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ŠUMARSKI LIST 1-2/2009 str. 27     <-- 27 -->        PDF

M. Prka, T. Poršinsky: USPOREDBASTRUKTURE TEHNIČKE OBLOVINE JEDNODOBNIH BUKOVIH ...Šumarski list br. 1–2, CXXXIII (2009), 15-25
more simple and adequate for wood assortments of the best quality, veneer
logs – A quality class (Fig. 1) and assortments of the lowest quality class, 3rd
class sawlogs – D quality class (Fig. 4). The comparison is much more difficult
with other quality classes of technical roundwood, logs for rotary cutting


–1st quality class sawlogs – B quality class (Fig. 2), 2nd class sawlogs – C
quality class (Fig. 3), due to even more significant differences between standard
requirements with respect to dimensions, range of timber defects, and
number of quality classes.
Differences between the Croatian standards for forest harvesting products
(1995), still applied in Croatian forestry and international standards
Hardwood round wood – Qualitative classification – Part 1: Oak and Beech
EN 1316-1:1999 are numerous and significant. Differences are related to the
number of quality class, prescribed minimum dimensions, range of roundwood
defects along with way of measurement of technical roundwood and
they reflect to different share of wood assortments (quality classes) determined
in accordance with the requirements of individual standards. However,
the key difference between these two standards lies in the fact that according
to the „old” Croatian standards technical roundwood was classified by purpose,
and according to the „new” Croatian standards technical roundwood is
classified by quality, therefore avoiding to define its future purpose.
Consequently, the comparison of percentage shares of wood assortments in
the assortment tables is difficult, and defining unambiguous conclusions
(except for assortments of technical roundwood of the highest and lowest
quality) is questionable.


Differences in contents between international standards and standards
currently in use in Croatian forestry shall necessarily bring operational
changes in bucking, scaling, classifying and marketing of forest products.
Operational changes (partly conditioned by the acceptance of international
laws and regulations) shall also be accompanied by certain changes in relationships
within the forestry sector.


Key words:assortment tables, Croatian standards of forest harvesting
products 1995, Croatian Standard HRN EN 1316-1:1999, even-aged beech
stands