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40 YEARS OF DOUGLAS FIR MONITORING IN CROATIA

Douglas fir (Pseudotsuga menziesii (Mirb.)) is one of the most productive and economically interesting tree species in the world, especially on the area of it’s natural range (USA). Because of it’s broad natural range of success, in horizontal as well as in the vertical sense (from California to British Columbia and from the see level up to 1500 m of altitude) a variety of it’s provenances has been differentiated. European foresters, because of their insight on Douglas fir productivity and usage in it’s native country have initiated, at the beginning of the 20th century, establishment of provenance tests and research on individual provenances success outside of their natural distribution. In the frame of IUFRO programme Croatia have started, among numerous European countries, with the establishment of provenance tests with the aim of research on adaptability of this valuable species. The aim of the research presented in this paper was to determine success of Douglas fir provenances on different bioclimatic localities in Croatia (Istria, NW, Central and Eastern part of Croatia). This paper presents an overview of monitoring of success on trial plots which were established in the year 1969. Therefore, monitoring of success of different provenances have been conducted in the period of 40 years. Besides different bioclimates, trials encompass different areas according to previous land-use (forest land, former agricultural land and fern and heat areas). They also show us success according to different type of soil. Overall conclusion is that monitored provenances showed good success in relation to other investigated alochtonous species. This places Douglas fir on significant position in afforestation activities with even bigger importance in the conditions of changing climate. The importance is also evident through biodiversity and survival conservation of our natural forest ecosystems, since wood production in forest cultures significantly reduces production pressure on natural forest stands.  

Douglas fir; provenances; adaptability; different bioclimates; land-use; survival; success

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