41. 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: 1622; Downloads: 963
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42. 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: 2129; Downloads: 574
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43. 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, final research report Keywords: gospodarjenje z gozdovi, smreka, Slovenija, smrekovi gozdovi
Published in DiRROS: 27.05.2020; Views: 1694; Downloads: 708
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44. 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, original scientific article Abstract: 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.
Keywords: rockfall, natural hazards, dendrogeomorphology, tree rings, stem scars, recurrence interval
Published in DiRROS: 01.04.2020; Views: 3956; Downloads: 3004
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45. Reconstruction of landslide activity using dendrogeomorphological analysis in the Karavanke mountains in NW SloveniaDomen Oven, Tom Levanič, Jernej Jež, Milan Kobal, 2019, original scientific article Abstract: Tree ring eccentricity was used to reconstruct landslide activity in the last 138 years in the Urbas landslide located at Potoška planina in the NW part of the Karavanke Mountains, Slovenia. The research was based on the dendrochronological sampling of Norway spruce (Picea abies (L.) Karst.) in areas of varying landslide intensity. Analysis of a sudden change in the eccentricity index of 82 curved trees concluded that there were 139 growth disturbances and 16 landslide reactivations between 1880 and 2015, with a landslide return period of 8.5 years. Using lidar data, changes in the surface of the digital terrain model (DTM) were compared with changes in the eccentricity index of trees at the same location in the period 2014-2017. On the basis of temporal changes in the eccentricity index and by using spatial interpolation, landslide activity was reconstructed for the period 1943%2015. During this period, landslide intensity increased in the central part of the landslide. Although categorization into seven categories of different stem curvature was proposed, no distinction between categories with respect to their eccentricity index was found.
Keywords: landslide activity, dendrogeomorphology, tree ring eccentricity, eccentricity index, digital terrain model, spatial interpolation
Published in DiRROS: 20.02.2020; Views: 1911; Downloads: 1360
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46. Belowground biodiversity relates positively to ecosystem services of European forestsMark Bakker, Ivano Brunner, Francis Ashwood, Brynhildur Bjarnadottir, Tom Bolger, Isabella Børja, Monique Carnol, Pavel Cudlin, Lise Dalsgaard, Amandine Erktan, Hojka Kraigher, Tanja Mrak, 2019, original scientific article Keywords: cultural services, provisioning services, regulating services, supporting services, belowground biodiversity, European forests
Published in DiRROS: 20.02.2020; Views: 1827; Downloads: 1322
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47. Low growth resilience to drought is related to future mortality risk in treesLucía De Soto, Maxime Cailleret, Frank Sterck, Steven Jansen, Koen Kramer, Elisabeth M.R. Robert, Tuomas Aakala, Mariano M. Amoroso, Christof Bigler, Jesus Julio Camarero, Katarina Čufar, Tom Levanič, 2020, original scientific article Abstract: Severe droughts have the potential to reduce forest productivity and trigger tree mortality. Most trees face several drought events during their life and therefore resilience to dry conditions might be crucial to long-term survival. We assess how growth resilience to severe droughts, including its components resistance and recovery, is related to the ability to survive future droughts by using a tree-ring database of surviving and now-dead trees from 118 sites (22 species, >3,500 trees). We find that, across the variety of regions and species sampled, trees that died during water shortages were less resilient to previous non-lethal droughts, relative to coexisting surviving trees of the same species. In angiosperms, drought-related mortality risk is associated with lower resistance (low capacity to reduce impact of the initial drought), while it is related to reduced recovery (low capacity to attain pre-drought growth rates) in gymnosperms. The different resilience strategies in these two taxonomic groups open new avenues to improve our understanding and prediction of drought-induced mortality. Resilience to drought is crucial for tree survival under climate change. Here, DeSoto et al. show that trees that died during drought were less resilient to previous dry events compared to surviving conspecifics, but the resilience strategies differ between angiosperms and gymnosperms.
Keywords: trees, mortality, gymnosperms, angiosperms, drought, resilience, resistance, recovery
Published in DiRROS: 20.02.2020; Views: 1738; Downloads: 1097
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48. Measuring techniques for concentration and stable isotopologues of CO2 in a terrestrial ecosystem : a reviewGrega E. Voglar, Saša Zavadlav, Tom Levanič, Mitja Ferlan, 2019, review article Abstract: Measurements of carbon dioxide and their stable isotopes are propulsive research tool in ecology and environmental science as they can give us insight into carbon cycle. They are widely used to investigate both natural and anthropogenic carbon sources in the atmosphere, hydrosphere and geosphere, as well as the exchange between these reservoirs. In this paper, we provide a basic overview of two different analytical measurement techniques, isotope ratio mass spectrometry (IRMS) and laser-absorption spectroscopy (LAS) which have been developed and utilized for monitoring of CO2 isotopologues in ecosystem. We present the basics for each technique, however with the emphasis on LAS measurement technique we are targeting readers who are not familiar with this topic. A major objective of this paper is to illustrate the current value and future potential of various analytical instruments in a wide range of applications deployed in the terrestrial ecosystem. Finally, we draw a conclusion from recent research campaigns by presenting a decision tree to better understand and choose a correct application combination for a selected scale of ecosystem.
Keywords: Isotope ratio mass spectrometry, laser-absorption spectroscopy, CO2 isotopologues, terrestrial ecosystem, decision tree, spectroscopic databases
Published in DiRROS: 18.02.2020; Views: 1759; Downloads: 782
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49. Beech and silver fir's response along the Balkan's latitudinal gradientMatjaž Čater, Tom Levanič, 2019, original scientific article Abstract: At the 1000km geographical distance in Dinaric montane forests of silver fir (Abies alba Mill.) and European beech (Fagus sylvatica L.), the tree response from the north-western sites towards southern, warmer and dryer sites was performed during three consecutive growing seasons (2011, 2012 and 2013). On eleven permanent plots, positioned in uneven-aged beech and fir forests above 800m along the geographical gradient, the physiological and morphological response to light intensity were measured in predefined light categories based on the analysis of hemispherical photos. Radial growth was analysed on all plots and compared to precipitation, temperature and two drought indexes. Analysis showed a decrease in the cumulative precipitation and no change in temperature between plots. Beech was most efficient in the open area light conditions, while fir proved most efficient under shelter. Physiological response for beech increased towards SE and reached its maximal values in the middle of transect, while fir%s response decreased from the NW towards SE. Tendency to plagiotropic growth decreased from NW to SE in both species. Growth response to climatic parameters is weak, stronger in fir than in beech and decreasing towards SE.
Keywords: beech, uneven aged forests, silviculture, latitudinal gradient, response, silver fir
Published in DiRROS: 13.11.2019; Views: 2080; Downloads: 1375
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50. Seasonal radial growth of Black pine (Pinus nigra Arnold) from Bosnia and Herzegovina, monitored by the pinning method and manual band dendrometersSimon Poljanšek, Jernej Jevšenak, Jožica Gričar, Tom Levanič, 2019, original scientific article Abstract: Despite numerous dendroclimatological investigations into different tree species from Bosnia and Herzegovina, information is lacking on intra-annual wood formation patterns, which would help us to interpret the climate signal in tree rings better. Using the pinning method and manual band dendrometers, we investigated the seasonal dynamics of radial growth of black pine (Pinus nigra Arnold) trees in two successive growing seasons: 2011 and 2012. The up to 60-year-old trees grew in a stand at the base of a hill in the western, mountainous part of the Balkan Peninsula. The seasonal dynamics of wood formation and final number of cells differed between the studied years. Wood formation started in both years in early to mid-March. Differences were noticed in the wood production culmination; in 2011 it occurred at the end of May and beginning of June in 2012 and 2011, respectively. Xylem growth finished in 2012 in the middle of August and in 2011 in the middle of September. Based on the first derivative of the Gompertz function calculated rate of xylem growth was lowest in 2011. The dendrometers recorded a slow increment rate in spring, higher in summer and a decreasing rate again in the late summer in both growing seasons. In comparison with pinning, dendrometers showed a delay in the start of radial growth of up to 20 days in 2012. Additionally, dendrometers showed an increase in stem girth after the end of both growing seasons, when wood formation was already completed. Deviations between the two methods could be ascribed to the influence of water storage dynamics in the main stem and numerous structural processes in bark tissue, which are captured in dendrometer data. The influence of weather conditions on xylem phenology is also indicated by differences between the two studied years, although it is difficult to identify the influence of particular short-term weather events.
Keywords: pinning, manual dendrometers, radial growth, Pinus nigra, cambium, Balkan Peninsula
Published in DiRROS: 11.09.2019; Views: 4720; Downloads: 3868
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