Biometrics formulas

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7 Terms

1
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Using an angle gauge with BAF of 10, one 7’’ tree tallied represents how many trees/ acre?

1833.465/(7²)

2
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For a BAF-10 prism or angle gauge, what is the plot radius in feet for a tree having a dbh of 13.5 inches?

R=2.75(13.5)

3
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Compute the cruise % for the following strip cruise: Strips 0.5 chains wide spaced 5 chains apart (assume rectangle)

P= 0.5/5= .1 = 10% cp

4
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What is the total acreage if a total of 2 miles of strips were cruised?

160 x .5= 80 ch² = 8 ac 0.1=8/x x=80ac

5
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Vol/ac

sum of (# logs per D)(vol table)/(total area sampled)

6
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Stand table

Each DBH individually then added, sum of (# trees)(Vol table)/(number of points) (1833.465/D²)

7
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VBAR

sum of (# trees)(VBAR table)/ (# points)