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ŠUMARSKI LIST 13/2011 str. 203     <-- 203 -->        PDF

S. Perić, M. Tijardović, A. Jazbec: REZULTATI ISTRAŽIVANJAPROVENIJENCIJAZELENE DUGLAZIJE U ... Šumarski list – Posebni broj (2011), 190-201

Provenance with the highest average value of all analyzed parameters on
locality Durgutovica is Hvidilde from Denmark (39,4 cm DBH, 27,7 m height,
1,68 m3 volume). In the case of volume, there is no statistically significant differences
of this provenance and all other provenances except Šipka (1,45 m3)
from Bulgaria and Tenino (1,41 m3) from Washington. Based on this result,
those three provenances can be highlighted as the best provenances regarding
volume on locality Durgutovica. According to statistical analysis of all analyzed
parameters (DBH, height, volume) the poorest success on locality Durgutovica
showed provenances Salmon Arm from British Columbia (26,1 cm
DBH, 20,7 m height, 0,64 m3 volume) and Skrad from Croatia (29,7 cm DBH,
22,0 height, 0,80 m3 volume).

Provenance Elma from Washington, and generally speaking all provenances
from Washington and European provenances from Denmark and Bulgaria
showed the best success on Slatki Potok locality. On this locality the lowest
average value of volume shows provenance Shady Cove (0,32 m3) from Oregon,
which statistically differs from all provenances except provenance Salmon
Arm (0,33 m3) from British Columbia. Those two provenances are
excluded as the worst on this locality according to all analyzed parameters.
The lowest DBH values belong to provenances from British Columbia and
Oregon. 95 % confidence intervals for DBH on this locality are presented on
Figure 1.

For volume value on locality Mikleuška it is determined that there is no
statistically significant difference among four existing provenances (Cortage
Grove-Oregon; Centralia-Washington; Cascadia-Oregon and Ashland-Oregon).
95 % confidence intervals for volume on this locality are presented in
Figure 2.

On the basis of presented results we conclude that provenances with the
best success for all localities are those which originate from lower altitudes
(0-300 m a. s. l.)of The State of Washington (Elma, Tenino) and Europe (Hvidilde
from Denmark and Šipka from Bulgaria). As those provenances showed
the best success in continental part of Croatia we recommend that they should
be used for establishment of new cultures in Croatia.

High production and wood quality together with wide range of ecological
conditions places Douglas fir on significant position for new forest culture
establishment in Croatia. New scientific knowledge highlights its significance
in the scope of climate changes where it is recognized as species of beneficial
biological properties.

This project was conducted under auspices of “Hrvatske šume” Ltd., so we
would like to use this opportunity to express our sincere thanks for financial
help as well as to thank all employees of forest and administration offices for
their immense help.

Key words:Douglas fir, forest cultures, success, provenance, Croatia.