31. Can we use dendrogeomorphology for the spatial and temporal analysis of less intensive mass movement processes?: Acase study of three debris flows in NW and W SloveniaMatevž Konjar, Tom Levanič, Thomas Andrew Nagel, Milan Kobal, 2021, original scientific article Abstract: Debris flows can transport large amounts of material and therefore present a significant threat to infrastructure and human life. In this research, we used tree-ring width analyses to quantify the response of trees to three debris flow events in NW Slovenia (Javoršček, Srpenica) and W Slovenia (Nikova) for which we know the time of origin. We attempted to date these and similar tree responses in the past and compared the patterns between different tree species. Altogether, we sampled 147 trees across a range of tree species (Fagus sylvatica, Pinus sylvestris, Fraxinus excelsior, Fraxinus ornus, Acer pseudoplatanus, Picea abies, Juglans regia, Acer campestre, Tilia cordata and Ostrya carpinifolia), including reference trees that were outside the debris flow fan. For 91 trees, we constructed tree-ring chronologies and used pointer-year analysis to identify years that had abnormal growth. For the remaining trees (mostly Ostrya carpinifolia, Tilia cordata and Acer pseudoplatanus), we either could not accurately distinguish tree rings or two samples from a single tree showed significantly different growth patterns. The growth patterns of Fagus sylvatica and Picea abies following debris flow events showed a weak response at the Javoršček site and no clear responses at the other two sites. Tree species responded similarly at the same locations. Due to the lack of a clear response pattern, we were not able to reconstruct past debris flows. Keywords: debris flows, tree rings, dendrogeomorphology, slope processes Published in DiRROS: 30.03.2021; Views: 4250; Downloads: 2417 Full text (6,49 MB) This document has many files! More... |
32. Go for Mura : upravljanje poplavnih gozdov v območjih Natura 2000 ob MuriŠpela Ambrožič Ergaver, Gregor Božič, Maarten De Groot, Andreja Ferreira, Tatjana Gregorc, Marjana Hönigsfeld Adamič, Anže Japelj, Andrej Kapla, Marko Kovač, Štefan Kovač, Lado Kutnar, Tom Levanič, Boštjan Mali, Aleksander Marinšek, Zdenka Mazej, Nikica Ogris, Špela Planinšek, Mitja Skudnik, Gabrijela Triglav Brežnik, Saša Vochl, Al Vrezec, 2017, professional monograph Abstract: Vsebina publikacije na kratko povzema izsledke projekta Go for Mura. Predstavljeni so poplavni in močvirni gozdovi ob Muri, njihov pomen ter različni vidiki omenjenih gozdov, ki so bili raziskani tekom projekta. Predstavljene so ostale aktivnosti projekta . Keywords: Natura 2000, gospodarjenje, poškodovanost gozdov, poplavni gozd, Slovenija Published in DiRROS: 18.01.2021; Views: 1765; Downloads: 534 Full text (2,27 MB) |
33. Interrelations of various tree vitality indicators and their reaction to climatic conditions on a European beech (Fagus sylvatica L.)Mladen Ognjenović, Tom Levanič, Nenad Potočić, Damir Ugarković, Krunoslav Indir, Ivan Seletković, 2020, original scientific article Abstract: Interrelations of various common beech vitality indicators (crown defoliation, foliar chemistry, radial growth) as well as their possible dependencies on climatic conditions were investigated over the course of 12 years in a mature and healthy beech stand. Our results confirm the importance of temperature variables for defoliation, as high temperatures during spring and summer months induce the increase of defoliation. The same negative influence was observed with high maximum temperatures and low precipitation during previous year summer months. Phosphorus, calcium and magnesium nutrition of beech trees suffers from high temperatures during current year summer and benefits from more precipitation. High temperatures in current year May positively influence beech radial growth, while a wide range of minimum temperatures during March and June has a negative effect. In summary, high summer temperatures and low precipitation were shown to have a negative effect on all vitality indicators, and for defoliation and nutrition this effect can last into the following year. Keywords: defoliation, foliar nutrition, radial growth, drought, vitality Published in DiRROS: 15.01.2021; Views: 1242; Downloads: 390 Link to file |
34. Namestitev zvočnih in svetlobnih (modrih) odvračal za divjad na odsekih državnih cest v letih 2018-2020 : poročilo monitoringa za sklopa 1 in 2Samar Al Sayegh-Petkovšek, Urška Kunej, Ajša Alagić, Katarina Flajšman, Tom Levanič, Boštjan Pokorny, 2020, treatise, preliminary study, study Keywords: monitoring, trki vozil z divjadjo, omilitveni ukrepi, zvočne odvračalne naprave, svetlobni odsevniki, prostoživeči parkljarji, srnjad, jelenjad, divji prašič Published in DiRROS: 14.01.2021; Views: 1519; Downloads: 405 This document has many files! More... |
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36. Growth-limiting factors and climate response variability in Norway spruce (Picea abies L.) along an elevation and precipitation gradients in SloveniaJernej Jevšenak, Ivan Tychkov, Jožica Gričar, Tom Levanič, Jan Tumajer, Peter Prislan, Domen Arnič, Margarita Popkova, Vladimir V. Shishov, 2020, original scientific article Abstract: Norway spruce (Picea abies L.) is among the most sensitive coniferous species to ongoing climate change. However, previous studies on its growth response to increasing temperatures have yielded contrasting results (from stimulation to suppression), suggesting highly site-specific responses. Here, we present the first study that applies two independent approaches, i.e. the nonlinear, process-based Vaganov-Shashkin (VS) model and linear daily response functions. Data were collected at twelve sites in Slovenia differing in climate regimes and ranging elevation between 170 and 1300 m a.s.l. VS model results revealed that drier Norway spruce sites at lower elevations are mostly moisture limited, while moist high-elevation sites are generally more temperature limited. Daily response functions match well the pattern of growth-limiting factors from the VS model and further explain the effect of climate on radial growth: prevailing growth-limiting factors correspond to the climate variable with higher correlations. Radial growth correlates negatively with rising summer temperature and positively with higher spring precipitation. The opposite response was observed for the wettest site at the highest elevation, which positively reacts to increased summer temperature and will most likely benefit from a warming climate. For all other sites, the future radial growth of Norway spruce largely depends on the balance between spring precipitation and summer temperature. Keywords: Vaganov-Shashkin model, climate-growth correlations, tree rings, process-based modelling, dendroTools, dendroclimatology Published in DiRROS: 21.10.2020; Views: 1363; Downloads: 1104 Full text (1,94 MB) This document has many files! More... |
37. Isotopic and water relation responses to ozone and water stress in seedlings of three oak species with different adaptation strategiesClaudia Cocozza, Elena Paoletti, Tanja Mrak, Saša Zavadlav, Tom Levanič, Hojka Kraigher, Alessio Giovannelli, Yasutomo Hoshika, 2020, original scientific article Abstract: The impact of global changes on forest ecosystem processes is based on the species-specific responses of trees to the combined effect of multiple stressors and the capacity of each species to acclimate and cope with the environment modification. Combined environmental constraints can severely affect plant and ecological processes involved in plant functionality. This study provides novel insights into the impact of a simultaneous pairing of abiotic stresses (i.e., water and ozone (O3) stress) on the responses of oak species. Water stress (using 40 and 100% of soil water content at field capacity - WS and WW treatments, respectively) and O3 exposure (1.0, 1.2, and 1.4 times the ambient concentration - AA, 1.2AA, and 1.4AA, respectively) were carried out on Quercus robur L., Quercus ilex L., and Quercus pubescens Willd. seedlings, to study physiological traits (1. isotope signature [delta 13C, delta 18O and delta 15N], 2. water relation [leaf water potential, leaf water content], 3. leaf gas exchange [light-saturated net photosynthesis, Asat, and stomatal conductance, gs]) for adaptation strategies in a Free-Air Controlled Exposure (FACE) experiment. Ozone decreased Asat in Q. robur and Q. pubescens while water stress decreased it in all three oak species. Ozone did not affect delta 13C, whereas delta 18O was influenced by O3 especially in Q. robur. This may reflect a reduction of gs with the concomitant reduction in photosynthetic capacity. However, the effect of elevated O3 on leaf gas exchange as indicated by the combined analysis of stable isotopes was much lower than that of water stress. Water stress was detectable by delta 13C and by delta 18O in all three oak species, while delta 15N did not define plant response to stress conditions in any species. The delta 13C signal was correlated to leaf water content (LWC) in Q. robur and Q. ilex, showing isohydric and anisohydric strategy, respectively, at increasing stress intensity (low value of LWC). No interactive effect of water stress and O3 exposure on the isotopic responses was found, suggesting no cross-protection on seasonal carbon assimilation independently on the species adaptation strategy. Keywords: ozone, gas exchange, English oak, holm oak, downy oak, Quercus ilex L., Quercus robur L., Quercus pubescens Willd Published in DiRROS: 11.08.2020; Views: 1954; Downloads: 1176 Link to full text This document has many files! More... |
38. Poročilo o spremljanju stanja gozdov za leto 2018 : vsebinsko poročilo o spremljanju stanja gozdov v l. 2018 v skladu s Pravilnikom o varstvu gozdov (2009)Mitja Ferlan, Andrej Grah, Tom Levanič, Nikica Ogris, Špela Planinšek, Matej Rupel, Primož Simončič, Iztok Sinjur, Mitja Skudnik, Daniel Žlindra, 2019, final research report Keywords: varstvo gozdov, monitoring, stanje gozdov, zdravstveno stanje krošenj, popis povzročiteljev poškodb, meteorološke meritve, osutost dreves, poročila, Slovenija Published in DiRROS: 04.08.2020; Views: 2543; Downloads: 1003 Full text (4,60 MB) This document has many files! More... |
39. Revno rastišče in navadno ohmelje (Loranthus europaeus) je prizadelo graden na Dularjevem bregu pri Zidanem mostuNikica Ogris, Tine Hauptman, Tom Levanič, Dušan Jurc, Barbara Slabanja, Boštjan Pihler, 2010, professional article Keywords: suša, stres, navadno ohmelje, Loranthus europaeus, Quercus petraea, bolezni drevja, gozdovi, varstvo gozdov Published in DiRROS: 29.07.2020; Views: 1827; Downloads: 1053 Link to full text This document has many files! More... |
40. 30 let spremljanja stanja gozdov v SlovenijiGregor Božič, Matjaž Čater, Mitja Ferlan, Maarten De Groot, Tine Hauptman, Domen Finžgar, Katarina Flajšman, Anže Japelj, Dušan Jurc, Milan Kobal, Marko Kovač, Hojka Kraigher, Lado Kutnar, Tom Levanič, Aleksander Marinšek, Nikica Ogris, Matej Rupel, Primož Simončič, Iztok Sinjur, Mitja Skudnik, Mihej Urbančič, Andrej Verlič, Urša Vilhar, Saša Vochl, Marjana Westergren, Daniel Žlindra, 2015, scientific monograph Keywords: gozdarstvo, monitoring gozdov, zborniki, Slovenija Published in DiRROS: 05.06.2020; Views: 2375; Downloads: 637 Full text (3,81 MB) |