11. Gozdni rastiščni tipi Slovenije, vegetacijske, sestojne in upravljavske značilnosti : Oddelek za gozdarstvo Biotehniške fakultete in Zavod za gozdove SlovenijeJurij Diaci, 2021, review, book review, critique Keywords: gozdovi, gozdna rastišča, tipologija, prikaz knjige
Published in DiRROS: 26.10.2021; Views: 1034; Downloads: 377
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13. Ohranjenost drevesne sestave in realizacija možnega poseka zmanjšujeta obseg sanitarnih sečenj v SlovenijiJurij Diaci, Maarten De Groot, Nikica Ogris, 2021, professional article Abstract: Splošno sprejeto stališče je, da s sonaravnim gospodarjenjem zmanjšujemo tveganja pri gospodarjenju z gozdovi. Za potrditev tega stališča obstajajo dobri zgledi gospodarjenja in posredni dokazi, primanjkuje pa znanstvenih študij, ki bi na podlagi kvantitativnih analiz to potrjevale. V Sloveniji smo potrdili pozitivne povezave med ohranjeno drevesno sestavo, rednim gospodarjenjem in manj sanitarnimi sečnjami. V dobi izrazitih okoljskih sprememb je smiselno spodbujati redno gospodarjenje z gozdovi. V prihodnosti bo zaradi socialno-ekonomskih sprememb še bolj izraženo opuščanje gospodarjenja. V članku razpravljamo o številnih prednostih rednega gospodarjenja. V prihodnje bo treba poleg vloge rednega gospodarjenja za preskrbo lesnopredelovalne verige večji poudarek nameniti pomenu dejavnega gospodarjenja za prilagajanje gozda na okoljske spremembe in za zdravje gozda.
Keywords: realizacija možnega poseka, aktiviranje gospodarjenja z gozdovi, zdravje gozda, podlubniki, sestoji smreke
Published in DiRROS: 14.04.2021; Views: 1515; Downloads: 424
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14. Private forest owner characteristics affect European spruce bark beetle management under an extreme weather event and host tree densityMaarten De Groot, Jurij Diaci, Kaja Kandare, Nike Krajnc, Rok Pisek, Špela Ščap, Darja Stare, Nikica Ogris, 2021, original scientific article Abstract: In the last few decades, an increasing number and intensity of bark beetle outbreaks have plagued the forests of Europe and North America. Bark beetle management is directly related to forest owner characteristics, although this relationship is not well understood. The purpose of the study was to investigate the influence of forest owner characteristics on the amount and timing of sanitary felling under different disturbance regimes and quantities of Norway spruce. We combined different databases on sanitary felling, the timing of sanitary felling, and forest owner characteristics for Slovenia from 2014 to 2018 and analyzed the amount and timing of sanitary felling in relation to forest owner characteristics. We found that the timing in winter and the amount of sanitary felling were positively associated with the distance of the owner%s residence to the forest parcel. Larger parcels were more affected by bark beetles but did not have later timing of cutting in the summer period as was hypothesized. The timing of sanitary felling decreased with property size, while with the probability of sanitary felling, the effect of property depended on the ice storm and the amount of spruce. The size of the settlement, the permanent address of the private owner, and timing of sanitary felling were positively associated but also depended on the amount of spruce. Gender and age did not have an important influence on the amount and timing of sanitary felling. Forest owners are an important factor in effective bark beetle management. This study highlights the private forest ownership characteristics that should be emphasized in order to fight bark beetle outbreaks in the event of large-scale disturbances. Governments should support forest owners who are at greater risk of bark beetle outbreaks and less efficient in managing outbreaks. Furthermore, landowner characteristics should be included when forecasting bark beetle outbreaks.
Keywords: close-to-nature management, sanitary felling, Ips typographus, forest pest management, forest owner characteristics
Published in DiRROS: 22.03.2021; Views: 1156; Downloads: 819
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15. Modeling of time consumption for selective and situational precommercial thinning in mountain beech forest standsDomen Arnič, Janez Krč, Jurij Diaci, 2021, original scientific article Abstract: Rationalization and optimization of work is becoming increasingly important in the European forestry sector. In this study a tool for modeling three different precommercial thinning approaches in young beech mountain stands was developed based on several field studies. The simulation examines three primary types of precommercial thinning: selective thinning and two types of situational thinning. We studied the impact of the number of candidates/crop trees and the impact of harvesting intensity on the structure and consumption of productive time. We found that in terms of costs situational precommercial thinning is more rational than selective precommercial thinning, that harvesting intensity has a significant impact on time consumption and that the number of candidates or crop trees has a significant impact on time consumption as well as on the relationships between main and auxiliary productive time. The modeling has shown that situational thinning is an alternative to selective thinning and that, in addition to requiring smaller and more efficient harvesting machines, it offers a cost-effective and ergonomic option (more walking, less chainsaw operation) for the pre-commercial thinning of young forest.
Keywords: precommercial thinning, selective thinning, situational thinning, modeling, crop tree
Published in DiRROS: 22.03.2021; Views: 1240; Downloads: 692
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16. Sodobno gojenje bukovih gozdovDušan Roženbergar, Andrej Ficko, Jurij Diaci, 2008, review article Keywords: nega gozdov, negovalni modeli, bukovi gozdovi, bukev, gojenje gozdov, Fagus sylvatica
Published in DiRROS: 17.11.2020; Views: 1203; Downloads: 374
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18. Značilnosti zaraščanja na opuščenih kmetijskih zemljiščih v HalozahMateja Cojzer, Jurij Diaci, Robert Brus, 2019, original scientific article Abstract: Namen raziskave je bil preučiti značilnosti in potek zaraščanja z grmovnimi in drevesnimi vrstami na opuščenih kmetijskih zemljiščih v Halozah. Ker se površine gozdov in zemljišč v zaraščanju iz desetletja v desetletje povečujejo, smo preučili trend njihovega naraščanja. Vegetacijsko sestavo na zemljiščih v zaraščanju smo primerjali z vegetacijsko sestavo mladih razvojnih faz gozda in na njihovi osnovi še strategije zaraščanja. Od leta 1985 do leta 2015 se je površina gozdov v Halozah povečala za 7,8 %. Ugotovili smo, da so se opuščena kmetijska zemljišča začela zaraščati z grmovnimi vrstami, z napredujočo sukcesijo sta se povečala število drevesnih vrst in gostota osebkov. Proces zaraščanja poteka prek stadijev 'Cornus sanguinea' - 'Cornus sanguinea' - 'Carpinus betulus'. Pri obnovitvenih procesih v gozdu so že od začetka prevladovale drevesne vrste, z razvojem gozda se je gostota osebkov manjšala, število vrst pa se bistveno ni spreminjalo. Sukcesijski razvoj vegetacije na zemljiščih v zaraščanju je progresiven ali napredujoč in poteka prek različnih stadijev od grmiščne h klimaksni vegetaciji. Končna vegetacijska stopnja vodi v obeh primerih v bukov gozd.
Keywords: Haloze, zaraščajoča se kmetijska zemljišča, sukcesijski procesi zaraščanja, vrstna sestava, gostota osebkov, Shannonov indeks pestrosti, pomembnost vrste, dominantne vrste
Published in DiRROS: 10.10.2019; Views: 6314; Downloads: 3110
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19. Reliefne značilnosti tal in objedanje mladja s strani velikih rastlinojedih parkljarjev v jelovo-bukovem gozduDušan Roženbergar, Robert Klevišar, Jurij Diaci, 2019, original scientific article Abstract: 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.
Keywords: objedanje, gojenje gozdov, veliki rastlinojedi parkljarji, relief, pomlajevanje, Abies alba, Fagus sylvatica, Acer pseudoplatanus
Published in DiRROS: 08.07.2019; Views: 7016; Downloads: 2931
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