Seedling seed orchard (SSO) growing conditions are different to those in the
forest. Trees grow in wide spacing with more access to sunlight and competition
between trees is less intense causing larger annual rings and limited height
growth. The objective of this research was to: 1) determine the density and
mechanical properties of Scots pine (Pinus sylvestris L.) wood grown in an SSO
and 2) suggest the most suitable use of this wood. Five trees (25-year-old) were
selected using the Urich II method. Final samples (from the height of dbh) were
cut from pith to bark, in the four cardinal directions. From all five trees,
159 samples were used to determine: 1) the wood density, 2) the compressive
strength parallel to the grain, 3) the modulus of rupture, and 4) the strength
quality coefficient. For each property the following mean values were obtained:
327 kg m-3, 32 MPa, 59 MPa and 0.10, respectively. The density did not depend
on the dbh or mean width of annual ring. At the same time, the mechanical
properties depended strongly on the wood density. In all cases, the wood property
values of the Scots pine from the SSO were lower in comparison with those
published for Scots pine grown in regular stand conditions. Therefore, pine wood
from SSOs should be used in the paper industry.
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