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32. Poročilo o spremljanju stanja gozdov za leto 2022 : vsebinsko poročilo o spremljanju stanja gozdov v skladu s Pravilnikom o varstvu gozdov (2009)Mitja Ferlan, Andrej Grah, Janez Kermavnar, Nike Krajnc, Lado Kutnar, Nikica Ogris, Anže Martin Pintar, Matej Rupel, Mitja Skudnik, Urša Vilhar, Daniel Žlindra, 2023, final research report Keywords: varstvo gozdov, monitoring, stanje gozdov, zdravstveno stanje krošenj, popis povzročiteljev poškodb, meteorološke meritve, osutost dreves, poročila, Slovenija
Published in DiRROS: 29.06.2023; Views: 411; Downloads: 434
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33. Analiza izbranih drevesnih modelov razvoja gozdov, primernih za modeliranje na velikoprostorski ravni, in možnosti njihove uporabe v SlovenijiJernej Jevšenak, Boštjan Mali, Mitja Skudnik, 2023, original scientific article Abstract: Prispevek obravnava drevesne modele razvoja gozdov, ki so pomembno orodje pri odločanju, upravljanju in strateških odločitvah na področju gospodarjenja z gozdovi. V Sloveniji smo šele v zadnjih letih pričeli s sistematičnim razvojem področja modeliranja gozdov, ki vključuje razvoj matričnega populacijskega modela, testiranje izbranih modelov iz tujine ter razvoj posameznih komponent modelov. Namen prispevka je predstaviti področje empiričnih drevesnih modelov za modeliranje razvoja gozdov na velikoprostorski ravni. Podrobneje predstavljamo uveljavljene metode za modeliranje posameznih komponent drevesnih modelov, kot so debelinska in višinska rast, razvoj krošnje, mortaliteta ter vrast in pomlajevanje. Opravili smo presojo primernosti izbranih drevesnih modelov z vidika možnost njihove uporabe v Sloveniji. Ugotavljamo, da imajo modeli SILVA, WEHAM, MASSIMO in CALDIS največje možnosti za uporabo v Sloveniji, saj so vsi primerni za različne gozdne tipe in mešane gozdove z raznomerno zgradbo, ki prevladujejo v Sloveniji. Poleg testiranja obstoječih modelov predlagamo razvoj novih modelov, prilagojenih raznomernim in mešanim sestojem v Sloveniji. Predlagamo tudi razširitev nabora kazalnikov pri gozdnih inventurah ter dodatne meritve značilnosti dreves, npr. lastnosti krošenj, ki bi razširile možnosti modeliranja razvoja gozdov v Sloveniji. V zaključkih razpravljamo tudi o možnosti uporabe strojnega učenja na področju modeliranja razvoja gozdov, saj bi tovrstni modeli lahko predstavljali naslednjo generacijo modelov.
Keywords: modeliranje, razvoj gozda, velikoprostorska gozdna inventura, stalne vzorčne ploskve, simulator razvoja gozdov, napovedovanje, gozdarska politika
Published in DiRROS: 27.06.2023; Views: 1177; Downloads: 573
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34. Causes and consequences of large-scale windthrow on the development of fir-beech forests in the Dinaric mountainsMatjaž Čater, Ajša Alagić, Mitja Ferlan, Jernej Jevšenak, Aleksander Marinšek, 2023, original scientific article Abstract: We investigated several aspects of windthrow that are relevant to our understanding and management of forest ecosystems. As an example, we used an extreme event in December 2017, when the strongest storm in recent history occurred in the Slovenian Dinaric High Karst. We examined influential factors such as soil properties, wind speed, precipitation and ecological consequences for the affected forests. Soil properties were measured around standing and fallen silver fir trees at all three research sites. Tree species composition in the regeneration was observed on plots with chemical and acoustic ungulate deterrents and on control plots without deterrents. Economic estimates of yield loss due to damage were calculated at the national level. A model of the potential threat from windthrow was also developed based on data collected from windthrow events and meteorological data over the past 20 years. Our results indicate that soil depth and mineral fraction depth were similar at sites with and without damaged trees and were not the determining factors for tree toppling. Plots with acoustic deterrents showed the most effective regeneration development, the least decline in silver fir and the greatest increase in noble hardwood seedlings, while plots with chemical deterrents showed the least browsing damage. The estimated economic loss of €16.1 million is 6.6% less than the harvest under normal conditions. The economic loss was relatively low due to the nature of the storm, with the predominant type of damage being uprooted trees with no damaged trunks. The windthrow hazard model revealed that a large number of consecutive events with strong winds in each section weakened the stand, which was subsequently knocked down during the next extreme wind and rainfall event.
Keywords: natural forest regeneration, windthrow, economic loss, browsing, ungulate deterrents, forest soil properties, potential threat model
Published in DiRROS: 27.06.2023; Views: 1124; Downloads: 525
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36. Evaluation of sediments from the river Drava and their potential for further use in the building sectorVilma Ducman, Karmen Fifer Bizjak, Barbara Likar, Mitja Kolar, Ana Robba, Jernej Imperl, Mojca Božič, Boštjan Gregorc, 2022, original scientific article Abstract: Sedimentation is a naturally occurring process of allowing particles in water bodies to settle out of the suspension under a gravity effect. In this study, the sediments of the Drava River were fully investigated to determine the heavy metal concentrations along the river and their potential reuse in the construction sector. Naturally dehydrated sediments from the Drava River were tested as an additive for the production of fired bricks. The dredged sediments were used as a substitute for natural brick clay in amounts up to 50% by weight, and it was confirmed that up to 20% by weight of the added sediment could be used directly in the process without critically affecting performance. Finally, the naturally dehydrated sediments were also evaluated for their use as a filling material in the construction of levees. The natural moisture content of the dehydrated sediment was too high for it to be used without additives, so quicklime was added as an inorganic binder. The test results showed an improvement in the geotechnical properties of the material to such an extent that it is suitable as a filling material for levees.
Keywords: sediment, pollution, clay industry, soil stabilization, open access
Published in DiRROS: 31.05.2023; Views: 299; Downloads: 157
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37. The association between day-to-day stress experiences, recovery, and work engagement among office workers in academia : an Ecological Momentary Assessment studyLarissa Bolliger, Ellen Baele, Elena Colman, Gillian Debra, Junoš Lukan, Mitja Luštrek, Dirk De Bacquer, Els Clays, 2023, original scientific article Abstract: Objectives. This study aimed to investigate the associations between day-to-day work-related stress exposures (i.e., job demands and lack of job control), job strain, and next-day work engagement among office workers in academic settings. Additionally, we assessed the influence of psychological detachment and relaxation on next-day work engagement and tested for interaction effects of these recovery variables on the relationship between work-related stressors and next-day work engagement. Methods. Office workers from two academic settings in Belgium and Slovenia were recruited. This study is based on an Ecological Momentary Assessment (EMA) with a 15-working day data collection period using our self-developed STRAW smartphone application. Participants were asked repeatedly about their work-related stressors, work engagement, and recovery experiences. Fixed-effect model testing using random intercepts was applied to investigate within- and between-participant levels. Results. Our sample consisted of 55 participants and 2710 item measurements were analysed. A significant positive association was found between job control and next-day work engagement (β = 0.28, p < 0.001). Further, a significant negative association was found between job strain and next-day work engagement (β = −0.32, p = 0.05). Furthermore, relaxation was negatively associated with work engagement (β = −0.08, p = 0.03). Conclusions. This study confirmed previous results, such as higher job control being associated with higher work engagement and higher job strain predicting lower work engagement. An interesting result was the association of higher relaxation after the working day with a lower next-day work engagement. Further research investigating fluctuations in work-related stressors, work engagement, and recovery experiences is required.
Keywords: work-related stress, stress exposure, work engagement, office workers, academia
Published in DiRROS: 04.05.2023; Views: 335; Downloads: 152
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38. Predstavitev portala Citizenscience.si in razprava o Mreži občanske znanosti v Sloveniji : spletna predstavitev, 26. 1. 2023Mitja Vovk Iskrić, Uroš Kunaver, Til Mlakar, 2023, professional film, videorecordings or sound recordings Keywords: občanska znanost, knjižnično informacijska dejavnost, Citizenscience.si, spletni portali, Mreža občanske znanosti
Published in DiRROS: 25.04.2023; Views: 348; Downloads: 92
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40. Modelling dominant tree heights of Fagus sylvatica L. using function-on-scalar regression based on forest inventory dataMarkus Engel, Tobias Mette, Wolfgang Falk, Werner Poschenrieder, Jonas Fridman, Mitja Skudnik, 2023, original scientific article Abstract: European beech (Fagus sylvatica L.) is an important tree species throughout Europe but shifts in its suitable habitats are expected in the future due to climate change. Finding provenances that are still economically viable and ecologically resilient is an ongoing field of research. We modelled the dominant tree heights of European beech as a trait reflecting growth performance dependent on provenance, climate and soil conditions. We derived dominant tree heights from national forest inventory (NFI) data from six European countries spanning over large ecological gradients. We performed function-on-scalar regression using hierarchical generalized additive models (HGAM) to model both the global effects shared among all provenances and the effects specific to a particular provenance. By comparing predictions for a reference period of 1981–2010 and 2071–2100 in a RCP 8.5 scenario, we showed that changes in growth performance can be expected in the future. Dominant tree heights decreased in Southern and Central Europe but increased in Northern Europe by more than 10 m. Changes in growth performance were always accompanied by a change in beech provenances, assuming assisted migration without dispersal limitations. Our results support the concept of assisted migration for the building of resilient future forests and emphasize the use of genetic data for future growth predictions.
Keywords: hierarchical GAMs, functional regression, Fagus sylvatica, provenance, assisted migration
Published in DiRROS: 21.03.2023; Views: 470; Downloads: 198
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