مقايسه تركيب و ساختار توده هاي طبيعي و بهره برداري شده در جنگل هاي بلوط لوه گرگان

Comparison Structure of the natural and managed Oak (Quercus castaneifolia) Stand (shelter wood system) in Forest of Loveh, Gorgan

Knowledge of forest structure and its complications are very important and necessary in forest management. The aims of this study was to investigate structure in unmanaged Oak stands and were compared with managed stands including 25 and 45 years practiced stands (Shelter wood system) in the Loveh forest, north of Iran. In this study 45 plots were selected with dimension 50x50 m with systematic randomness layout. Then al1 of tree variables measured and recorded including: species name, DBH, total height, trunk height and diameter of the canopy. The results showed that unmanaged stand have difference significant (P<0.003) with 25 and 45 years managed stand in DBH, basal area, density, total height, trunk height and canopy area. Unmanaged stand has maximum DBH (56. 4 em) while 45 years practiced stand has minimum DBH (22.5 em). Basal area (44.57 and 20.77 rrrʹ) and height (22.6 and 18.12m) were influenced respectively. Also 45 year-old and natural stands have account density maximum and minimum (521 and 230 per hectare). Natural stand is including maximum canopy area with (218.5 mʹ / hectare) and 45 year-old its have a minimum canopy area (98. 7mʹ/hectare). General1y, results showed that density trees in stands with canopy area have relationship reverse.