اثر تغييرات ارتفاع از سطح دريا و خاك در زادآوري طبيعي و ساير خصوصيات كمي و كيفي درخت بلند مازو در جنگل گلندرود نوشهر

investigation of oak (Quercus castaneifolia) regeneration in Northern forests of Iran

Three elevation levels (300, 850, and 1200 meters above sea level) of Nowshahr forests were chosen to investigate regeneration and qualitive characteristics of oak (Q.castaneifolia) stands. At each elevation level 10 macro plots (1000 m2) were allocated randomly and systematically. At each macro plot 12 micro plots (1m2) were allocated along two diameters of the circle macro plots (northern -southern and eastern - western) by three meters intervals. The growth parameters which were studied at each macroplots were diameter of oak trees and other species, total hieght of oak trees and crown height of oak trees and oak trees quality (stem twist, stem crokedness, stem smoothness, crown harmony and branching). Coverʹpercent of herbal accompanied plants in each micro and macro plots were determined. The results showed that the best stands of oak species in view of dominant height and regeneration was found at the medium level of elevation(850 m) where as the best in view of quality was found at the lowest level of elevation (300m) . It means that by increasing the elevation, the quality of Oak stands were decreased. The soil type at 300 m and 1200 m elevation levels was brown autroph where as at 850 elevation level was calsic brown. The soil depth at each soil type was considerable.