Tree basal area
Tree Basal Area (TBA) is the crosssectional area (over the
bark) at breast height (1.3 metres above the ground) measured
in metres squared (m2). TBA can be used to estimate tree volumes
and stand competition. To determine Tree Basal Area simply
measure the diameter at breast height in centimetres (DBHOB)
and calculate the basal area (m2) using an equation based
on the formula for the area of a circle (area = p r2 where
r = radius and p = 3.142 ) and the formula for radius (r=diameter/2
= DBH/2).
Therefore:
Where DBH is the Diameter at Breast Height in
centimetres
This formula also converts the diameter in centimetres
to the basal area in square metres. The same technique can
be used to calculate the cross sectional area of the tree
at any point along the stem.
Tree Basal Area is the crosssectional area
of a tree at breast height.
Stand Basal
Area
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