Šumarski list, Vol. 132 No. 5-6, 2008.
Izvorni znanstveni članak
Defining Assortment Structure of Even-Aged Beech Stands According to Standard Hrn En 1316-1:1999
Marinko Prka
orcid.org/0000-0001-8869-1835
; Hrvatske šume Direkcija
Sažetak
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.
Ključne riječi
assortment structure; common beech; Croatian Standard HRN EN 1316-1:1999; even-aged beech stands
Hrčak ID:
25850
URI
Datum izdavanja:
30.6.2008.
Posjeta: 1.635 *