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Povzetek: Types of ectomycorrhizae were studied in soil cores from a young regeneration center in an autochthonous Norway spruce stand on Pokljuka (Triglav National Park, 1200 m.a.s.l.). Soil cores of equal volume (274 ml, 0 - 18 cm deep) weretaken from 33 sampling plots. In the samples all the roots were counted and types of ectomycorrhizae briefly characterized. From these data diversity indices (species diversity (d) and Shannon- Weaver index of diversity (H)) were calculated. Interactions among mycorrhizae, light regime and survival of spruce seedlings were studied. Out of about 50,000 root tips approximately 1 %were non-mycorrhizal, 63 % were old unviable mycorrhizae and 36 % were identifiable ectomycorrhizal root tips, forming 27 different types of ectomycorrhizae. Sixteen types of ectomycorrhizae were briefly characterized. The Shannon diversity index for types of ectomycorrhizae was high (3.13) with respect to the above-ground diversity of vegetation (1.7). The direct site factor was shown to be negatively correlated to ~Piceirhiza cornuta. The diffuse site factor was negatively correlated to Cortinarius sp. (obtusus type) and positively correlated to Inocybe sp. The ground vegetation cover waspositively correlated to Piceirhiza gelatinosa and the total vegetation cover to Elaphomyces sp.
Ključne besede: ectomycorrhizae, types of ectomycorrhizae, Norway spruce, natural regeneration, Pokljuka
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4328; Prenosov: 1867
Celotno besedilo (1,79 MB)

Povzetek: Social context as more or less neglected field of sustainable development is crucial for the implementation of forest management measures. We can consider it as a basis to cope with (changing) structure characteristics. Realisation of public services, which we face when coping with economic crisis, might take this into consideration. The Forest Service network serves as a scanner of needs in their social context. It is also a respondent to local specifics in the form of forest management measures. Evidence of research on the social research in Slovenian forestry is weak, although not non-existent. We tested asystem approach, a structuring method of general public. Segmentation, a method presented, is generally known in marketing and has not been used in Slovenian forestry up to now. The two-step clustering analysis of quantitative data gathered with an inquiry of study circles (form of community learning) was used and is described herewith. The results show three general value based segments of study circle participants. The role of Slovenian foresty is changing and is not independent of its dynamic and colourful social contexts, Recognition of the society structure and dynamics may contribute to the rationalisation of organisational models during the crisis period. Hoewer, grounded actualisation of recent organisational models is possible only by considering priorities of the society's segments. We conclude with suggestion for more R&D engagement in the social pillar of multifunctional forest management, in particular as the Slovenian social context is defined by dominance of private property and forest owners' ageing, which are far from being analysed and responded to.
Ključne besede: forestry, sustainable development, structure of society, segmentation, information flow, knowledge flow
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4738; Prenosov: 1968
Celotno besedilo (309,11 KB)

Povzetek: Članek predstavlja raziskavo zaraščanja kraške krajine. Pri analizi smo uporabili tehnike daljinskega zaznavanja, multitemporalne analize satelitskih slik v GIS okolju in statistične regresijske modele. Gozdnatost se je od leta 1935 povečala od 50,4% na 67,9%. Z regresijskim modelom smo pojasnili 71% celotne variabilnosti. Dejavniki, ki so največ prispevali k pojasnitvi zaraščanja so: nadmorska višina, razdalja do gozdnega roba, delež zaraslih površin v predhodnem obdobju, delež kmetijskih zemljišč in dve variabili, ki opisujeta intenzivnost kmetijske rabe. Če se procesi zaraščanja ne bodo bistveno spremenili, lahko do leta 2020 pričakujemo nadaljnje povečevanje gozdnatosti na 72,5%.
Ključne besede: zaraščanje, GIS, Kras, analiza krajine, daljinsko zaznavanje, Landsat, Ikonos
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4643; Prenosov: 1930
Celotno besedilo (4,99 MB)

Povzetek: V treh sestojih jelovo-bukovih gozdov na visokem krasu smo raziskali sestojno strukturo in njeno prostorsko zgradbo. Na treh raziskovalnih ploskvah, velikih2 ha, smo izmerili koordinate dreves ter njihove dendrometrijske znake.Raziskovalne ploskve v treh sestojih se med seboj razlikujejo po svoji zgradbi, gostotah in tudi po parametrih prostorske zgradbe, ki smo jih ocenilina podlagi metod za ocenjevanje prostorske razmestitve dreves. Za drevesa v I in II debelinskem razredu smo izračunali višje povprečne relativnerazlike v sestojnih gostotah kot za debelejša drevesa. Ko so vzorčne ploskve presegle velikost 6 a, so bile povprečne relativne razlike pri ocenjevanju števila dreves v III debelinskem razredu v vseh treh sestojih manjše od 30 % v vseh treh sestojih. Na podlagi teoretičnih modelov je bilo mogoče o šopasti rasti dreves sklepati le v sestoju s prevladujočo jelko. V dveh sestojih jelke in bukve smo določili tudi sestojne skupine, ki so jih oblikovala drevesa na površini do 0,5 ha. Za jelko, smreko in bukev smo ocenili (P<0,01), da se njihova prostorska razmestitev razlikuje od slučajnostne, te drevesne vrste pa so oblikovale tudi različno velike sestojneskupine na površini do 0,25 ha. Ker so bila dominatna drevesa v vseh treh sestojih enakomerno in slučajnostno razporejena, sklepamo, da sestoji tudi po obdobju propadanja jelke niso postali razgrajeni.
Ključne besede: sestojna gostota, prostorska razmestitev, jelovo-bukovi sestoji
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4598; Prenosov: 1990
Celotno besedilo (404,54 KB)

Povzetek: This paper presents a case study in windthrow. The case study area was 1.7 ha of two forest gaps on the Pokljuka plateau, Slovenia, where strong wind had blown down 44 trees. An additional 44 standing trees closest to the fallen trees were used as a control group for comparative purposes. The following variables were measured for fallen trees: breast diameter, height, crown diameter and height as well, the number and diameter of roots, the volume of the root system, and root rot. Standing trees were measured for breast diameter, height, crown diameter and height, and the number and diameter of roots. The data were analysed using the machine learning methods in the Weka computer program. The most important factors of windthrow in the case study area were: storm wind (speed above 17 m/s), wet shallow soil, and the edges ofthe forest gaps. The results of the case study show that breast diameter, tree height and the presence of root rot can be classified as windthrow factors.
Ključne besede: wind, windthrow, root rot, factors of windthrow
Objavljeno v DiRROS: 12.07.2017; Ogledov: 4192; Prenosov: 1879
Celotno besedilo (1,44 MB)