1. Reliefne značilnosti tal in objedanje mladja s strani velikih rastlinojedih parkljarjev v jelovo-bukovem gozduDušan Roženbergar, Robert Klevišar, Jurij Diaci, 2019 Povzetek: Veliki rastlinojedi parkljarji (VRP) različno vplivajo na razvoj gozdnih ekosistemov. Eden izmed najbolj negativnih vplivov, ki ga imajo na dolgoročni razvoj gozdov, je posledica kroničnega čezmernega objedanja mladja. Namen raziskave je bil s pomočjo analize objedanja v delu dinarskih jelovo-bukovih gozdov ugotoviti, kakšen vpliv na intenzivnost objedanja imajo habitatne značilnosti prostora in relief. Povprečna objedenost mladja je bila 70 %, analiza višinske strukture mladja pa je pokazala, da ni prehajanja gorskega javorja in jelke v zgornje višinske plasti. Potrdili smo vpliv stopnje kritja za VRP in reliefa na stopnjo objedenosti. Največ poškodb smo zabeležili na grebenih in v vrtačah. Glede na rezultate naših analiz v prihodnje v jelovobukovih gozdovih na območju naše raziskave ne bo mogoče zagotoviti primesi jelke in gorskega javorja v zgornjih sestojnih položajih. Če želimo v tem delu Slovenije vzgojiti pestre gozdove, bo poleg gozdno-gojitvenega ukrepanja nujno nadaljevanje intenzivnega gospodarjenja z VRP v smislu zmanjševanja njihovih gostot.
Ključne besede: objedanje, gojenje gozdov, veliki rastlinojedi parkljarji, relief, pomlajevanje, Abies alba, Fagus sylvatica, Acer pseudoplatanus
DiRROS - Objavljeno: 08.07.2019; Ogledov: 3485; Prenosov: 1888
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3. Nastanek lesa pri beli jelki (Abies Alba Mill.) in navadni bukvi (Fagus sylvatica L.) - diferenciacija terminalnih celic v ksilemski branikiJožica Gričar, Peter Prislan, Gerald Koch, Katarina Čufar, 2009 Ključne besede: bela jelka, Abies alba Mill., bukev, Fagus sylvatica L., nastanek lesa, diferenciacija, svetlobna mikroskopija, UV mikrospektrofotometrija
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2463; Prenosov: 771
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5. Prirastna depresija pri jelki v Dinarskem fitogeografskem območju med leti 1960 in 1995Tom Levanič, 1997 Povzetek: V Dinarskem fitogeografskem območju smo na 6 raziskovalnih objektih preučili pojav prirastne depresije pri jelki v obdobju 1960-1995. Vzorčili smo v transektih dolžine 400-600 m. Skupaj smo analizirali 365 jelk različnih stopenj prizadetosti. Ugotovili smo, da se je prirastna depresija začela leta 1960 in da je prirastek upadal do leta 1986, nato pa se je začel povečevati. Povečevanje širine branike in pozitiven odziv jelke na izboljšanje rastnih pogojev sta močno odvisna od rastnosti dreves. Tako so se na izboljšanje najbolj odzvale navidezno neprizadete jelke, medtem ko pri prizadetih jelkah izrazitega izboljšanja ni. Pri močno prizadetih jelkah pa se propadanje nadaljuje. Izkazalo se je, da so najbolj prizadeti tisti objekti, ki ležijo bliže urbanih središč in manj tisti, ki so od njih bolj oddaljeni
Ključne besede: jelka, Abies alba, dendrokronologija, Slovenija, propadanje gozda, onesnaževanje
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2672; Prenosov: 929
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6. The chronology of the silver fir (Abies alba Mill.) from Pohorje, SloveniaTom Levanič, Katarina Čufar, 1998 Povzetek: Dendrochronological investigations were made in silver fir (Abies alba Mill.) from Lovrenc, Pohorje, in the NE Slovenia. Tree ring analyses were made in discs of 25 healthy, adult, dominant or co-dominant silver firs and in cores from roof construction of two older rustic buildings from the same region using a LINTAB measuring device nad a TSAP/X of F. Rinn. We constructed the chronology of trees spanning the period of 1785-1996. The chronology of the old house is spanning the period of 1713-1852 and the chronology of barn 1745-1887. It was shown that the last considerable reconstruction of the house roof took place after the end of the growing period of 1952. The dating of the cores containining the outer ring 1887 confirmed the dating based on the carved inscription "1888". The three chronologies were joined into 284 years long silver fir chronology for Pohorje spanning the period of 1713-1996. It was compared with the Slovene silver fir chronology of the Dinaric region. Despite distance and great differences between the two regions there was shown a statistically confirmed similarity of two chronologies with tBP=9.8, GLK=71% and CDI=398. The chronologies have 21 common negative, 21 positive signature years and one common signature interval. Based on this the constructed chronology may be considered as representative for the whole Pohorje. The two chronologies are expected to be a good base to construct a regional Slovene Silver-fir chronology for dating in whole Slovenia. Two Slovene chronologies were compared with the following European silver fir chronologies: South German, stand 1993 (Becker and Siebenlist 1970; Spurk and Friedrich , pers. com.), Bavarian Forest - Germany (Eckstein, Sass 1988), Abetone - Italy (Schweingruber, ITRDB), Bannwald - Switzerland (Schweingruber, ITRDB). Both Slovene chronologies proved to be statistically similar with the two German and the Italian silver fir chronology, but showed no similarity with the Swiss one. The Pohorje chronology correlates better with both German ones and the Dinaric chronology correlates better with the Italian one.
Ključne besede: jelka, Abies alba, datiranje objektov, dendrokronologija, Silver fir, Abies alba, dating of the object, dendrochronology, Slovenia
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2729; Prenosov: 1012
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7. Krčenje in nabrekanje ter dimenzijska stabilnost juvenilnega in adultnega lesa smreke in jelkeŽeljko Gorišek, Milan Klinc, 1997 Ključne besede: jelovina, Abies alba Mill., smrekovina, Picea abies Karst., adultni les, juvenilni les, gostota, krčenje, nabrekanje, dimenzijska stabilnost
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2853; Prenosov: 947
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9. Light response of Fagus sylvatica L. and Abies alba Mill. in different categories of forest edge - vertical abundance in two silvicultural systemsMatjaž Čater, Andrej Kobler, 2017 Povzetek: In managed Dinaric montane fir (Abies alba Mill.) and European beech (Fagus sylvatica L.) forests, the light response of young beech and fir in gap microsites was studied during three consecutive growing periods (2009, 2010, and 2011) under controlled environmental conditions in stands of single-tree and irregular shelterwood silvicultural system. According to maximal quantum yield, the different response between species in microsite light categories was evidenced for silver fir on microsites with predominating diffuse light and for beech on microsites with predominating direct light, respectively. Abundance and change of share in microsite light categories was compared over different elevation belts on comparable sites between two silvicultural systems. The share of forest edge area was bigger in the irregular shelterwood system. Change in width of forest edge (20, 30 and 40 m) did not affect the proportion and share of the microsite in both regions of different silvicultural system. Separation of microsite areas between both silvicultural systems, evident in lower elevation belts was not evident in the most conflict and highest elevation zone, while the absolute values of all categories above 700 m in both systems were almost identical, indicating the same, small-scale irregular shelterwood system, known also as the freestyle silvicultural approach.
Ključne besede: Fagus sylvatica, Abies alba, Dinaric silver fir and beech forests, Dinaric forests, forest edge, silviculture, selective system, irregular shelterwood system
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2292; Prenosov: 745
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10. Differentiation of last formed tracheids in wood of silver firs (Abies alba) having various cambial productivityJožica Gričar, Aleš Straže, Katarina Čufar, 2003 Povzetek: To examine the state of differentiation of the last tracheids formed in wood and the duration of cambial activity, samples of wood and cambium were taken from mature silver fir (Abies alba) trees having various cambial productivity.Semi-thin cross-sections of wood sampled in July and October, 1999, were stained with toluidine blue and observed under a light microscope. In July, three different phases of current annual xylem growth ring formation were found, as a result of various cambial tree productivity. In October, the cell divisions in the cambium were completed in all investigated trees, while the process of differentiation was not entirely completed in trees with a more productive cambium. The number of undifferentiated tracheids was higher in trees having a more productive cambium. In these trees, the cambial activity and the differentiation ended later. In declining trees, the number of cells produced by the cambium was lower and the duration of cambial activity was shorter.
Ključne besede: navadna jelka, Abies alba, les, traheide, kambijeva aktivnost, diferenciacija, wood, silver fir, tracheids, cambial activity, differentiation
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2631; Prenosov: 997
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