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Inovacije in digitalno podprte rešitve na področju mobilizacije lesa
Polona Hafner, 2020

Ključne besede: ROSEWOOD4.0, digitalna orodja, gozdno-lesna veriga
DiRROS - Objavljeno: 14.12.2020; Ogledov: 860; Prenosov: 235
.pdf Celotno besedilo (66,79 KB)

The effect of bedrock and species mixture on wood density and radial wood increment in pubescent oak and black pine
Jožica Gričar, Polona Hafner, Luka Krajnc, 2020

Povzetek: Wood density and radial wood increment were examined in trees of pubescent oak (Quercus pubescens Willd.) and black pine (Pinus nigra Arnold., subsp. nigra) in relation to stand mixture and underlying bedrock. Trees of both species from pure and mixed stands were sampled across two types of bedrock, limestone and flysch. Trees from each species were similar in age. Wood density was estimated in standing trees using resistance drilling and increment cores were taken from a smaller subsample of trees of both species. Tree-ring, earlywood and latewood widths were measured and compared to radial profiles of wood density. The influence of stand mixture, diameter at breast height and bedrock on wood density was examined using a Bayesian general linear model. Wood density was significantly higher in pubescent oak than in black pine. Stand mixture was found to affect wood density positively, although the magnitude of the effect was relatively small when compared to other influencing factors also included in the current study. The effect of diameter on wood density was positive on both bedrocks in pubescent oak and negative or neutral in black pine. The size of the effect varied by bedrock and species. On flysch bedrock, the influence of diameter on wood density was stronger than it was on limestone. These indirect bedrock effects on wood density are probably a result of different soil fertility rather than the bedrock itself. There was a notable difference in radial wood increment in both species across the two bedrocks, whereas the differences in densities were smaller. Higher wood densities found on flysch in the subsample of pubescent oaks are likely an effect of higher proportions of latewood, while the opposite trend was observed in black pine. Higher wood density was found on limestone in black pine despite higher latewood percentages on flysch. In the context of forest management, the species composition of the naturally occurring mixtures in the sub-Mediterranean region should be adjusted slightly to favor pubescent oak, since it is a climax species and will bind more carbon for longer than black pine due to higher wood densities. Future forest management should also promote the overall development of pubescent oak trees in sub-Mediterranean stands. The results are especially important in the European context, because the share of sub-Mediterranean stands is expected to rise with global warming.
Ključne besede: Karst, wood structure, resistograph, resistance drilling, Quercus pubescens, Pinus nigra, limestone, flysch
DiRROS - Objavljeno: 14.01.2021; Ogledov: 633; Prenosov: 25
.pdf Celotno besedilo (1,42 MB)

Gozdnogojitveni ukrepi in njihov vpliv na kvaliteto lesa
Polona Hafner, Mitja Skudnik, 2021

Ključne besede: licitacija lesa, kvaliteta lesa, gozdnogojitveni ukrepi
DiRROS - Objavljeno: 08.03.2021; Ogledov: 646; Prenosov: 234
.pdf Celotno besedilo (45,63 KB)

Poseganje v naravni razvoj gozdnih rezervatov?
Polona Hafner, Mitja Skudnik, 2021

Ključne besede: gozdni rezervati, pragozdovi, sanitarne sečnje, sprememba zakonodje
DiRROS - Objavljeno: 14.04.2021; Ogledov: 652; Prenosov: 252
.pdf Celotno besedilo (46,37 KB)

Želja po ponovni vzpostavitvi ravnovesja v okolju
Polona Hafner, Mitja Skudnik, 2021

DiRROS - Objavljeno: 17.05.2021; Ogledov: 521; Prenosov: 205
.pdf Celotno besedilo (44,36 KB)

Upravljanje z mestnimi gozdovi za boljšo kakovost bivanja v mestih
Polona Hafner, Mitja Skudnik, 2021

DiRROS - Objavljeno: 02.08.2021; Ogledov: 519; Prenosov: 163
.pdf Celotno besedilo (45,01 KB)

Climatic regulation of leaf and cambial phenology in Quercus pubescens : their interlinkage and impact on xylem and phloem conduits
Jožica Gričar, Jernej Jevšenak, Polona Hafner, Peter Prislan, Mitja Ferlan, Martina Lavrič, Dominik Vodnik, Klemen Eler, 2022

Povzetek: Increased frequency and severity of stressful events affects the growth patterns and functioning of trees which adjust their phenology to given conditions. Here, we analysed environmental effects (temperature, precipitation, VPD and SWC) on the timing of leaf phenology, seasonal stem radial growth patterns, and xylem and phloem anatomy of Quercus pubescens in the sub-Mediterranean in the period 2014%2019, when various adverse weather events occurred, i.e. spring drought in 2015, summer fire in 2016 and summer drought in 2017. Results showed that the timings of leaf and cambium phenology do not occur simultaneously in Q. pubescens, reflecting different environmental and internal constraints. Although year-to-year variability in the timings of leaf and cambial phenology exists, their chronological sequence is fairly fixed. Different effects of weather conditions on different stages of leaf development in spring were observed. Common climatic drivers (i.e., negative effect of hot and dry summers and a positive effect of increasing moisture availability in winter and summer) were found to affect the widths of xylem and phloem increments with more pronounced effect on late formed parts. A legacy effect of the timing of leaf and cambial phenology of the previous growing season on the timing of phenology of the following spring was confirmed. Rarely available phloem data permitted a comprehensive insight into the interlinkage of the timing of cambium and leaf phenology and adjustment strategies of vascular tissues in Mediterranean pubescent oak to various environmental constraints, including frequent extreme events (drought, fire). Our results suggest that predicted changes in autumn/winter and spring climatic conditions for this area could affect the timings of leaf and stem cambial phenology of Q. pubescens in the coming years, which would affect stem xylem and phloem structure and hydraulic properties, and ultimately its performance.
Ključne besede: pubescent oak, leaf development, radial growth, initial earlywood vessel, sieve tube, anatomy, cambial cell production, extreme weather events
DiRROS - Objavljeno: 06.09.2021; Ogledov: 425; Prenosov: 82
.pdf Celotno besedilo (7,00 MB)

Aktivni lastniki gozdov in njihov prispevek k prehodu v brezogljično družbo
Polona Hafner, Mitja Skudnik, 2021

DiRROS - Objavljeno: 26.10.2021; Ogledov: 316; Prenosov: 117
.pdf Celotno besedilo (423,00 KB)

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