FM FM Forest Measurements & Inventory

Question 1

Diameter at Breast Height (DBH) is the standard measurement of tree diameter taken at:

Accepted Answer

4.5 feet (1.37 meters) above ground on the uphill side of the tree

Answer

Ground level at the base of the tree

Answer

The base of the live crown

Answer

The midpoint of the merchantable stem

Question 2

What instrument is most commonly used to measure tree DBH in forest inventory?

Accepted Answer

Diameter tape or calipers

Answer

Clinometer

Answer

Hypsometer

Answer

Prism or wedge

Question 3

In a prism or wedge cruising system, a tree is counted in the plot when:

Accepted Answer

Its image in the prism appears to overlap with the actual tree trunk

Answer

It is larger than a minimum DBH threshold

Answer

It falls within a fixed radius from the plot center

Answer

It is taller than the cruiser's eye level

Question 4

The term 'basal area' in forest mensuration refers to:

Accepted Answer

The cross-sectional area of a tree stem or all stems per unit area, typically expressed in square feet per acre

Answer

The total surface area of tree bark per acre

Answer

The area of soil disturbed at a tree's base

Answer

The total leaf area of a forest canopy

Question 5

A 'site index' in forest management is used to:

Accepted Answer

Measure forest site productivity based on the height of dominant trees at a base age

Answer

Rank forest land by property tax value

Answer

Estimate the number of trees per acre

Answer

Calculate the slope percentage of a harvest area

Question 6

Which of the following sampling methods uses plots of fixed size and shape to estimate forest conditions?

Accepted Answer

Fixed-area plot sampling

Answer

Variable-radius plot sampling

Answer

Point sampling

Answer

Line-intercept sampling