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2102 Exam 1 pt 4
Timber cruising
| Question | Answer |
|---|---|
| 1. Calculate radius of a 0.2-acre circular plot. | 1 acre= 43560sq.ft., 43560 x 0.2= 8712 sq. ft. A= 3.14 x r^2, 8712= 3.14 x r^2 8712/3.14= r^2 2774.52= r^2 square root of 2774.52= r 52.67ft.= radius of 0.2-acre circular plot |
| 2. In what case is the 100% tree tally appropriate? | - small tracts -high value timber |
| 3. Cruise intensity is defined as cruise %. What is cruise % when 50 plots of size 0.1 acres each are sampled from a 100-acre tract? | total acres / 100; 50 X 0.1=5 5/100= 0.05= 5% |
| 4. We want to perform a 5% cruise on a 20 ch. x 30 ch. rectangular tract. How many 0.2-acre plots will we need? | 20ch. x 30ch.= 600ch.^2 10ch.^2= 1ac., 600/10= 60 acres |
| 5. Given the following volume table and the total tree tally on 12 plots of 0.1-ac each, compute trees/acre, basal area/acre, and volume/acre. | 12 X 0.1= 1.2ac total # trees/ac-> total trees/total ac; 250/1.2= 208 TREES/AC BA->0.005454(150(6^2)+100(8^))/1.2= 53.63FT^2/AC weight/ac-> 100(0.036)+50 |
| 6. Suppose a plot cruise was performed on a tract, using a total of 3 plots of size 0.2 acres each. A summary of the data is presented below. Compute 1. Number of trees per acre. 2. Basal area per acre. 3. Total weight in tons per acre. | 1.190/2.0 = 95 trees/ac 2. 25ft^2/ac 3. 341tons/ac |
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MaddieAlexE
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