Natural Resource BiometricsBasal AreaBasal area per tree is the cross-sectional area of a tree at breast height. It can be calculated from Diameter at breast height (DBH) by the following English formula: where:
DBH is the diameter at breast height in inches. is the constant 3.1415. It can be calculated from Diameter at breast height (DBH) by the following metric formula: where:
DBH is the diameter at breast height in centimeters. is the constant 3.1415. Basal area per acre is the sum of all the basal area per tree in the acre. Basal area per acre or hectare is a standard measure of the size-density relationship in a stand. where:
BA_{i} is the Basal area per tree for the ith tree W_{i} is the sample expansion factor weight. Figure 1. An illustration of the basal area per acre. The basal area per tree is the cross-sectional area of each tree at breast height(the black ellipses). Basal area per acre would be the sum of these cross-sectional areas for all trees in an acre. |
Natural Resources Biometrics by David R. Larsen is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License . Author: Dr. David R. Larsen Created: November 8, 1999 Last Updated: July 25, 2018 |