U radu je istraživana vjerojatnost pojave drvnih sortimenata tehničke oblovine u bukovim stablima s obzirom na vrstu sijeka, kao i tijek postotnih udjela drvnih sortimenata tehničke oblovine po debljinskim stupnjevima i vrsti sijeka. Istraživanja su provedena na uzorku koji obuhvaća 787 stabala u proredama, 788 stabala u pripremnim, 862 stabla u naplodnim i 645 stabala u dovršnim sjekovima. Sveukupno je istraživanjima obuhvaćeno 3082 primjerno stablo. Starost istraživanih sječina iznosila je od 59 do 91 godinu kod prethodnog prihoda (proreda), od 94 do 110 godina kod pripremnog sijeka, od 100 do 112 godina kod naplodnog sijeka, te od 98 do 114 godina kod dovršnog sijeka. Na temelju rezultata istraživanja izrađene su nove sortimentne tablice prema hrvatskoj normi HRN EN 1316-1:1999.
Tablice šumskih drvnih sortimenata koje uvažavaju vrstu sijeka kao jedan od ulaza, omogućuju pouzdaniju procjenu sortimentne strukture sječine i preciznije planiranje sječivog etata. Pri tomu su kao čimbenici razdvajanja uzeti kriteriji selekcije prilikom doznake stabala za sječu koji se primjenjuju do uključivo pripremnog sijeka. Iz tih su razloga tablice šumskih drvnih sortimenata izrađene zasebno za prorede i pripremni sijek, a zasebno za naplodni i dovršni sijek.The subject of research was probability of appearance of technical roundwood timber assortments in trees according to type of felling, as well as the difference between shares of technical roundwood timber assortments according to diameter class and type of felling. On the basis of the research results, new assortment tables were made according to Croatian Standards HRN EN 1316-1:1999. Research was carried out on a sample consisting of 787 trees in thinning felling, 788 trees in preparatory felling, and 862 trees in seeding felling and 645 trees in final felling. An overall number of 3082 exemplary trees were included in the research. The age of the felling areas studied was between 59 and 91 years in the preliminary yield (thinning), 94 to 110 years in preparatory felling, 100 to 112 years in seeding felling, and 98 to 114 years in final felling areas.
Timber assortment tables that take into consideration the type of felling as one of the inputs, enable a more reliable estimate of assortment structure of the felling area and more precise planning of timber mass marked for felling. In this case, as a distinguishing factor, we took the selection criterion for marking trees for felling which is applied for the types up to, and including, the preparatory felling. For that reason, timber assortment tables were made separately for thinning and preparatory felling, and separately for seeding and final felling.
Seeding and final felling show by ca 11 % higher shares of top quality timber assortment (A and B class) than thinning and preparatory felling. On the other side, thinning and preparatory felling show by ca 11 % higher shares of technical roundwood assortment of lower quality (C and D class) than seeding and final felling
