Kasvuomaduste erinevused hariliku m nni (Pinus sylvestris L.) j rglaskatsetes

The progeny trials of Scots pine were founded in J rvselja Training and Experimental Forest District in 1967 and 1968 by Professor E. Pihelgas. The aim of the present paper is to analyze the influence of seed origin (mother stands) and seed source (plus trees, single trees and mixture of seeds from different trees) on the growth performance of progeny trials of Scots pine. Spatial and dendrometric data of selected mother trees are presented in Tables 1-3. In 1967 and 1968 total of 5.65 ha were planted with two-year old seedlings, with spacing 1.5×1.25m. In 1995 and 2008 all trees of the progeny trial were callipered and nine sample trees were measured for height on each plot. Our progeny data set consists of 4622 DBH and 486 height measurements. We distinguished two groups of regions: (1) maritime - regions close to the sea and (2) inland - regions having distance more than 50 km from the coastline. The analysis was carried out with the SAS/GLM procedure. It was proved that height of inland-originated progeny stands was significantly higher than height of progeny stands originated from maritime regions. Plus-tree progeny stands exceeded single tree and mixture-of-seeds progeny stands in height, diameter, basal area and volume. Influence of mother stands and the age of mother trees on the height of progeny trials established in 1967 and 1968 had different trends, which can be caused by the unbalanced structure of the trial established in 1967 or epigenetic character of the influence caused by the age of mother stands.