The degree of crowding of trees, expressed by various growing-space ratios such as crown-length to tree-height, crown-diameter to diameter-at- d.b.h..; or crown diameter to tree height.

a relative measure of the amount of stocking on a forest area. Often described in terms of stems per hectare.

a quantitative measure of stocking expressed either absolutely in terms of number of trees, basal area, or volume per unit area or relative to some standard condition