1651. Značilnosti lesnih prirastkov v deblu in vejah oljke (Olea europaea L.)Jožica Gričar, Klemen Eler, 2025, original scientific article Abstract: Oljka (Olea europaea L.) je gospodarsko zelo pomembna vednozelena kulturna rastlina, a je zelo malo znanega o njeni strukturi lesa v različnih delih drevesa, ki je ključna za dolgoročno preživetje drevesa. V pričujočem prispevku smo primerjali značilnosti lesnih prirastkov v deblu in vejah pri oljki v Dekanih v rastni sezoni 2016. Analizirali smo tudi prevodne elemente v lesu (traheje) v posameznih tretjinah lesnih branik. Razlike v značilnostih trahej na začetku in koncu rastne sezone ter v različnih delih drevesa smo interpretirali z vidika njihove prevajalne vloge v drevesu. V ta namen smo vzorce lesa odvzeli po zaključku rastne sezone 2016, pripravili preparate prečnih prerezov in opravili histometrične analize s pomočjo svetlobnega mikroskopa in sistema za analizo slike. Ugotovili smo, da se širine lesnih prirastkov in značilnosti trahej v deblu in vejah oljk razlikujejo. Prirastki 2016 so bili v vejah približno 54 % ožji kot v deblu, površine trahej pa od 25 % (prva tretjina) do 34 % (zadnja tretjina) manjše. Površine trahej so bile primerljive v prvi in drugi tretjini branike, medtem ko je bila v zadnji tretjini površina značilno manjša, in sicer v povprečju za 17,6 % v deblu in 25,4 % v vejah. V vseh tretjinah lesnih branik v deblu in vejah smo zabeležili negativno zvezo med povprečnimi vrednostmi površine trahej in gostoto trahej. Pri oljkah se je to odražalo v primerljivih vrednostih hidravlične prevodnosti v vseh tretjinah v deblu in vejah. Ožji prevodni elementi v vejah oljk kot posledica hormonske regulacije so v skladu z univerzalno pozitivno zvezo med velikostjo trahej in oddaljenostjo od apeksa in so povezani z večjo tenzijsko napetostjo vodnih stolpcev v trahejah vej v primerjavi z deblom. Različna struktura lesa v deblu in vejah nakazuje na različno vlogo tega tkiva v različnih delih drevesa.
Keywords: les, branika, difuzno-porozna vrsta, traheja, anatomija lesa, prevodnost, svetlobna mikroskopija
Published in DiRROS: 10.07.2025; Views: 338; Downloads: 179
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1652. Biocompatible carbon dots/polyurethane composites as potential agents for combating bacterial biofilms : N-doped carbon quantum dots/polyurethane and gamma ray-modified graphene quantum dots/polyurethane compositesZoran Marković, Slađana Dorontić, Svetlana P. Jovanović, Janez Kovač, Dušan Milivojević, Dragana Marinković, Marija Mojsin, Biljana Todorović-Marković, 2024, original scientific article Abstract: Pathogen bacteria appear and survive on various surfaces made of steel or glass. The existence of these bacteria in different forms causes significant problems in healthcare facilities and society. Therefore, the surface engineering of highly potent antimicrobial coatings is highly important in the 21st century, a period that began with a series of epidemics. Methods: In this study, we prepared two types of photodynamic polyurethane-based composite films encapsulated by N-doped carbon quantum dots and graphene quantum dots irradiated by gamma rays at a dose of 50 kGy, respectively. Further, we investigated their structural, optical, antibacterial, antibiofouling and biocompatibility properties. Results: Nanoelectrical and nanomechanical microscopy measurements revealed deviations in the structure of these quantum dots and polyurethane films. The Young’s modulus of elasticity of the carbon and graphene quantum dots was several times lower than that for single-walled carbon nanotubes (SWCNTs) with chirality (6,5). The electrical properties of the carbon and graphene quantum dots were quite similar to those of the SWCNTs (6,5). The polyurethane films with carbon quantum dots were much more elastic and smoother than the films with graphene quantum dots. Antibacterial tests indicated excellent antibacterial activities of these films against a wide range of tested bacteria, whereas the antibiofouling activities of both composite films showed the best results against the Staphylococcus aureus and Escherichia coli biofilms. Biocompatibility studies showed that neither composite film exhibited any cytotoxicity or hemolysis. Conclusions: Obtained results indicate that these composite films could be used as antibacterial surfaces in the healthcare facilities.
Published in DiRROS: 10.07.2025; Views: 413; Downloads: 136
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1653. Temperature-driven shifts in spatiotemporal stability of climate-growth responses of Douglas-fir (Pseudotsuga menziesii) from the southern Baltic Sea regionMarcin Miroslav Klisz, Radosław Puchałka, Mariusz Gławenda, M. Koprowski, Roberts Matisons, Sandra Metslaid, Aleksei Potapov, Tobias Scharnweber, Eric Andreas Thurm, Rita Verbylaite, Adomas Vitas, Martin Wilmking, Jernej Jevšenak, 2025, original scientific article Abstract: The southern Baltic region spans a significant part of the European continent with its forests under significant pressure due to climate changes. The implications of these changes are crucial for both native and non-native tree species. Under future climate scenarios, most native conifer populations might lose their climatic optima in the region. In contrast, for non-native Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), climatic conditions are expected to become optimal in the Baltic Sea region. Therefore, understanding the acclimatisation trajectory of Douglas-fir over the last century is essential to assess its potential to supplement retreating species and reduce pressure on local habitats. To study the region-wide acclimatisation in the secondary distribution, we established a network of 27 Douglas-fir tree-ring chronologies along the south Baltic Sea. We determined the spatio-temporal stability of the climate signal in tree rings and the potential coastal effect on the plasticity of the growth response. We found a region-wide trend of climate-growth relationships, with a dominant effect of the early-growth season temperatures being more pronounced for mature than young stands. Sites with higher mean annual temperatures exhibit a stronger positive temperature–growth correlation, demonstrating the sensitivity of Douglas-fir to climate warming. Douglas-fir could serve as a more heat-tolerant alternative to the declining European species of the Pinaceae family and contribute to the preservation of functionally comparable coniferous forest communities. However, forest practitioners should be aware that Douglas-fir may alter habitat conditions affecting microclimate and influencing species diversity.
Keywords: climate warming, climate–growth relationships, dendroecology, Europe, tree growth
Published in DiRROS: 09.07.2025; Views: 445; Downloads: 370
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1656. Capacity-building for gender awareness and competences in forestry educationNike Krajnc, Darja Stare, Polona Hafner, Katarina Flajšman, Mateja Karničnik, Tatjana Pavlič, Ema Šumenjak, Sabina Majerič, Špela Pezdevšek Malovrh, Zala Uhan, 2025, treatise, preliminary study, study Keywords: forestry, gender equality, youth employment, employment, sustainable development, environmental education
Published in DiRROS: 09.07.2025; Views: 418; Downloads: 257
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1657. Good practice examples of career orientation in forestry : collection of good practice examples that help to counteract stereotypes and spark curiosity about the world of forestryNike Krajnc, Darja Stare, Polona Hafner, Katarina Flajšman, Mateja Karničnik, Tatjana Pavlič, Ema Šumenjak, Sabina Majerič, Špela Pezdevšek Malovrh, Zala Uhan, 2025, treatise, preliminary study, study Keywords: forestry, gender equality, youth employment, employment, sustainable development, environmental education
Published in DiRROS: 09.07.2025; Views: 477; Downloads: 261
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1658. Compilation of good practice examples of career orientation in forestryNike Krajnc, Darja Stare, Polona Hafner, Katarina Flajšman, Mateja Karničnik, Tatjana Pavlič, Ema Šumenjak, Sabina Majerič, Špela Pezdevšek Malovrh, Zala Uhan, 2025, treatise, preliminary study, study Keywords: forestry, gender equality, youth employment, employment, sustainable development, environmental education
Published in DiRROS: 09.07.2025; Views: 535; Downloads: 279
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1659. Ekosistemske storitve in upravljanje Alp : orodja in namigi za učinkovito upravljanje z okoljem in teritorialni razvojAlice Labadini, Sebastian Candiago, Lukas Egarter Vigl, Thomas Marsoner, Erich Tasser, Stephanie Roilo, Claudia Romelli, Rachele Carloni, Caroline Pecher, Sigrid Hechensteiner, Tadej Kogovšek, Suzana Vurunić, Tina Klemenčič, Matej Simčič, Miha Naglič, Gregor Danev, Mateja Nose Marolt, Tjaša Vezovnik, Anže Japelj, 2018, professional monograph Keywords: ekosistemske storitve, komunikacija z javnostmi, upravljanje z okoljem, Alpe
Published in DiRROS: 09.07.2025; Views: 461; Downloads: 223
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1660. Yield of commercial garlic (Allium sativum L.) varieties at three locations in Slovenia over two growing seasonsLovro Sinkovič, Mojca Škof, Vladimir Meglič, Barbara Pipan, 2025, original scientific article Keywords: garlic variety, marketable yield, climate, experimental site, Slovenia, Growing seasons
Published in DiRROS: 09.07.2025; Views: 420; Downloads: 226
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