magistrsko delo
Peter Smolnikar (Author), Robert Brus (Mentor)

Abstract

Navadna ameriška duglazija je tujerodni iglavec z zahodne pacifiške obale, v evropske gozdove je bil vnesen že ob koncu 19. stoletja. Nasadi duglazije so se ob preteklih ujmah v Sloveniji odlično izkazali in zanimanje za njen vnos se povečuje. Izbira GRM (gozdni reprodukcijski material) za območje temelji na rezultatih provenienčnih testov. V Brkinih smo premerili provenienčni test 16-ih provenienc zelene duglazije, osnovan leta 1971 v okviru projekta IUFRO. S Kruskal-Wallisovim testom smo zaznali razlike v priraščanju, vitalnosti in kakovosti dreves med proveniencami. Tarifni izračun lesne zaloge 46-letnega nasada znaša 602,9 m3/ha, povprečno preživetje v neredčenem nasadu je 43-odstotno, po vitalnosti in doseženem povprečnem prsnem premeru (36,1 cm) se pozitivno najbolj razlikuje provenienca Yelm iz zahodnega Washingtona, negativno pa Merrit iz Britanske Kolumbije. V nasadu zaradi slabega čiščenja vej ni sortimentov višje kakovosti kakor C. Ugotavljamo, da se v Brkinih najbolje obnesejo provenience zahodnega (obalnega) dela Washingtona, optimalna izbira je Cathlamet, katere vrednosti so vse nadpovprečne. Duglazija je izredno variabilna drevesna vrsta, odkrivanje statistično značilnih razlik med proveniencami je oteženo zaradi visoke variabilnost drevesnih znakov znotraj same provenience. Ob napovedanih klimatskih spremembah (dvig temperatur in suše) se kaže priložnost za povečan obseg saditve z ameriško duglazijo na določena mesta kjer propada smreka. Modeli klimatskih sprememb in rezultati provenienčnih testov so podlaga za izbiro optimalne provenience in lokacije vnosa.

Keywords

navadna ameriška duglazija;provenienca;GRM;Brkini;Slovenija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [P. Smolnikar]
UDC: 630*17+630*23(497.4 Brkini)(043.2)=163.6
COBISS: 5134502 Link will open in a new window
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Other data

Secondary language: English
Secondary title: Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) on international provenance trial at Brkini
Secondary abstract: Douglas fir is an exotic conifer from the western Pacific coast which was introduced into European forests at the end of the 19th century. Douglas fir plantations in Slovenia have proved to be excellent in resisting natural disasters so far. The selection of FRM (forest reproductive material) for the site of forestation is based on the results of provenance tests. In the Brkini region, the provenance test of 16 provenances was established within the framework of IUFRO project of the year 1971. A total yield is 602.9 m3/ha, the average survival rate is 43%. According to the vitality and the achieved diameter, the most positively deviating provenance is Yelm (West Washington), while Merrit (British Columbia) deviates negatively. Overall, the stand has no higher quality assortments than class C. According to the observed signs, the optimal choice would be provenance Cathlamet (Western coastal Washington). Douglas fir is an extremely variable tree species, the detection of statistically significant differences between provenances is aggravated by the high variability of tree signs within the provenance itself. With predicted climate change (rising temperatures and droughts), afforestation with an allochthonous conifer Douglas fir might be a possible substitute for the affected spruce. Models of climate change and the results of provenance tests are the basis for choosing the optimal provenances and location of their input.
Secondary keywords: Douglas fir;provenance;FRM;Brkini;Slovenia;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Biotehniška fak., Oddelek za gozdarstvo in obnovljive gozdne vire
Pages: IX f., 67 f., [1] f. pril.
ID: 10944116