1. Zaključni dogodek projekta Forest EcoValue: gozdovi lokalnim skupnostim nudijo veliko več kot le lesTina Simončič, Matjaž Guček, Živa Bončina, Milan Kobal, Janez Logar, Andrej Arih, Marin Radovčić, 2026, professional article Keywords: lokalne skupnosti, ekosistemske storitve
Published in DiRROS: 20.04.2026; Views: 202; Downloads: 75
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2. Capacity building to support forest management in protective forests of SloveniaKristina Sever, Milan Kobal, Matjaž Guček, Andrej Breznikar, Aleš Poljanec, 2025, published scientific conference contribution abstract Keywords: protective forest, adaptive forest management, Forest Living Lab, natural hazard mitigation, marteloscope
Published in DiRROS: 01.10.2025; Views: 542; Downloads: 340
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3. Optimizing competitor definitions for the sustainable management of dominant silver fir trees (Abies alba Mill.) in uneven-aged mixed Dinaric forestsMilan Kobal, Tom Levanič, 2025, original scientific article Abstract: Understanding competition between trees is essential for sustainable forest management as interactions between trees in uneven-aged mixed forests play a key role in growth dynamics. This study investigated nine competition indices (CIs) for their suitability to model the effects of neighboring trees on silver fir (Abies alba) growth in Dinaric silver fir-European beech (Fagus sylvatica) forests. Although numerous competition indices have been developed, there is still limited consensus on their applicability in different forest types, especially in mature, structurally complex forest stands. The indices were evaluated using the adjusted coefficient of determination in a linear model wherein the volume growth of the last five years for 60 dominant silver fir trees was modeled as a function of tree volume and competition index. The results demonstrated that distance-dependent indices (e.g., the Hegyi height-distance competition and Rouvinen-Kuuluvainen diameter-distance competition indices), which consider the distance to competitors and their size, perform better than distance-independent indices. Using the optimization procedure in calculating the competition indices, only neighboring trees at a distance of up to 26-fold the diameter at breast height (DBH) of the selected tree (optimal search radius) and with a DBH of at least 20% of that of the target tree (optimal DBH) were considered competitors. Therefore, competition significantly influences the growth of dominant silver firs even in older age classes. The model based solely on tree volume explained 32.5% of the variability in volume growth, while the model that accounted for competition explained 64%. Optimizing the optimal search radius had a greater impact on model performance than optimizing the DBH threshold. This emphasizes the importance of balancing stand density and competition in silvicultural practice.
Keywords: sustainable forest management, Dinaric silver fir-European beech forests, Competition indices, CIs, optimal search distance, optimal diameter at breast height, DBH
Published in DiRROS: 05.06.2025; Views: 858; Downloads: 579
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4. Izobraževanje o urejanju hudourniških območij v gozdnem prostoruTina Simončič, Matjaž Guček, Aleš Poljanec, Milan Kobal, Jože Papež, Urša Vilhar, Erika Kozamernik, Jaša Saražin, 2025, professional article Keywords: urejanje hudournikov, gozdovi, hudourniki
Published in DiRROS: 03.06.2025; Views: 1033; Downloads: 404
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5. Using lidar data to analyse sinkhole characteristics relevant for understory vegetation under forest cover-case study of a high karst area in the Dinaric mountainsMilan Kobal, Irena Bertoncelj, Francesco Pirotti, Igor Dakskobler, Lado Kutnar, 2015, original scientific article Abstract: In this article, we investigate the potential for detection and characterization of sinkholes under dense forest cover by using airborne laser scanning data. Laser pulse returns from the ground provide important data for the estimation of digital elevation model (DEM), which can be used for further processing. The main objectives of this study were to map and determine the geomorphometric characteristics of a large number of sinkholes and to investigate the correlations between geomorphology and vegetation in areas with such characteristics. The selected study area has very low anthropogenic influences and is particularly suitable for studying undisturbed karst sinkholes. The information extracted from this study regarding the shapes and depths of sinkholes show significant directionality for both orientation of sinkholes and their distribution over the area. Furthermore, significant differences in vegetation diversity and composition occur inside and outside the sinkholes, which indicates their presence has important ecological impacts.
Keywords: sinkholes, geomorphology, vegetation
Published in DiRROS: 26.07.2024; Views: 1381; Downloads: 803
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6. Prostorska variabilnost sezonske količine padavin v Sloveniji v obdobju 2010–2019Milan Kobal, 2022, original scientific article Abstract: Prostorsko variabilnost količine padavin v Sloveniji smo ovrednotili z analizo razdalje razgradnje korelacije CDD (angl. Correlation Decay Distance), ki prikazuje spremembo korelacije v količini padavin med meteorološkimi postajami glede na njihovo medsebojno oddaljenost. Uporabili smo podatke tistih meteoroloških postaj (n = 160), ki so na isti lokaciji neprekinjeno beležile količino padavin vseh 120 mesecev (december 2009–november 2019). Za vsako meteorološko postajo smo po posameznih letnih časih izračunali mejno razdaljo, pri kateri je korelacija med količino padavin višja od 0,707 (r2 = 0,5). Rezultati kažejo, da se prostorska variabilnost količine padavin med letnimi časi razlikuje, in sicer je najvišja poleti (CDD = 50 km), sledi pomlad (CDD = 76 km) in jesen (CDD = 120 km) ter zima (CDD = 141 km), ko je prostorska variabilnost količine padavin najnižja. Prostorsko gledano je variabilnost količine padavin podobna spomladi in jeseni (najmanjša prostorska variabilnost padavin v V in JV Sloveniji), medtem ko je poleti najnižja v J Sloveniji, pozimi pa v SZ Sloveniji. Karta variogramov prikazuje anizotropijo v razdalji razgradnje korelacije za spomladanske padavine. Višje vrednosti semivariance so očitne v smeri SV-JZ, medtem ko so vrednosti semivariance v smeri JV-SZ precej nižje.
Keywords: padavine, razdalja razgradnje korelacije, prostorska variabilnost, Slovenija
Published in DiRROS: 28.06.2022; Views: 4127; Downloads: 1604
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7. Gozdnovegetacijska karta SlovenijeŽivko Košir, Marja Zorn-Pogorelc, Janko Kalan, Lojze Marinček, Ivan Smole, Lojze Čampa, Marjan Šolar, Boštjan Anko, Marko Accetto, Dušan Robič, Valentin Toman, Lojze Žgajnar, Niko Torelli, Irena Tavčar, Lado Kutnar, Anton Kralj, 2007, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: gozdnovegetacijska karta, digitalni zapis, elektronski medij, CD-Rom, fitocenološka karta, fitocenologija, zgodovina
Published in DiRROS: 22.06.2022; Views: 2945; Downloads: 5148
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8. Kako nastajajoči vodni kataster vpliva na določanje hidrološke funkcije gozda?Milan Kobal, Janez Pirnat, 2022, original scientific article Abstract: Sedanji sistem funkcij gozdov, ki ga v osnovi prinaša Zakon o gozdovih iz leta 1993, je potreben nadgradnje, saj je funkcij zelo veliko, njihove vsebine pa se pogosto podvajajo. Ob takratnem prvem kartiranju funkcij gozdov se je gozdarstvo opiralo predvsem na svoje lastne prostorske sloje, zdaj pa so na voljo podrobnejše prostorske zbirke tudi drugih uporabnikov prostora. Oboje je nov izziv za prikazovanje in vsebinsko vrednotenje ukrepov za zagotavljanje trajnosti funkcij gozdov ter prilagojenega gospodarjenja z gozdovi. V prispevku smo obravnavali hidrološko funkcijo gozda, deloma zaradi aktualnih razmer v Slovenij in svetu (poplave, suše), deloma pa zato, ker novejši podatki o vodnem katastru bistveno nadgrajujejo bazo podatkov o vodah. Če kot velikost orisa okrog površinskih voda upoštevamo eno drevesno višino, je to 120.688,64 ha gozdov, kjer bi bila po dosedanjih kriterijih lahko poudarjena hidrološka funkcija gozda. Daleč največ takih gozdov je ob vodotokih, sledijo izviri in mokrotne površine.
Keywords: sistem funkcij gozdov, hidrološka funkcija gozda, vodni kataster
Published in DiRROS: 08.03.2022; Views: 2478; Downloads: 720
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10. The influence of land use on the spatial distribution and intensity of heat islands in SloveniaAnica Simčič, Petra Pečan, Mojca Nastran, Milan Kobal, 2021, original scientific article Abstract: Heat islands (HI) are a common anthropogenic phenomenon and are defined as artificial surfaces (urban areas) that have a higher average temperature than their surroundings (rural areas). The aim of this work was to determine the influence of land use on the spatial distribution and intensity (HIi ) of HI in Slovenia. The MODIS Land Surface Temperature (LST) and Corine Land Cover (CLC) databases were used to perform the analysis. Within the identified HI, two HI levels were determined based on temperature difference. The results revealed a statistically significant negative correlation between HIi and both forest co%ver and forest fragmentation (forest edge density and ratio of mean forest patch size to HI size). Artificial surface was positively correlated with HIi . The results contribute to the understanding of the spatial distribution of HI and HIi and provide informati%on for spatial planning and policy-making to reduce the negative impact of HI.
Keywords: heat island, forest cover, artificial surface, forest fragmentation
Published in DiRROS: 17.08.2021; Views: 5314; Downloads: 3152
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