prilagođeno pretraživanje po punom tekstu

ŠUMARSKI LIST 13/2011 str. 202     <-- 202 -->        PDF

S. Perić, M. Tijardović, A. Jazbec: REZULTATI ISTRAŽIVANJAPROVENIJENCIJAZELENE DUGLAZIJE U ... Posebni broj Šumarskog lista, (2011), 1-3

SUMMARY: Establishment of forest cultures in Croatia begun around
1970s. Since then, share of cultures in Croatian forest fund varies while today
it amounts to about 3 %. New scientific knowledge points out to justifiable
reasons of further and enhanced establishment of Douglas fir cultures in
Croatia (especially spontaneous increase of suitable areas for their establishment
such as former agricultural land). This paper presents results of scientific
Douglas fir research conducted in the scope of project “Management of
conifer cultures”. Numerous trials which have been established during the
last 40 years (in the scope of activities of Croatian forest institute) with the
aim of determining the most suitable provenances for establishment of conifer
cultures in Croatia have provided first results. According to those results Douglas
fir showed best growth success among all investigated species.

Douglas fir is one of the most valuable and important specie for timber production
in the world. Combination of high quality wood with high productivity
places Douglas fir on the top of the world’s timber production. In the country of
its natural distribution this specie is the object of numerous scientific publications,
while the research on Douglas fir success in Europe was conducted
mostly in the scope of culture establishment. Its natural distribution spreads in
the west part of North America. This specie is successfully introduced in almost
all areas of temperate region in the world (Europe, southern part of South
America and Australia) and in New Zealand. Douglas fir cultures occupies immense
areas in North America where this species is naturally distributed.

Douglas fir successfully adapts to broad range of site conditions, while provides
high incomes and high quality products. It successfully grows in different
climatic conditions, especially on deep and aerated soils, with pH 5–6, while
on heavy soils with higher water content shows lower success. Although Douglas
fir is the specie with deep root system, morphology of roots depends on
soil properties. In the context of climate change Douglas fir seems to be very
interesting commercial specie for Europe since it adapts easier to conditions of
temperature increase and rainfall decrease during the vegetation period. Consequently,
Douglas fir could be superior to Norway spruce which is currently
most important economic specie in the Europe. Those characteristics, together
with results of former research conducted on its success, makes Douglas fir
suitable for establishment of new cultures on non-forest land in Croatia.

As a result of all above mentioned information, part of this research was focused
on analysis of Douglas fir provenances success 40, 42 and 45 years after
culture establishment on three different localities of continental part of Croatia.
Research on Douglas fir growth success was conducted in the 40th year
after trial establishment on locality Durgutovica (Forest administration Vinkovci,
Vinkovci forest office, ,) in the 42nd year on Slatki Potok locality (Forest
administration Bjelovar, Veliki Grđevac forest office), and in the 45th year on
the locality Mikleuška (Forest administration Zagreb, Kutina forest office).
Trials were established in randomized block design in four repetitions. Trials
include 23 different provenances in total (on all investigated localities – presented
in Table 1). 19 provenances originate from areas of its natural distribution,
mainly from lower altitudes (6 from Oregon, 3 from British Columbia and
10 from Washington). Four provenances originate from Europe, two of whichare from Croatia (Rovinj and Skrad), one from Bulgaria (Šipka) and one from
Denmark (Hvidilde). Statistical analysis which has been conducted for all
measured parameters (DBH, height, volume) on all localities showed statistically
significant difference between provenances in the case of provenances on
localities Durgutovica and Slatki Potok, while there is no difference between
provenances on Mikleuška locality (presented in Tables 3, 4 and 5 for volume).
Descriptive statistics for all localities, provenances and parameters is presented
in Table 2.