AGN 143 Forestry Exam 2 Study guide Question and answers already passed 2024/2025
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Course
AGN 143
Institution
AGN 143
AGN 143 Forestry Exam 2 Study guide Question and answers already passed 2024/2025 AGN 143 Forestry Exam 2 Study guide
What is Timber cruising - correct answer •determination of the volume and appraised quality for a tract of timber
-Includes measurements of tree diameter, tree heights, def...
AGN 143 Forestry Exam 2 Study guide
What is Timber cruising - correct answer ✔•determination of the volume and
appraised quality for a tract of timber
-Includes measurements of tree diameter, tree heights, defect determination
and other features
What is Forest Measurements? - correct answer ✔•measuring and recording
information about trees in the forest (e.g. diameter, height, crown
classification, crown width etc...)
Why do we need to measure? - correct answer ✔•True forestry is not just
wandering through the woods staring at trees!
•In order to assess forest health and productivity, we need to be able to
quantify it's structure
•To achieve our management objectives and apply silvicultural treatments to a
forest stand, we need to know what is there, and how it will be affected by our
actions!
What is DBH? - correct answer ✔•Diameter at breast height or 4.5 off the
ground
What is Total Height? - correct answer ✔Height of the tree of interest from
the base to the top of the canopy
What is Height to Crown Base? - correct answer ✔Height of tree from base
of the stem to base of the crown
What is Crown Ratio? - correct answer ✔•Ratio of crown height to total
height
,What is the most common diameter measurement? - correct answer ✔DBH
(Diameter at breast height)
What is DBH used to calculate? - correct answer ✔stocking, basal area, and
to gauge various competition factors
What does DBH always assume? - correct answer ✔assumes 4.5 off the
ground on the uphill side of the tree
What is D-Tape? - correct answer ✔Diameter tape, used to measure DBH.
Wrapped around the tree, flat against the bark.
Typically record DBH to nearest 10th of an inch
What is the biltmore stick? - correct answer ✔•One of the simplest tools for
measuring DBH
•
•Hold Biltmore Stick against the tree at breast height with it being 25 inches
from your eye, making sure that the side with diameter markings is facing you
•
•Sight past the zero end of the stick and the edge of the tree (line up the zero
edge with the tree edge))
•
•Without moving your head, look at the other tree edge and note the diameter
mark on the stick that lines up with it.
, what is total height? - correct answer ✔•Most important tree height
measurement
•Used in conjunction with DBH to estimate volume
•Used in gauging site quality (site index)
What is a Clinometer? - correct answer ✔•device that measured tree height
based on trigonometric functions
What do you need to know when use a clinometer? - correct answer ✔The
horizontal distance between you and the tree.
What is 1/66 scale? - correct answer ✔•A common distance measurement in
Forestry is 66 ft. - known as a "chain"
•
•A 1/66 scale is a scale in some clinometers already calibrated to 66 ft (1
chain) away from the tree
•
•Using this scale, you can read the tree height directly off the scale, without
having to multiply the scale value times the horizontal distance
What are common mistakes of correction? - correct answer ✔Apparent line
of sight and over estimation.
What is a basal area? - correct answer ✔•Basal are is the cross-sectional
area of a trees trunk at breast height
•
•Basal area is a simple function of diameter
•
•Directly linked to the concept of site occupancy!
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