31. 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, izvirni znanstveni članek Povzetek: 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. Ključne besede: defoliation, foliar nutrition, radial growth, drought, vitality Objavljeno v DiRROS: 15.01.2021; Ogledov: 1172; Prenosov: 350 Povezava na datoteko |
32. 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, elaborat, predštudija, študija Ključne besede: monitoring, trki vozil z divjadjo, omilitveni ukrepi, zvočne odvračalne naprave, svetlobni odsevniki, prostoživeči parkljarji, srnjad, jelenjad, divji prašič Objavljeno v DiRROS: 14.01.2021; Ogledov: 1455; Prenosov: 405 Gradivo ima več datotek! Več... |
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34. 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, izvirni znanstveni članek Povzetek: 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. Ključne besede: Vaganov-Shashkin model, climate-growth correlations, tree rings, process-based modelling, dendroTools, dendroclimatology Objavljeno v DiRROS: 21.10.2020; Ogledov: 1300; Prenosov: 1036 Celotno besedilo (1,94 MB) Gradivo ima več datotek! Več... |
35. 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, izvirni znanstveni članek Povzetek: 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. Ključne besede: ozone, gas exchange, English oak, holm oak, downy oak, Quercus ilex L., Quercus robur L., Quercus pubescens Willd Objavljeno v DiRROS: 11.08.2020; Ogledov: 1865; Prenosov: 1129 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
36. 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, končno poročilo o rezultatih raziskav Ključne besede: varstvo gozdov, monitoring, stanje gozdov, zdravstveno stanje krošenj, popis povzročiteljev poškodb, meteorološke meritve, osutost dreves, poročila, Slovenija Objavljeno v DiRROS: 04.08.2020; Ogledov: 2381; Prenosov: 938 Celotno besedilo (4,60 MB) Gradivo ima več datotek! Več... |
37. 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, strokovni članek Ključne besede: suša, stres, navadno ohmelje, Loranthus europaeus, Quercus petraea, bolezni drevja, gozdovi, varstvo gozdov Objavljeno v DiRROS: 29.07.2020; Ogledov: 1722; Prenosov: 1006 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
38. 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, znanstvena monografija Ključne besede: gozdarstvo, monitoring gozdov, zborniki, Slovenija Objavljeno v DiRROS: 05.06.2020; Ogledov: 2254; Prenosov: 598 Celotno besedilo (3,81 MB) |
39. Obvladovanje tveganj pri gospodarjenju s smreko v gozdovih Slovenije : zaključno poročilo projekta V4-1614Tom Levanič, Lado Kutnar, Andrej Kobler, Aleksander Marinšek, Matjaž Čater, Gregor Božič, Marjana Westergren, Maarten De Groot, Jernej Jevšenak, Samo Stopar, 2020, končno poročilo o rezultatih raziskav Ključne besede: gospodarjenje z gozdovi, smreka, Slovenija, smrekovi gozdovi Objavljeno v DiRROS: 27.05.2020; Ogledov: 1778; Prenosov: 727 Celotno besedilo (11,73 MB) |
40. Reconstruction of rockfall activity through dendrogeomorphology and a scar-counting approach : a study in a beech forest stand in the Trenta valley (Slovenian Alps)Barbara Žabota, Daniel Trappmann, Tom Levanič, Milan Kobal, 2020, izvirni znanstveni članek Povzetek: Trees represent an important archive that can be used to reconstruct the spatial and temporal patterns of rockfall events. Rockfall impacts can be recorded in the form of anomalies in tree rings and impact scars on the tree stem. In this paper we demonstrate the use of an approach based on counting scars for reconstructing the frequency and spatial pattern of past rockfalls. The approach was applied by counting the visible scars on the stem surface of 52 European beech trees (Fagus sylvatica L.) in the area of the Trenta Valley, Slovenia. The average number of impacts per trees was 7, and the impacts were mostly classified as old, indicating reduced rockfall activity in recent years. The average recurrence interval was 31.8 years, which was reduced by 1.2 years by the application of the conditional impact probability. The spatial pattern of rockfall impacts shows that rockfall activity is higher in the middle part of the studied slope. Ključne besede: rockfall, natural hazards, dendrogeomorphology, tree rings, stem scars, recurrence interval Objavljeno v DiRROS: 01.04.2020; Ogledov: 4102; Prenosov: 3045 Celotno besedilo (1,02 MB) |