Volume 6
Issue 1
Forestry
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume6/issue1/forestry/abs-01.html
DENDROECOLOGICAL CHARACTERIZATION OF DOUGLAS FIR (PSEUDOTSUGA MENZIESII FRANCO) IN THE WIELKOPOLSKA REGION
Edward Feliksik, Sławomir Wilczyński
ABSTRACT
Dendroclimatological analysis of Douglas firs growing in six different sites located from the east to west of the Great Poland Lowland area allowed us to determine that the factors that influenced the variability of annual wood increments were winter temperatures and the rainfall of spring and summer. The tree-ring width was positively influenced by higher than average temperatures in February and March and high amounts of rainfall from April to July. On the other hand, the increment was negatively influenced by high temperatures in May when the increment was formed and in the previous September. At sites further to the east, the more continental the climate the more pronounced was the impact of winter temperature on the tree-growth. Douglas fir within a radius of approximately 100 km were characterized by a similar rhythm of annual variability of tree-ring width, which was determined mainly by thermal conditions. Pluvial conditions, on the other hand, were the factor that diversified tre
Key words: dendroclimatology, dendrochronology, dendrochronological regionalism, dendroclimatological regionalism, Pseudotsuga menziesii.