7-10/1975 str. 73     <-- 73 -->        PDF

sure of this location to snow breakage it is recommended for regular management
to favour the narrow-crowned and slender-branched types, and to eliminate the
wide-crowned and thick-branched stems, which in the natural regeneration should
increase the resistance to snowbreaks of future generations.

The same measures of selection are recommended for the proposed seed crop
stands of Scots Pine. For the purpose of longer-time utilization as seed crop stands
are suggested parts of the younger stands of complete canopy and 70 years of age,
while the earlier suggested older stands (of 140 years age and over) ought to be
eliminated from the list of seed crop stands because of their old age, poor stocking
density and interrupted canopy — and in this connection also of the negative influence
of the inbreeding on the progeny.

Despite the suggested selection measures in the existing stands in respect of
the site and stand conditions (heterogeneity of soil types, poor stocking and
occurrence of larger clearings and unwooded areas) the complex of Bosiljevo offers
large possibilities for the introduction of a wider choice of high-yielding conifers
This possibility is also corroborated by the findings of researchers in this management
unit (Cestar et al. 1964), i. e. that Norway Spruce at the age of 40 years can
achieve a mean annual increment of 15 m3/ha, and Scots Pine 12 m3/ha. For the
introduction of coniferous species are of special interest the results of soil investigations,
which demonstrate that two pedosystematic units (acid brown lessive soil
on relict terra rossa and acid brown soil on relict terra rossa) of high productive
capacity cover almost exclusively the area of the mentioned management unit.

Thanks to favourable site conditions besides the existing coniferous species
such as: Scots Pine, Norway Spruce, European Larch (Sudetic variety) and Black
Pine on the shallower soils, there can be introduced Eastern White Pine (Pinus
strobus L.), Douglas Fir (Pseudotsuga taxifolia /Poir./ Britt.), and this at an adequate
distance from the seed orchards of these two species, as well as trial planting
of new species ond suitable localities.

For this purpose can be taken into consideration: Lodgepole Pine (Pinus
ccwitorta var. latii´olia S. Watson), Grand Fir (Abies grandis /Dough/ Lindl.), Sitka
Spruce (Picea sitchensis /Bong./ Carr.), Western Hemlock (Tsuga heterophylla
/Rat./ Sarg.), Western Redccdar (Thuja plicata D. Don), Japanese Larch (Larix
leptolepis /Sieb, et Zucc./ Gord.)

The complex of Bosiljevo — according to the complexity of its site and stand
conditions — merits special attention and represents a valuable challenge to the
researchers of various specialities for detailed investigations. The results expressed
in this paper only represent a partial solution for the possibilities offered by the
mentioned forest, and give essential information for practice.