DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 11-12/2006 str. 48 <-- 48 --> PDF |
M. Prka: VISINA I ČISTOĆA DEBLA BUKOVIH STABALA PO VRSTI SIJEKA I POSTOTAK ... Šumarski list br. 11–12, CXXX (2006), 511-522 the tree trunk in thinning and preparatory felling on one side, and seeding and final felling on the other side. Trend lines of average values of technical roundwood in the tree trunk of the thinning and preparatory felling have a falling and convex form, while the trend line form of the seeding and final felling is concave. Furthermore, we can conclude that the participation of technical roundwood of trunk increases from thinning felling towards preparatory felling. Average values of participation of technical roundwood of trunk of the whole sample of exemplary trees show a linear dependence on diameter class and the falling trend which is a consequence of the increased quantity of technical roundwood produced from the tree tops with the increase of the breast diameter. Higher participation of technical roundwood in tree trunks according to the Croatian Standards can be interpreted by larger amount of technical roundwood produced from tree tops according to the European Standards. This is the result of smaller minimal dimensions and higher tolerance of flaws for D quality class of technical roundwood according to the European Standards. Key words: beech, trunk height, trunk purity, technical roundwood from trunk and tree top |