بررسي نقش برخي از عوامل محيطي بر روي خصوصيات كيفي نهال هاي راش

Influence of Some Site Conditions on Qualitative Characteristics of Beech Saplings

The influence of some environmental factors on qualitative behaviour of beechsaplings (Fagus sylvatica L.) was studied in various beech forest associations growing in submountane region (500-800 m.a.s.l) of switzerland. The experimental plots were established in regeneration gaps resulting from irregular shelterwood (Femelschlag) system. Within each gap, 15 sample plots were selected systematically. To determine light intensity, one hemispherical photograph was taken from each sample plot. The most important results are as following: -The quality and branching system of beech saplings were strongly correlated with light, polycyclism,length of the uppermost internode, browsing (game) damage and slope aspect. -Relative light intensity and slope aspect had significant effect on forming of distal terminal buds,which led to an increase in the proportion of silvicultural undesirable saplings. -Excess light resulted in a smaller length of the uppermost internode which was also smaller in the Lammas shoot than in the regular shoot. -The smaller was the length of the lammas shoots, the higher was the proportion of forked and broom shaped saplings.