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154. Strukturna pestrost gozdnih sestojev na Pahernikovi gozdni posestiAnže Martin Pintar, David Hladnik, 2018, original scientific article Abstract: Na Pahernikovi gozdni posesti je mogoče spremljati učinke in uspešnost vsaj polstoletnega gospodarjenja z raznomernimi gozdovi. Na podlagi podatkov kontrolne vzorčne metode in laserskega skeniranja Slovenije smo ocenjevali strukturno pestrost gozdnih sestojev s kazalniki in indeksi sestojnih gostot, vrstne in strukturne pestrosti debelinskih razredov, sestojnih višinskih razredov in njihovih zgornjih višin. Primerjali smo rabo zemljišč v katastrskih občinah, na katerih leži Pahernikova posest (k.o. Vuhred, Planina, Orlica in Hudi Kot), v letu 1825 z letom 2017. V vseh analiziranih katastrskih občinah se je delež gozda v tem obdobju stoletja povečal, na posesti pa se je povečal za 21,4 %. Razlike v sestojnih gostotah in kazalnikih sestojne pestrosti med sestoji, kjer gozda v začetku 19. stoletja ni bilo, in sestoji na ohranjenih gozdnih zemljiščih niso statistično značilne. V prevladujočem rastiščnem tipu kisloljubno gorsko-zgornjegorsko bukovje z belkasto bekico smo ocenili za 20 % višjo lesno zalogo od primerljivih gozdov tega rastiščnega tipa na Slovenskem. Ob višjih lesnih zalogah in visokih kazalnikih debelinske pestrosti v gozdovih na Pahernikovi posesti nismo ocenili višjih sestojnih gostot SDI kot v drugih rastiščno primerljivih gozdovih. Po gradientih nadmorskih višin smo ocenili razlike v višini in zgradbi sestojne strehe, ki vplivajo na gospodarjenje znotraj posameznega rastiščnega tipa.
Keywords: Franciscejski kataster, raba zemljišč, sestojna zgradba, LiDAR, sestojni višinski razredi, Pahernikova posest
Published in DiRROS: 04.02.2019; Views: 5477; Downloads: 3446
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157. Effect of temperature on the eradication of house longhorn beetle larvae in wood by microwave treatmentMartin Klinc, Franc Pohleven, 2017, original scientific article Abstract: In repressive protection of cultural/historical woodwork, microwaves have many advantages over conventional heating. The research%s objective was to examine conditions for eradication of house longhorn beetle larvae (Hylotrupes bajulus) in spruce wood (Picea abies) using microwaves. Larvae, inserted at different depths of spruce blocks containing 12% and 42% of moisture, were exposed to microwaves. Two apparatuses were used; a 750W commercial microwave chamber and a newly developed horn antenna microwave device with the power of 800W and a frequency of 2.45GHz, for targeted radiation. We discovered that the inner part of wood warmed up quicker than the surface heated to 65°C. For successful suppression larvae in the wood need to be heated to 54.5°C, for 10 seconds. The necessary exposure time increases with increasing thickness of wood. The surface of wood containing more moisture is heated quicker, but increased moisture slows down the penetration of microwaves into the wood specimen. Therefore, larvae in wood of lower moisture (12%) died faster, both those 20mm under surface (1.5min) and those at 130 mm of depth (10.5min).
Keywords: wooden objects, repressive wood protection, microwaves, heating, wood moisture content, house longhorn beetle, Hylotrupes bajulus
Published in DiRROS: 25.10.2017; Views: 4941; Downloads: 2886
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158. Ocena sestojne zgradbe na območju Krakovskega pragozdnega rezervata s segmentacijo podatkov laserskega skeniranjaDavid Hladnik, Anže Martin Pintar, 2017, original scientific article Abstract: In Krakovo virgin forest reserve we assessed stand structures on the basis of the laser scanning data of Slovenia and forest inventory permanent sampling plots. Large growing stocks (730 m3 /ha) and quantities of deadwood (27 % of growing stock) are characteristic for a reserve in the area of lowland, occasionally flooded forests. Pedunculate oak (83 %) and common hornbeam (12 %) prevail in the growing stock. We delineated stand structures in the forest reserve zone on the basis of the height difference using the procedure of the lidar data segmentation. On the digital model of tree crowns in the canopy of the central stand with the pedunculate oak in the upper level we determined only two unfilled gaps, larger than 100 m2 . In the neighboring managed forest, we classified the stands according to four-meter height classes from the height of 16 m to the heights of stand canopy over 32 m. Superficial forest stands% diversity was assessed using the spatial model, where the stands and stand subunits, larger than a quarter of a hectare, are presented.
Keywords: gozdni rezervati, sestojne strukture, Krakov, lasersko skeniranje Slovenije
Published in DiRROS: 03.09.2017; Views: 4122; Downloads: 771
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159. Nastanek in značilnosti barierne cone ter lesa nastalega po ranitviNiko Torelli, Primož Oven, Martin Zupančič, 1990, original scientific article Keywords: Abies alba, električna upornost, skorja, kambijeva cona, propadanje gozdov, drevesna kondicija
Published in DiRROS: 12.07.2017; Views: 4308; Downloads: 1848
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160. Električna upornost kot kazalec zdravstvenega stanja in možnosti jelk za preživetje na območjih z zračno polucijoNiko Torelli, Dušan Robič, Martin Zupančič, Primož Oven, Franc Ferlin, Bojana Križaj, 1990, original scientific article Keywords: jelka, Abies alba (Mill.), propadanje gozda
Published in DiRROS: 12.07.2017; Views: 4427; Downloads: 1834
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