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NRM-210 Methods in Natural Resource Management
Class Assignment #4 – Tree Measurements
Name: ________Josh Allen_______________
Answer all the questions below.
Be sure to show your work in an organized manner and label
your answers with correct units.
1.
A tree has a dbh of 22.5 inches. What is the basal area in feet
2
?
22.5x22.5x0.005454= 2.76 square feet
2.
A tree has a basal area of 10 ft
2
. What is the dbh of this tree in inches?
10/.005454= square root of 1,833.516685= 42.82 inches
3.
You are sampling a 145-acre stand at a sampling intensity of 15%, using 1/20
th
acre sampling plots.
What number of plots will you have to install?
145x.2= 29 plots
What is the radius of the 1/20
th
acre sampling plot in feet? 43,560^2/20= 2,178 sq. radius= square
root of (2,178/3.1415) = 26.33 ft
4.
You are standing 80 feet away from a tree. The base of the tree is above you on a slope of 11°. You
measure the angle from you to the top of the tree (α1) as 75%. You measure the angle to the base of
the tree (α2) as 20%. What is the overall height of the tree in feet to the nearest 0.01 ft?
TA= 75%-20%= 55%
80ft/100x55= 44 ft
+
+
α1
α2
5.
Assume that a tree has a taper factor of 0.75. It measures 32 inches dbh. You are standing 102 feet
away and measure a 95 % angle to the top (α1) and 0% angle to the tree base (α2). What is the
volume of this tree in cubic feet?
H= 102/100x95 = 96.9ft
BA= 32x0.005454= 5.30914176 ft
96.9ftx5.3ftx.75= 385.84ft
Extra credit - 1pt—Describe one way that disturbance alters a forest?
A fire can alter a forest by clearing out all small growth and trees. Fires can also lead to the depletion
of wildfire and the resources wildlife need to survive.
+
α1
α2
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