In order to recognize the relationship between some qualitative characteristics of Acer hyrcanum (Hyrcanian maple) and site (the elevation above the sea level and direction of slopes), in the northern slopes
of Elburz, eight forest stands were studied from east to west limits of hyrcanian province in the north of Iran. In each stand according to variable conditions, some plots, and totaly 59 plots were seleCted and in each plot
different features were recorded as follows:
Altitude, direction of slopes, physiognomy, age of the forest stand, D.B.H. of trees, diameter of crowns, percentage of vegetation cover, total height, trunk length, branch bearing and crown symmetry of trees.
Data analysis indicates that the qualitative characteristics of the tree (Acer hyrcanum) including the height of trees, trunk length, crown symmetry and branch bearing are better from the low to the medium ranges of
elevation of distribution, as well as in northern slopes and related directions of the north.
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