Forest Measurements Exam 1 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Why is Diameter an Important Measurement in Forestry? - CORRECT ANSWER -
Crucial for assessing tree growth, timber volume, and estimating age.
DBH-Proper Height, Potential Problems, and Instruments Used? - CORRECT ANSWER -
Proper Height: 4.5 ft on uphill side of tree
Potential Problems: Irregularities such as bulging and branches at 4.5 feet. Forks below 4.5 feet.
Leaning and multi-stemmed trees
Instruments used: DBH Tape, Loggers Tape, Biltmore Stick, Calipers
Calculate Diameter from Circumference, Whats the Relation with a DBH Tape? - CORRECT
ANSWER - D=C/pi
A DBH tape is calibrated to show diameter based off the trees circumference.
How to Measure DBH for Trees with Bulges or Forked Trees? - CORRECT ANSWER -
Measure the nearest point to DBH where the tree is normal.
Measure the two trunks as separate trees.
Basal Area (BA) - CORRECT ANSWER - Def: The cross-sectional area (in square ft) of a
tree at DBH
Formula: BA=(pi)(DBH)^2/4
Importance: Basal area helps determine the density of a forest, tree competition, and potential
timber yield.
Tree Height Importance - CORRECT ANSWER - Importance: Tree height is necessary for
volume estimation, forest growth assessment, and wildlife habitat analysis.
, Using a Clinometer - CORRECT ANSWER - Left Side (Percent Scale): 100 feet from
base of tree, try to be level with the tree, top-bottom angle readings.
Height=(angle)(distance)/100. If 70 ft from tree, H=(a)(.7)/100
Right Side (Topo Scale): 66 feet from tree, try to be level with tree, top reading-bottom reading.
Potential Problems with Measuring Tree Height? - CORRECT ANSWER - Obstructed
view of top of tree, uneven terrain, leaning trees
Height for Trees on Steep Slope - CORRECT ANSWER - 1) 100 ft from tree
2) Measure slope using & scale on clinometer
3) Multiply 100 ft with slope adjustment factor (table)
4) Back up to adjustment
5) Measure Height as normal
Height for Leaning Trees - CORRECT ANSWER - 1) Identify fall line beneath tree top
(use marker)
2) Measure from tree base to fall line
3) Measure distance from tree top to bottom of fall line (Clinometer)
4) Use Pythagorean Theorem to determine the hypotenuse of the triangle (the tree).
Merchantable Height - CORRECT ANSWER - Useable portion of tree
Can be cut into salable lumber (16 ft log sections)
Height of tree up to 4", 6" or 8" in diameter
Varies by species
Crown Classes - CORRECT ANSWER - Dominant-crowns extend above general canopy
Co-Dominant-general height of canopy
Intermediate-subordinate position, some direct sunlight on top
ACTUAL Exam Questions and CORRECT
Answers
Why is Diameter an Important Measurement in Forestry? - CORRECT ANSWER -
Crucial for assessing tree growth, timber volume, and estimating age.
DBH-Proper Height, Potential Problems, and Instruments Used? - CORRECT ANSWER -
Proper Height: 4.5 ft on uphill side of tree
Potential Problems: Irregularities such as bulging and branches at 4.5 feet. Forks below 4.5 feet.
Leaning and multi-stemmed trees
Instruments used: DBH Tape, Loggers Tape, Biltmore Stick, Calipers
Calculate Diameter from Circumference, Whats the Relation with a DBH Tape? - CORRECT
ANSWER - D=C/pi
A DBH tape is calibrated to show diameter based off the trees circumference.
How to Measure DBH for Trees with Bulges or Forked Trees? - CORRECT ANSWER -
Measure the nearest point to DBH where the tree is normal.
Measure the two trunks as separate trees.
Basal Area (BA) - CORRECT ANSWER - Def: The cross-sectional area (in square ft) of a
tree at DBH
Formula: BA=(pi)(DBH)^2/4
Importance: Basal area helps determine the density of a forest, tree competition, and potential
timber yield.
Tree Height Importance - CORRECT ANSWER - Importance: Tree height is necessary for
volume estimation, forest growth assessment, and wildlife habitat analysis.
, Using a Clinometer - CORRECT ANSWER - Left Side (Percent Scale): 100 feet from
base of tree, try to be level with the tree, top-bottom angle readings.
Height=(angle)(distance)/100. If 70 ft from tree, H=(a)(.7)/100
Right Side (Topo Scale): 66 feet from tree, try to be level with tree, top reading-bottom reading.
Potential Problems with Measuring Tree Height? - CORRECT ANSWER - Obstructed
view of top of tree, uneven terrain, leaning trees
Height for Trees on Steep Slope - CORRECT ANSWER - 1) 100 ft from tree
2) Measure slope using & scale on clinometer
3) Multiply 100 ft with slope adjustment factor (table)
4) Back up to adjustment
5) Measure Height as normal
Height for Leaning Trees - CORRECT ANSWER - 1) Identify fall line beneath tree top
(use marker)
2) Measure from tree base to fall line
3) Measure distance from tree top to bottom of fall line (Clinometer)
4) Use Pythagorean Theorem to determine the hypotenuse of the triangle (the tree).
Merchantable Height - CORRECT ANSWER - Useable portion of tree
Can be cut into salable lumber (16 ft log sections)
Height of tree up to 4", 6" or 8" in diameter
Varies by species
Crown Classes - CORRECT ANSWER - Dominant-crowns extend above general canopy
Co-Dominant-general height of canopy
Intermediate-subordinate position, some direct sunlight on top
