B.S.F. or B.Sc.F. Bachelor of Science in Forestry Bachelor of Science in Forestry: Soil Science and Forest Health 3

Question 1

Which soil property most directly controls the rate at which water enters the soil surface during a rainfall event?

Accepted Answer

Hydraulic conductivity and infiltration rate

Answer

Hydraulic conductivity and infiltration rate determine how quickly water moves into and through the soil, controlling runoff potential during rain events.

Question 2

Armillaria root disease in conifers spreads primarily through the soil via:

Accepted Answer

Rhizomorphs growing through soil and contacting healthy roots

Answer

Armillaria species produce string-like rhizomorphs (bootlaces) that grow through soil and infect healthy roots through direct contact with colonized stumps or roots.

Question 3

In a forest soil profile, a dense, brittle subsurface layer that restricts root penetration and water movement is called a:

Accepted Answer

Fragipan

Answer

A fragipan is a dense, brittle subsurface horizon that appears cemented when dry but slakes when moist, restricting root and water penetration in forest soils.

Question 4

Foliar nitrogen content in forest trees is a useful indicator of soil nitrogen availability primarily because:

Accepted Answer

Leaf N concentration reflects long-term soil N supply integrated over the growing season

Answer

Foliar N concentration integrates soil nitrogen availability over the growing season since trees allocate nitrogen proportionally to photosynthetic demand relative to supply.

Question 5

Which process is primarily responsible for converting organic nitrogen in forest floor litter to plant-available ammonium?

Accepted Answer

Ammonification (mineralization)

Answer

Ammonification is the microbial decomposition of organic nitrogen compounds (amino acids, proteins) into ammonium (NH4+), the first step making N plant-available.

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Practice Test

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Practice Test

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Bachelor of Science in Forestry: Soil Science and Forest Health 3