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Razvoj in uporaba simulatorja razvoja gozdov MLFS za analizo bodočih stanj slovenskih gozdov
Jernej Jevšenak, Domen Arnič, Luka Krajnc, Peter Prislan, Mitja Skudnik, 2023, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: simulator razvoja gozdov, napovedovanje stanja gozda
Objavljeno v DiRROS: 04.10.2023; Ogledov: 144; Prenosov: 31
.pdf Celotno besedilo (102,17 KB)

Makroekonomski učinki proizvodnje in predelave lesa listavcev
Domen Arnič, Peter Prislan, Luka Juvančič, 2023, izvirni znanstveni članek

Povzetek: As far as the utilization of the value-added potential of hardwood assortments is concerned, we have considerable reserves in Slovenia. These could be exploited mainly by increasing the economic use of roundwood in Slovenia and by developing more technologically advanced processing methods for roundwood. The aim of this paper is to assess the untapped potential of the forest-wood chain in Slovenia using input-output models, focusing on the use of hardwood. For the whole forest-wood chain, we assessed the existing situation and tested five scenarios for the improvement of the forest-wood chain in Slovenia. We developed a national input-output model to evaluate possible scenarios for the future development of the wood-based bioeconomy. The results of scenario analysis of the input-output model show that the Slovenian wood-based bioeconomy can achieve up to 20% higher production value, a 24% increase in employment and 19% increase in household income in the future through restructuring of economic activities. In the paper, we discuss how upgrading the forestry and wood-processing industry (according to the defined scenarios) could be achieved by increasing the processing capacity of hardwoods and provide recommendations for decision makers.
Ključne besede: forest- and wood-based bioeconomy, hardwoods utilization, input-output models, wood processing industry, scenario analysis, mobilization of hardwoods
Objavljeno v DiRROS: 03.08.2023; Ogledov: 173; Prenosov: 102
.pdf Celotno besedilo (1,21 MB)
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Analiza kakovostne strukture okroglega lesa listavcev
Luka Krajnc, Domen Arnič, Peter Prislan, 2023, izvirni znanstveni članek

Povzetek: The research presented in this study addressed the distribution of volume across different log grades in three hardwood species: European beech (Fagus sylvatica L.), sycamore maple (Acer pseudoplatanus L.) and English oak (Quercus robur L.). Standing trees were selected, marked, and measured. Afterwards the trees were felled and bucked into assortments according to national legislation regarding assortment grades and requirements for each assortment grade. Each individual assortment was measured and classified into one of the national log quality grades. Proportions of log volume with different grades within individual tree volumes were calculated and presented in this study. Differences were found in log grade volume distribution between different species and diameter classes. By following the national grading system for assortments, between 40% and 50% of total volume will be usable assortments in hardwoods
Ključne besede: logs, hardwoods, volume, quality, log grading
Objavljeno v DiRROS: 03.08.2023; Ogledov: 172; Prenosov: 88
.pdf Celotno besedilo (5,01 MB)
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Different wood anatomical and growth responses in European beech (Fagus sylvatica L.) at three forest sites in Slovenia
Domen Arnič, Jožica Gričar, Jernej Jevšenak, Gregor Božič, Georg von Arx, Peter Prislan, 2021, izvirni znanstveni članek

Povzetek: European beech (Fagus sylvatica L.) adapts to local growing conditions to enhance its performance. In response to variations in climatic conditions, beech trees adjust leaf phenology, cambial phenology, and wood formation patterns, which result in different treering widths (TRWs) and wood anatomy. Chronologies of tree ring width and vessel features [i.e., mean vessel area (MVA), vessel density (VD), and relative conductive area (RCTA)] were produced for the 1960%2016 period for three sites that differ in climatic regimes and spring leaf phenology (two early- and one late-flushing populations). These data were used to investigate long-term relationships between climatic conditions and anatomical features of four quarters of tree-rings at annual and intra-annual scales. In addition, we investigated how TRW and vessel features adjust in response to extreme weather events (i.e., summer drought). We found significant differences in TRW, VD, and RCTA among the selected sites. Precipitation and maximum temperature before and during the growing season were the most important climatic factors affecting TRW and vessel characteristics. We confirmed differences in climate-growth relationships between the selected sites, late flushing beech population at Idrija showing the least pronounced response to climate. MVA was the only vessel trait that showed no relationship with TRW or other vessel features. The relationship between MVA and climatic factors evaluated at intra-annual scale indicated that vessel area in the first quarter of tree-ring were mainly influenced by climatic conditions in the previous growing season, while vessel area in the second to fourth quarters of tree ring width was mainly influenced by maximum temperature and precipitation in the current growing season. When comparing wet and dry years, beech from all sites showed a similar response, with reduced TRW and changes in intra-annual variation in vessel area. Our findings suggest that changes in temperature and precipitation regimes as predicted by most climate change scenarios will affect tree-ring increments and wood structure in beech, yet the response between sites or populations may differ.
Ključne besede: Fagus sylvatica, wood anatomy, tracheograms, dendrochronology, intra specific plasticity
Objavljeno v DiRROS: 22.07.2022; Ogledov: 391; Prenosov: 283
.pdf Celotno besedilo (15,28 MB)
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A comparison of radial increment and wood density from beech provenance trials in Slovenia and Hungary
Luka Krajnc, Peter Prislan, Gregor Božič, Marjana Westergren, Domen Arnič, Csaba Mátyás, Jožica Gričar, Hojka Kraigher, 2022, izvirni znanstveni članek

Povzetek: Provenance trials are a valuable source of information, especially in species such as European beech (Fagus sylvatica L.), which will likely increase its distribution due to global warming. The current study compares radial increment and wood density of beech provenances in the juvenile development stage from contrasting environments in Europe (Belgium, Slovenia, Czech Republic, Italy) planted at a mesic to wet site in Slovenia and a xeric site in Hungary. Existing data (past measurements of diameters and height) were combined with new measurements of tree height, diameter, dendrochronological and resistance drilling density measurements to assess differences in provenance radial growth. The wood density data were evaluated using a Bayesian general linear model. In order to study the differences in radial increment in more detail, two weather-wise contrasting years (2014 and 2017) were selected from the last decade, based on calculations of the 12-month Standardized Precipitation-Evapotranspiration Index. The differences in average tree-ring width among provenances at each sampled site appeared to be relatively small when averaged over a whole decade of data. However, according to year-to-year data, some provenances grew faster than others, especially in favorable weather conditions. In unfavorable conditions, the differences in tree-ring widths among provenances were smaller. For most provenances, variation in tree-ring widths within the same provenance increased in unfavorable conditions. The difference between the provenances with the highest and lowest wood densities at both locations did not exceed 5%. The model results indicate that the Idrija (Slovenia) provenance probably has a higher median wood density than other studied provenances at both sites. Although the current study confirmed some differences in wood density between provenances and trial locations, the differences are negligible in practice due to their low magnitude and the fact that the analyzed trees were still juvenile. As beech has a diffuse-porous wood, negligible differences in wood density would also be expected in adult trees. Beech provenances for planting in relation to changing weather should probably be chosen for their ability to survive more extreme weather events rather than to improve radial increment or wood density, especially as the differences in wood density of juvenile trees are relatively small.
Ključne besede: Fagus sylvatica, tree-ring width, common garden, resistance drilling
Objavljeno v DiRROS: 15.04.2022; Ogledov: 494; Prenosov: 394
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Relationships between wood-anatomical features and resistance drilling density in Norway spruce and European beech
Domen Arnič, Luka Krajnc, Jožica Gričar, Peter Prislan, 2022, izvirni znanstveni članek

Povzetek: Environmental conditions affect tree-ring width (TRW), wood structure, and, consequently, wood density, which is one of the main wood quality indicators. Although studies on inter- and intra-annual variability in tree-ring features or density exist, studies demonstrating a clear link between wood structure on a cellular level and its effect on wood density on a macroscopic level are rare. Norway spruce with its simple coniferous structure and European beech, a diffuse-porous angiosperm species were selected to analyze these relationships. Increment cores were collected from both species at four sites in Slovenia. In total, 24 European beech and 17 Norway spruce trees were sampled. In addition, resistance drilling measurements were performed just a few centimeters above the increment core sampling. TRW and quantitative wood anatomy measurements were performed on the collected cores. Resistance drilling density values, tree-ring (TRW, earlywood width–EWW, transition-TWW, and latewood width–LWW) and wood-anatomical features (vessel/tracheid area and diameter, cell density, relative conductive area, and cell wall thickness) were then averaged for the first 7 cm of measurements. We observed significant relationships between tree-ring and wood-anatomical features in both spruce and beech. In spruce, the highest correlation values were found between TRW and LWW. In beech, the highest correlations were observed between TRW and cell density. There were no significant relationships between wood-anatomical features and resistance drilling density in beech. However, in spruce, a significant negative correlation was found between resistance drilling density and tangential tracheid diameter, and a positive correlation between resistance drilling density and both TWW + LWW and LWW. Our findings suggest that resistance drilling measurements can be used to evaluate differences in density within and between species, but they should be improved in resolution to be able to detect changes in wood anatomy.
Ključne besede: wood structure, Fagus sylvatica, Picea abies, quantitative wood anatomy, xylem anatomy, wood density, increment borer
Objavljeno v DiRROS: 08.04.2022; Ogledov: 476; Prenosov: 361
.pdf Celotno besedilo (3,23 MB)
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Sodobna izhodišča redčenj : povezovanje načel izbiralnega redčenja, situacijskega redčenja, redčenja šopov in skupin ter redčenja spremenljive gostote
Jurij Diaci, Dušan Roženbergar, Gal Fidej, Domen Arnič, 2021, strokovni članek

Povzetek: V Evropi so razširjeni različni načini redčenj, ki so delno odgovor na različne cilje gospodarjenja; delno so posledica tradicije in različnih kulturnih okolij. S spremembami v okolju in zaostrovanjem družbeno-ekonomskih razmer ter splošnim nazadovanjem nege gozdov postajajo odločitve o najprimernejšim načinu in intenzivnosti redčenj vse pomembnejše. V prispevku primerjamo situacijsko redčenje, redčenje šopov in skupin, redčenje spremenljive gostote in pri nas ustaljeno izbiralno redčenje. Navajamo usmeritve, kako redčenja kombinirati ter kako izbrati primeren način in program redčenj. Na temelju sinteze dosedanjih raziskav izpostavljamo, da so za utemeljeno izboljšanje načinov redčenj pomembni poskusi v naravi.
Ključne besede: gojenje gozdov, nega gozda, redčenje, racionalizacija, stabilnost sestoja, porazdelitev izbrancev
Objavljeno v DiRROS: 29.10.2021; Ogledov: 1086; Prenosov: 334
.pdf Celotno besedilo (572,76 KB)

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