بررسي ساختار و روند تحولي توده هاي طبيعي در راشستان هاي شمالي ايران (مطالعه موردي : خيرودكنار- نوشهر)

Investigating the Structure and Evolution Process of Beech Forests Natural Stands in North of Iran (Case study: Kheyrood-kenar, Noushahr)

In order to know about the structure of natural stand that have considerable ability of auto-regeneration and auto-regulation, it is needed to access the knowledge about the evolution process of forest ecosystem before planning for harvesting. This knowledge could be useful to determine a suitable pattern for the selection of silvicultural method. To obtain the structure condition and evolution process in this study, ten plots of one hectare area each (with grid or dimension of 100 m* 100 m) were selected in Gorazbon district (Kheyroud-kenar Forest, Noushahr) and stand characteristics including number, D.B.H, height per hectare were measured in addition to crown diameter and height in strips with grid 10 m*100 m in each plot. The results illustrated that beech species was dominant with respect to height. Regarding high longevity of beech, discontinuous crown of trees, this stand is old with two or three storied and it is far from the optimal, showing the beginning of regeneration phase and passing destruction while overlaping aggradations (increasing stage) and destruction stage.