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S. Orlić. N. Komlenović. P. Rastovski, M. Ocvirck: USPIJEVANJE ŠEST VRSTA ČETINJAČA ... Šumarski list br. 7-8. CXXI (1997). 361 -370
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SUMMARY: An investigation was carried out in the area of the Bjelovar Forest
Administration, at the pilot plots "Slatki potok", in a comparative experiment with six coniferous
species. The pilot plots are located in the hilly area of the Bjelovar Basin. Geographical
positioning was: 45 degrees and 46 minutes ofnothern latitude, 17 degrees and 3 minutes of
eastern longitude and 140- 145 m altitude.
The climate of the investigated area is humid, and the soil is luvic to to sloghl pseudogleic.
With regard to vegetation it is an area of Sessile/lowered Oak and Common Hornbeam forest.
In the comparative experiment the growth of the following coniferous species was investigated:
Norway Spruce (OS), Scotch Pine (OB), Austrian Pine (CB), European Larch, (EA),
Douglas-fir (ZD) and Eastern White Pine (AB).
The planting material utilized was of known origin. The field experiment was established in
the spring of 1969. A randomized block design was applied in three repetitions. Spacing of
planting was 2x2 m (2.500 N/ha) in all species.
The latest measuring during the experiment was taken in the autumn of 1994 and spring
1995, i. e. in the 26th year following its establishment. Plant survival was registered and the
height and diameter breast height of all trees was measured. The volume of wood was calculated
by measured. The volume of wood was calculated by means of one-entry tables-tariffs. The
mean stand tree of each species was calculated by means of the mean basal area and height
curve. The produced biomass in each area unit was calculated by means of the mean stand
tree, which was felled at each repetition. The weight of the fresh matter of the stem, stump,
roots and branches was determined by weighing. Samples for laboratory analyses were taken
from all parts of the tree. The samples were dried at 105 degrees C up to a constant weight, cut
into small pieces, and analysed. A high percentage of survival was registered in Scotch Pine
(81.8%), Austrian Pine (80.1%) and Norway Spruce (79.9%), and considerably poorer in
European Larch (39.1%) and Douglas-fir (17.4%). With regard to the diameter and height
growth the leading species were the Douglas-fir (18.9 cm and 18.71 m), Eastern White Pine
(21.5 cm and 19.15 m) and European Larch (18.9 cm and 18.7 m). The indigenous species of
Scotch Pine, Austrian Pine and Norway Spruce demonstrated slower growth in this developmental
phase. In view of the volume of wood produced per hectare the leading species are the
Eastern White Pine (549.12 m3) and Scotch Pine (336.72 m3), while, due to the low survival
percentage, the European Larch (250.00 m3) and Douglas-fir (169.08 m3) are considerably
Similary as in the case of growing stock, Eastern White Pine produced the largest (242.324
kg/ha), and Douglas-fir the smallest (127.616 kg/ha) amount of dry plant matter. With regard
to the production of biomass the Eastern White Pine is followed by the Scotch Pine (218.081
kg/ha) and then, considerably lagging behind, follow three species; Norway Spruce (175.921
kg/ha), Austrian Pine (168.228 kg/ha) and European Larch (158.231 kg/ha). The share of
bolewood biomass in the overall biomass was relatively the smallest in Norway Spruce
(55.92%), and the greatest in European Larch (71.3 %). The biomass share of the subsoil part
ranged between 10.1% (Austrian Pine) and 16.2% (Eastern White Pine). Regarding nutrients,
wood was the poorest, while needles and bark were the richest. In the majority of the tree
species investigated the biomass contained the most nitrogen, followed by calcium. The spruce
in this experiment, as in several other experiments, absorbed the most calcium. With regard to
the effectiveness of the absorbed nutrients, particularly nitrogen, in view of the bolewood dry
matter produced, it was highest in European Larch, and lowest in Norway Spruce,