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Query: "keywords" (Douglas fir) .

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1.
Interakcija između efekata genetskestrukture i stanišnih uslova narast zelene duglazije u testovimaprovenijencija u Bosni i Hercegovini
Mirzeta Memišević Hodžić, Dalibor Ballian, Emina Šehović, 2020, original scientific article

Abstract: Douglas fir (Pseudotsuga menziesii (Mirbel) Franco) is the most important and most productive species in Eu-rope, outside its natural range. This study aimed to examine the presence of interaction between the effects of the genetic structure of provenances from the United States and Canada and three localities of provenan-ce tests in Bosnia and Herzegovina.For this research, we measured diameters at breast height of all trees, and heights of 10 trees per provenance in three tests of Douglas fir at the age of plants 32 years. Four provenances are represented in all three tests and additional two provenances in two tests. We examined the variance between provenances and habitats using multivariate analysis, for four provenances in all three habitats, and six provenances in two habitats (Bo-sanska Gradiška and Zavidovići).Multivariate analysis of variance for four provenances at all three localities showed that there were no stati-stically significant differences in diameters at breast height and heights caused by the interaction of provenan-ces x localities. Multivariate analysis for six joint provenances at Bosanska Gradiška and Zavidovići tests showed that there were no statistically significant differences for diameter at breast height caused by interac-tion locality x provenance, and there were statistically significant differences caused by interactions of locality x provenances for height.The obtained results can be used for the introduction of Douglas fir on predefined habitats that correspond to the conditions of the experimental plots, as well as for the selection of the best provenances for raising clone plantations or seed plantations
Keywords: Douglas fir, provenances, interaction provenance x habitat
Published in DiRROS: 08.03.2023; Views: 359; Downloads: 151
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2.
Non-native forest tree species in Europe : ǂthe ǂquestion of seed origin in afforestation
Paraskevi Alizoti, Jean-Charles Bastien, Debojyoti Chakraborty, Marcin Miroslav Klisz, Johan Kroon, Charalambos Neophytou, Silvio Schueler, Marcela van Loo, Marjana Westergren, Monika Konnert, Robert Brus, 2022, original scientific article

Abstract: Non-native forest tree species have been introduced in Europe since the 16th century, but only in the second half of the 20th century the significance of the seed source origin for their economic use was recognized, resulting in the establishment of numerous provenance trials at a national, regional, European and International level, as those led by IUFRO. Breeding programs have also been launched in the continent for the most economically important species. Aim of this work is the formulation of provenance recommendations for planting of five non-native tree species in Europe (Douglas fir, grand fir, Sitka spruce, lodgepole pine and black locust), based on the information obtained from twenty countries, in the frame of the EU FP-1403 NNEXT Cost Action. The survey revealed that official and non-official national recommendations, based on provenance research results, have been elaborated and followed at a different level and extend for the above five species, but only for Douglas fir recommendations exist in almost all the participating to the survey countries. The compilation of provenance recommendations across Europe for each species is presented in the current work. Besides the recommended introduced seed sources, European seed sources are also preferred for planting, due to ease of access and high availability of forest reproductive material. European breeding programs yielding genetic material of high productivity and quality constitute currently the seed source of choice for several species and countries. Consolidation of trial data obtained across countries will allow the joint analysis that is urgently needed to draw solid conclusions, and will facilitate the development of ‘Universal-Response-Functions’ for the species of interest, rendering possible the identification of the genetic material suitable for global change. New provenance trial series that will test seed sources from the entire climatic range of the species, established in sites falling within and outside the environmental envelopes of their natural ranges, are urgently needed to pinpoint and understand the species-specific climate constraints, as well as to correlate functional traits to the seed origin and the environmental conditions of the test sites, so that the selection of suitable forest reproductive material of non-native tree species in the face of climate change can be feasible.
Keywords: provenance recommendations, provenance testing, breeding programs, adaptation, exotic tree species, Douglas fir, Sitka spruce, grand fir, lodgepole pine, black locust
Published in DiRROS: 09.02.2022; Views: 800; Downloads: 630
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3.
Microsites influence the light response of young douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)
Matjaž Čater, 2021, original scientific article

Abstract: Two comparable sites with uneven-aged mixed forest stands with more than 20% Douglas-fir in the growing stock at an altitude of 650 m a.s.l. were selected. The physiological response of young trees to different light intensities was measured during the main growing season in three consecutive years, and four different light categories, which were determined from hemispherical photographs. The four light intensity categories were defined according to Indirect Site Factor (ISF%): in the open (A-ISF > 35%), at the outer forest edge (B-25% < ISF < 35%), at the inner forest edge (C-15% < ISF < 25%), and under complete canopy under mature forest stand (D-ISF < 15%). Climate data were obtained from the Royal Netherlands Meteorological Institute %Climate Explorer% website. For the intensive micrometeorological observations, four monitoring sites were established along the elevation gradient at each site during summer and late fall to record relative humidity (RH%) and temperature (°C) with a 30 min recording interval sequence. Measured assimilation responses (A) and light use efficiency (%) at one site followed the expected pattern, while humidity combined with microsite conditions proved significant in explaining the specific response of young Douglas-fir to the different light intensity at the other site. For higher survival and optimal future development of Douglas-fir in the changing environment, microsites with higher capacity for storage moisture and favorable microclimate should generally be preferred to exposed and dry sites.
Keywords: Douglas-fir, light response, photosynthesis, light use efficiency, silviculture
Published in DiRROS: 28.05.2021; Views: 944; Downloads: 690
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