EXAM III FR 3218/5218 Semester II - 2005

If it is not clear what a question is asking, request clarification from the instructor. Misreading a question is not grounds for partial credit. To receive partial credit for the calculation problems, formulas and intermediate calculations must be legibly shown. The number preceding the question number is the point value of that particular question. Total points = 58.

(10) 1. The following four (4) trees were tallied using a 30BAF variable-radius plot. Find the plot observations of trees per acre, basal area per acre, and volume per acre.

Tree	DBH	Height	Volume
1	12	60	18
2	14	70	30
3	10	50	12
4	12	40	14

i. trees per acre observation

ii. basal area per acre observation

iii. volume per acre observation

(4) 2. A cruise consisted of 15, 20BAF variable-radius plots. On these 15 plots, 12, 10-inch DBH red pine were tallied. Based on this cruise, what is the stand table entry for 10-inch DBH red pine?

(3) 3. For the volume table you are using, the average VBARs by height are:

Height	40	50	60	70
Average VBAR	16	21	25	29

Using this information, and ignoring DBH, what would the volume per acre observation be for the plot in question 1?

(4) 4. What gets observed on the first and second phase plots when you use double (two phase) sampling with variable-radius plots to estimate volume per acre?

i. first phase

ii. second phase

(3) 5. What is the advantage of using a sampling with partial replacement (SPR) design over a regular continuous forest inventory (CFI) design for distributing permanent sample plots over an ownership?

(3) 6. What tree attribute is used to determine whether a tree will be sampled in 3P sampling? Be specific; tree size is not a specific enough answer.

(3) 7. List three (3) core pieces of information (there are more than three) collected at a plot that are used to make decisions at Potlatch:

(3) 8. What is the overall mission of the Forest Inventory and Analysis (FIA) unit of the USFS?

(5) 9. Develop a base age 50 anamorphic site index equation from the dominant height growth equation:

ln(H) = 5 – 24 * (1/A)

(3) 10. What age of stands (young, medium, old – circle one) is the height intercept method of site quality determination used for? What do you need to measure to obtain a site quality estimate using the height intercept method?

(4) 11. What does a tree area ratio (TAR) value of 90 mean? What does a crown competition factor (CCF) of 200 mean?

i. TAR of 90

ii. CCF of 200

(8) 12. The upper and lower management lines for your agency’s density management diagram are given by (see sketched chart below, but use equations for answering the question):

You need to determine when to first thin a stand that presently has 600 trees per acre and a quadratic mean DBH of 6.0 inches.

What will the basal area per acre of the stand be at the first thin (before thinning)?

If row thinning is used for the first thin, what amount of basal area will be removed?

If a thin from below with a D-ratio (quadratic mean DBH after thinning relative to quadratic mean DBH before thinning) of 1.05 is used in the first thin, what amount of basal area will be removed?

(5) 13. You need to “clean” a stand that presently has 250 trees per acre with a basal area per acre of 115 square feet. The prescription is to reduce the stand’s stocking to 70 percent using standard stocking chart methodology. Identify on the attached chart the stand’s current state (with an X) and its state after cleaning (with a Y). If there’s currently 30 square feet per acre of unacceptable growing stock in the stand, how much of the unacceptable growing stock will you be able to remove in this first cleaning (assuming good spacing)?

“Equation sheet”