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233. Growth response of different tree species (oaks, beech and pine) from SE Europe to precipitation over timeDejan Stojanović, Tom Levanič, Bratislav Matović, Stefan Stjepanović, Saša Orlović, original scientific article Abstract: Changing climatic conditions can have various consequences for forest ecosystems, from increasing frequencies of forest fires, ice and windstorm events to pathogen outbreaks and mass mortalities. The Standardized Precipitation Index (SPI) was chosen for the evaluation of drought impact on the radial growth of trees after extensive preliminary testing of various calculated monthly climate parameters from the CARPATCLIM database. SPI was calculated for periods between 3 and 36 months for different sites (lowland and mountainous parts of Serbia, Southeast Europe), from which Quercus robur, Q. cerris, Fagus sylvatica and Pinus sylvestris samples were acquired. Bootstrapped Pearson%s correlations between SPI monthly indices and radial growth of tree species were calculated. We found that 12-month SPI for summer months may be a good predictor of positive and negative growth of different species at different sites. The strongest positive correlations for five of six tree-ring width chronologies were between 12-month June and 14-month September SPI, which implies that high growth rates can be expected when the autumn of the previous year, and winter, spring and summer of the current year, are well supplied with precipitation, and vice versa (low precipitation in given period/low growth rates).
Keywords: standardized precipitation index, SPI, climate change, tree mortality, Quercus sp., Fagus sylvatica, Pinus sylvestris
Published in DiRROS: 18.04.2018; Views: 2963; Downloads: 1693
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234. Dvojnozobi smrekov lubadar (Ips duplicatus)Maarten De Groot, 2018, professional article Keywords: poškodbe in varstvo gozdov, smrekov lubadar, Ips duplicatus, smreke, Picea spp., iglavci, bori, Pinus spp., macesni, Larix spp.
Published in DiRROS: 07.03.2018; Views: 3219; Downloads: 754
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235. Mali sesalci (Mammalia : Rodentia, Insectivora) v monokulturah črnega bora na slovenskem krasuMaja Jurc, Boris Kryštufek, 1991, original scientific article Keywords: Kras, črni bor, sesalci, zoologija, Mammalia, Pinus nigra, pomlajevanje, Apodemus flavicollis, redukcija semena, biotski dejavniki, monokultura, Slovenija
Published in DiRROS: 12.07.2017; Views: 4532; Downloads: 1910
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240. Metoda preučevanja sledi iglic terminalnega poganjkaSimon Poljanšek, Primož Oven, Risto Jalkanen, Tom Levanič, 2011, review article Abstract: Metoda preučevanja sledi iglic terminalnega poganjka, ali krajše metoda sledi iglic (ang.: needle trace method), retrospektivno beleži starost iglice v trenutku, ko odpade, ter preučuje vpliv okoljskih in biotskih dejavnikov na številne izpeljane podatke, ki temeljijo na ugotovljeni življenjski dobi iglice. Z izvedbo metode pridobimo podatke o dolžini višinskih prirastkov ter številu sledi iglic v posameznih branikah vseh višinskih prirastkov. Z izračunanimi kazalniki je mogoče oceniti fizično stanje krošnje preučevanega drevesa. Metoda je bila razvita na Finskem na rdečem boru (Pinus sylvestris L.), kmalu pa uporabljena tudi na drugih iglavcih. Uporablja se na področju dendrokronologije, gozdne ekologije, patologije in entomologije. V članku avtorji predstavljajo osnovno morfologijo sledi iglic, osnovno idejo metode in njeno uporabnost v okoljskih študijah ter izpeljane kazalnike, kot so relativno število sledi iglic ter zadrževanje, izguba, odmet, starost, dolgoživost, gostota, letni prirast števila in zaloga iglic.
Keywords: iglavci, iglice, rdeči bor, Pinus spp., listni aparat, kazalniki, okolje, onesnaževanje, defioliacija
Published in DiRROS: 12.07.2017; Views: 4657; Downloads: 2074
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