B.F. Bachelor of Forestry Bachelor of Forestry Forest Mensuration 4

Question 1

The 'site index' of a forest stand is most commonly defined using which reference age?

Accepted Answer

50 years

Answer

Site index is most commonly expressed as the expected height of dominant and codominant trees at a base age of 50 years for many species.

Question 2

What does the term 'merchantable height' refer to in timber measurement?

Accepted Answer

The height of the usable stem from the stump to a minimum top diameter

Answer

Merchantable height is the length of trunk from the stump to a specified minimum top diameter (e.g., 4 inches) that yields usable timber.

Question 3

Which of the following is a major advantage of using point sampling (variable plot) over fixed-area plot sampling?

Accepted Answer

Larger trees are sampled with higher probability, reducing variance in volume estimates

Answer

Point sampling gives larger trees a higher probability of selection, which reduces estimation variance for volume since large trees contribute most to stand volume.

Question 4

The 'quadratic mean diameter' (QMD) of a stand is calculated as:

Accepted Answer

The square root of the average of squared diameters

Answer

QMD is the diameter of a tree of average basal area, computed as the square root of the mean of all individual tree diameters squared.

Question 5

Which log rule is considered the most accurate and is often used as a standard for comparison?

Accepted Answer

International ¼-inch rule

Answer

The International ¼-inch rule is widely regarded as the most accurate log rule because it accounts for saw kerf and taper using a formula derived from actual milling studies.

B.F. Bachelor of Forestry Practice Test

B.F. Bachelor of Forestry Practice Test

B.F. Bachelor of Forestry Bachelor of Forestry Forest Mensuration 4