نتايج تاثير عمليات پرورشي در جنگلهاي دست كاشت كاج تدا و توسكاي ييلاقي در ناحيه جلگه اي شمال ايران

Thinning is the most important operation in silvicultural planning . During operation dead and oppressed trees are harvested and retained tree grow increasingly . Two plantations of loblolly pine and Caucasian alder selected and thinning were carried out. Some results are as follows : Pinus taeda plantation