20.500.12556/DiRROS-7610 Ocenjevanje prostorske zgradbe jelovo-bukovih sestojev Assessing spatial structure in the beech and silver fir forest stands 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. Stand structures and spatial patterns were studied in three plots in the beechand silver fir forest on the Karst Plateau in Slovenia. We mapped all stems >10 cm in diameter at breast height (dbh) on 2 ha plots. The structure of the forest stands on three research plots varied in stand density and in the spatial distribution of stems, analysed using different methods for the characterisation of spatial distribution of trees. The mean relative differences for measuring tree density were substantially greater for trees <50 cm or <30 cm than those for large-diameter trees. Relative difference declined after a plot size of about 6 a, where mean relative differences for the >50 cm dbh class were less than 30 %. Based on theoretical models of spatial distribution, a tendency of clustering or clumping of trees was evident in the stand dominated by silver fir. In two beech and silver fir stands, stems were aggregated in large patches of up to 0.5 ha in size. The spatial distribution of silver fir, spruce and beech varied significantly (P<0,01) from a random distribution. Stems of these species aggregated in small and medium patches up to 0.25 ha. Dominant trees were regularly and randomly distributed in the three stands, indicating that after the period of silver fir decline the structure of stands did not deteriorate. sestojna gostota prostorska razmestitev jelovo-bukovi sestoji stand density spatial distribution beech and silver fir stands true false true Slovenski jezik Slovenski jezik Pregledno delo 2017-07-12 09:18:34 2017-07-12 09:18:34 2022-08-12 14:06:15 0000-00-00 00:00:00 2004 0 0 str. 165-186 Vol. 74 2004 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*56:176.1--1(497.12*14) 0351-3114 URN:NBN:SI:doc-4YLXWDNU 1325990 6206978 RAZ_Hladnik_David_i2004.pdf RAZ_Hladnik_David_i2004.pdf 1 0E4201ECB5F169A5F34CEF36407DBEC6 b3fdd1a61cf318817919d8d0ccd1297e250a218ea278f6868c5d5e7746338d55 1d3b1de3-17b5-11ed-b6b8-001a4af901a5 20.500.12556/dirros/2dbb5298-1e31-4c0b-b23f-af9d38a9dc84 https://dirros.openscience.si/Dokument.php?lang=slv&id=9477 Gozdarski inštitut Slovenije Acta Silvae et Ligni 0 0 0