NRM210_Assignment4 JA

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Western Carolina University *

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210

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Civil Engineering

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Jan 9, 2024

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docx

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2

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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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