574 KB54 KB193820262015Bitorajc, ZoranDiaci, JurijKrese, AnžeRozman, AndrejRoženbergar, Dušanštevilka:5/6letnik:73str. 243-258ISSN:0017-2723COBISSID:4104102URN:URN:NBN:SI:doc-YDT8EOQHslZveza društev inženirjev in tehnikov gozdarstva in lesarstva SlovenijeGozdarski vestnikgradacijanaravno pomlajevanjeograjePicea abies (L.) Karst.veliki smrekov lubadarObnova gozda po gradaciji velikega smrekovega lubadarja (Ips typhographus) v drugotnih smrekovih gozdovih na Kočevskem| Forest regeneration after European Spruce Bark Beetle (Ips typhographus) outbreak in secondary Norway Spruce forests in Kočevje region|In 2003 within the management unit Vrbovec (Kočevje) a massive bark beetle (Ips typhographus) outbreak occurred in the secondary Norway spruce forest. In order to determine the current status and ten-year development of regeneration and to identify the main factors influencing regeneration, 240 research plots (1.5 m x 1.5 m) were inventoried in 2005 and 2013. The plots were equally distributed with regard to the following factors: fencing, position within opening (centre / edge) and relief (plateau / sink-hole). Seedlings were monitored according to the species, age and height classes on these plots. The herb layer was also investigated. In 2005 and 2013 the total seedling density amounted to 58.000 and 43.000 specimens / ha. At the first inventory, tree species mixture was dominated by Norway spruce (77%), followed by pioneer species (12%). With the development of the regeneration the proportion of spruce decreased to 65%, while the increase of the pioneers (20%) was the most notable. The impact of overbrowsing was also observed. Fenced openings were characterised by a greater overall density of regeneration, more favourable seedling height structure, and 3.5 times higher coverage of broadleaves. Seedling density of individual tree species was influenced by the distance to seed trees (lime) and the distance to the edge of openings (spruce). Development of regeneration indicated gradual improvement of the microclimate conditions in the future. The seed potential and the appropriate forest tending may favour development of the climax tree species (beech) in the futureV GGE Vrbovec (GGO Kočevje) se je leta 2003 v drugotnih smrekovih gozdovih na Kočevskem pojavila velikopovršinska gradacija velikega smrekovega lubadarja (Ips typhographus). Z namenom, da bi proučili stanje in desetletni razvoj pomladka ter ugotovili glavne vplivne dejavnike, je bil v letih 2005 in 2013 opravljen popis stanja na skupno 240-ih ploskvah (1,5 x 1,5 m), ki so bile enakomerno zastopane glede na ograjenost, lego v sestojni odprtini (središče/rob) ter glede na relief (plato/ vrtača). Na ploskvah so bile popisane vse lesnate vrste, ki so bile razvrščene v starostne in višinske razrede, hkrati je bil opravljen tudi popis zeliščne plasti. V letu 2005 je znašala skupna gostota drevesnih vrst 58.000, leta 2013 pa 43.000 primerkov/ha. Pri prvi meritvi je zelo prevladovala smreka (77 %), ki so ji sledili pionirji (12 %). Z razvojem mladja se je delež smreke zmanjšal na 65 %, najbolj izrazito se je povečal delež pionirjev (20 %). Ugotovljen je bil negativen vpliv objedanja divjadi na obnovo gozda, saj so bile v ograjenih odprtinah gostote mladja večje, višinska struktura pomladka ugodnejša, listavci pa so zastirali 3,5-krat večjo površino. Na gostoto posameznih drevesnih vrst v pomladku so vplivala tudi semenska drevesa (lipovec) in oddaljenost do roba odprtin (smreka). Razvoj pomladka nakazuje postopno ustalitev mikroklimatskih razmer v prihodnje, kar ob semenskem potencialu in ustrezni negi gozda kaže na možnosti postopnega uveljavljanja klimaksnih drevesnih vrst (bukev)TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza gozdarskih društev Slovenije