Service Forester's Handbook

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====== Basal Area and Trees Per Acre Table for Prism Sampling ======
^Plots (trees)             ^^^Plots (trees)            ^^|
^DBH   ^Basal Area  ^Per Acre^DBH   ^Basal Area ^Per Acre|
^Inches^Sq. Feet    ^BAF = 10^Inches^Sq. Feet   ^BAF = 10|
|4     |.087        |114.94  |18    |1.767      |5.66    |
|5     |.136        |73.53   |19    |1.969      |5.08    |
|6     |.196        |51.02   |20    |2.182      |4.58    |
|7     |.267        |37.45   |22    |2.640      |3.79    |
|8     |.349        |28.65   |24    |3.142      |3.18    |
|9     |.442        |22.62   |26    |3.69       |2.71    |
|10    |.545        |18.35   |28    |4.28       |2.34    |
|11    |.660        |15.15   |30    |4.91       |2.04    |
|12    |.785        |12.74   |32    |5.59       |1.79    |
|13    |.922        |10.84   |34    |6.31       |1.58    |
|14    |1.069       |9.35    |36    |7.07       |1.41    |
|15    |1.227       |8.15    |38    |7.88       |1.27    |
|16    |1.396       |7.16    |40    |8.73       |1.14    |
|17    |1.576       |6.35    |      |           |        |

For a prism calibrated to BAF = 10, a tree with a DBH of
10 inches represents a plot of (1/18.35) of an acre.\\
\\
For other prisms calculate the plots per acre by using this
formula: \\
Plots per Acre = (BAF of prism/Basal Area)\\
\\
To obtain Basal Area, multiply (DBH)<sup>2</sup> by .00545\\
Example no. 1: (10")<sup>2</sup> X .00545 = .545sq.ft.\\
Example no. 2: (16")<sup>2</sup> X .00545 = 1.395sq.ft\\

Service Forester's Handbook

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