CF Forest Resource Measurement and Inventory 3

Question 1

When using the line-intersect method for coarse woody debris, which measurement is recorded for each piece that intersects the transect line?

Accepted Answer

Diameter at the point of intersection

Answer

In the line-intersect method, the diameter of each piece where it crosses the transect line is recorded and used to calculate downed wood volume.

Question 2

Point Relascope Sampling (PRS) extends the variable-radius concept to measure which additional stand attribute beyond basal area?

Accepted Answer

Tree volume and stand density simultaneously using angle counts at multiple heights

Answer

PRS uses angle gauges at multiple heights to simultaneously estimate volume, density, and other stand attributes without traditional plot boundaries.

Question 3

In LiDAR-based forest inventory, 'canopy height model (CHM)' is derived by:

Accepted Answer

Subtracting the digital terrain model from the digital surface model

Answer

CHM = DSM (first returns, representing canopy top) minus DTM (ground surface), yielding vegetation height above ground.

Question 4

Which volume equation form uses diameter at breast height and total height as the only independent variables?

Accepted Answer

Combined variable equation

Answer

Combined variable (or standard) volume equations use both DBH and total height as predictors, contrasting with local tables that use DBH alone.

Question 5

If a 1-acre fixed-radius plot contains 12 trees of 10-inch DBH, what is the trees-per-acre (TPA) expansion factor when plot radius is 1/10 acre?

Accepted Answer

120

Answer

TPA = trees on plot × (1/plot size in acres) = 12 × 10 = 120 TPA because a 1/10-acre plot expands by a factor of 10.

(CF) Certified Forester Exam Practice Test