1111. Stabilnost gozdnih površin v Sloveniji kot kriterij krajinske pestrosti in obstojnostiJanez Pirnat, Andrej Kobler, 2014, izvirni znanstveni članek Povzetek: Stabilnost notranjega okolja gozdov je pomemben kazalec biotske pestrosti na krajinskem nivoju, ko se odločamo o tem, ali bi določene gozdove lahko izkrčili. Zaradi tega smo se odločili, da ocenimo stabilnost notranjega gozdnega okolja v Sloveniji med letoma 1975 in 2012, saj so nam na voljo primerljivo dovolj natančni podatki o gozdni maski za teh 38 let. Štiri vrste sprememb pokrovnosti z gozdom (stabilni negozd, krčitve, zaraščanje in stabilni gozd) pojasnjujemo z empiričnim modelom v obliki odločitvenega drevesa, ki upošteva nadmorsko višino, naklon terena, talni tip, oddaljenost vsake celice na rastrski karti od gozdnega roba v izhodiščnem letu, oddaljenost vsake celice na rastrski karti od najbližjega naselja v izhodišč- nem letu. Pojasnjevalne modele smo zgradili po metodi strojnega učenja (Quinlan, 1986) z orodjem See5 (www.rulequest. com). Natančnost izbranega modela je znašala 74,65 %. V letu 2012 so stabilni gozdovi, katerih površina se od leta 1975 ni spreminjala, pokrivali 53 % Slovenije. Izmed vseh spremenljivk najbolje pojasnjujeta spremembo rabe začetna oddaljenost od gozdnega roba in deloma naklon terena. Oddaljenost od naselij in nadmorska višina nimata opaznega vpliva.
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4488; Prenosov: 2097
 Celotno besedilo (768,21 KB) |
1112. Mortality and crown conditions on Quercus robur L. permanent plots - a 20-year overviewMatjaž Čater, 2014, izvirni znanstveni članek Povzetek: Pedunculate oak (Quercus robur L.) forests in Slovenia are experiencing widespread mortality. Changes in lowlands are reflected in decline of complete forest complexes, high mortality, uneven stand structure and associated forest regeneration problems. Prediction of the present-tree response in disturbed forest ecosystems may significantly contribute to better guideline policies for the silvicultural and forest management practice in the changing environment in both stressed and stabile forest ecosystems. Data from annual crown condition surveys in the 1995-2014 period from four permanent plots have been compared with parameters from hemispherical photo analysis and hydrometeorological data. Good agreement has been confirmed between crown defoliation and total openness; all parameters from the hemispherical photo analysis, which were corrected for winter period values, also indicated a better agreement. Mortality rate and crown defoliation correlated well with extreme drought events. Pattern of agreement among compared parameters was different for the Krakovski gozd and Dobrava plots on one hand and Cigonca and Hraščica plots on the other hand. Mortality is influenced by the average air temperatures much more than by precipitation and groundwater table oscillations
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4299; Prenosov: 2191
Celotno besedilo (1,08 MB) |
1113. Influence of meteorological conditions and crown defoliation on tree phenology in intensive forest monitoring plots in SloveniaUrša Vilhar, Mitja Skudnik, Mitja Ferlan, Primož Simončič, 2014, izvirni znanstveni članek Povzetek: Data from the forest monitoring programme in Slovenia were used to assess the relationship between tree phenology, crown defoliation and meteorological conditions in Fagus sylvatica, Quercus robur and Picea abies forests in the 2004-2013 period. We hypothesized a species-specific response of first leaf unfolding, general leaf colouring, the length of the growing season to crown defoliation, air temperature, precipitation and soil water. In accordance with the hypothesis, we found a high sensitivity of first leaf unfolding to air temperature and precipitation for all species, exhibiting contrasting responses. We observed strong sensitivity of beech defoliation to precipitation and soil water conditions. Oak crown defoliation and next-year phenology were correlated, with higher crown defoliation contributing to earlier leaf unfolding, later autumn leaf colouring and longer growing season of oak in next year. Correlation between crown defoliation and phenology was found neither for beech nor spruce.
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4368; Prenosov: 2332
Celotno besedilo (1,35 MB) |
1114. Consistency of stand density estimates and their variability in forest inventories in SloveniaDavid Hladnik, Laura Žižek, 2014, izvirni znanstveni članek Povzetek: The national estimates of forest resources in Slovenia are based on data aggregation from forest inventories conducted in forest management units of Slovenia Forest Service (SFS) and on the parallel forest inventory established within the Forest and Forest Ecosystem Condition Survey (FECS) as a continuation of international forest monitoring programme. Since the difference in sampling design and temporal dynamics of data collection is of key importance for inventories at the level of forest management units compared to large-area forest inventories, the consistency of stand densities was checked in both concepts. Comparing growing stock estimates in FECS on the systematic 4-km grid of sampling plots from SFS forest management planning, no overall significant differences in temporally comparable periods have been detected. We propose a basis enabling consistent estimates of structural forest characteristics at the national level for the process of forest inventory harmonization in Slovenia.
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4486; Prenosov: 2448
Celotno besedilo (920,10 KB) |
1115. Makro EWVA - učinkovito orodje za analizo prevodnih elementov ranega lesa venčastoporoznih listavcevJernej Jevšenak, Tom Levanič, 2014, izvirni znanstveni članek Povzetek: V članku je predstavljena uporabnost programa ImageJ v lesni anatomiji. Njegova glavna prednost sta prosta dostopnost ter možnost vključevanja dodatnih vtičnikov in makrov. Program ImageJ smo uporabili kot platformo za razvoj makra EWVA za avtomatizirano prepoznavanje ranega lesa ter hitro in učinkovito analizo trahej venčastoporoznih listavcev. Uporabnost makra EWVA predstavljamo na primeru dveh dobov iz sestoja v Mlačah. V zaključku razpravljamo o prednostih in slabostih uporabljene metode.
Ključne besede: lesna anatomija, Quercus robur, traheje ranega lesa, prevodni elementi, ImageJ, makro, EWVA, Slovenija
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4589; Prenosov: 2186
Celotno besedilo (1,40 MB) |
1116. The role of economics in forest planning and policy evaluation in SloveniaDonald G. Hodges, 2014, izvirni znanstveni članek Povzetek: This paper explores the current status of the forest sectors in Slovenia, identifies potential issues in the management and use of the forests, and discusses a means by which policy makers can identify opportunities to enhance the role played by forests and their related goods and services in Slovenia. Specifically, a framework is proposed to assess the relationships between the economic, social, and ecological aspects of Slovenia%s forests; effects of changes in economic conditions on forest demands and uses; economic impacts of ecological, social, and business conditions; effects of current or proposed policies; and opportunities for the sustainable economic development of wood-based and forest-dependent enterprises. Such a framework is critical for managing Slovenia's forests and forestry sector in such a manner to optimize the ecological and economic potential.
Objavljeno v DiRROS: 12.07.2017; Ogledov: 3649; Prenosov: 2350
Celotno besedilo (1,01 MB) |
1117. Pomen in vplivi vran, s poudarkom na sivi vrani (Corvus cornix), v (sub)urbanem okoljuBoštjan Pokorny, Katarina Flajšman, Ida Jelenko Turinek, 2014, pregledni znanstveni članek Ključne besede: siva vrana, Corvus cornix, plenjenje gnezd, ekosistemska vloga
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4656; Prenosov: 2257
Celotno besedilo (762,49 KB) |
1118. |
1119. |
1120. |
