بررسی مناسب ترین تراکم وترکیب افرا و ون در جنگلکاری

In order to determine the most suitable combination and interval space planting of maple (Acer velutinum Bois.) and ash, (Fraxinus excelsior L.) in reforestation, effect of three levels of planting space (1.51.5ا, 2ا2 and 2.52.5ا meters) and five levels of planting combination (100% of ash seedlings, 65% of ash seedlings+35% maple seedlings, 50% of ash+50% of maple, 35% of ash+65% of maple and 100% of maple seedlings) were investigated. Statistical design was split plot with three replications. The site allocated in north- west aspect and 250 meters a bow .see .level in south of Sari in Mazandaran province. After termination of five years period, effect of planting combination and planting interval levels was no significant on collar diameter and height growth of seedlings. The effect of seedling density (interval spacing) was no significant on seedlings quality. But it was significant on seedlings survival (p