B.F. Bachelor of Forestry Silviculture 2 — Questions and Answers
Question 1: What is the main objective of 'thinning' in silviculture?
- To remove all small trees to reduce competition with shrubs
- To reduce stand density and concentrate growth on the best remaining trees (Correct answer)
- To clearcut a portion of the stand for revenue
- To introduce new species into a monoculture
Correct answer: To reduce stand density and concentrate growth on the best remaining trees
Thinning reduces tree density to redistribute growth potential to the most vigorous, well-formed trees and improve overall stand health and timber quality.
Question 2: Which silvicultural term describes the removal of undesirable vegetation to reduce competition with planted or natural seedlings?
- Release cutting (Correct answer)
- Improvement cutting
- Seed-tree cut
- Regeneration harvest
Correct answer: Release cutting
Release cutting frees established seedlings or saplings from overtopping or surrounding competition so they can access light, water, and nutrients.
Question 3: The seed-tree silvicultural method retains a small number of trees after harvest primarily to:
- Provide shade for new seedlings
- Serve as a seed source for natural regeneration (Correct answer)
- Protect soil from erosion indefinitely
- Supply habitat for old-growth dependent species
Correct answer: Serve as a seed source for natural regeneration
In the seed-tree method, a few scattered trees are left standing after harvest to disperse seed across the cutover area for natural regeneration.
Question 4: What is 'stocking' as a silvicultural concept?
- The process of planting seedlings in a nursery
- The number or basal area of trees per unit area relative to a desired level (Correct answer)
- The total volume of timber harvested per acre
- The proportion of shade-tolerant versus intolerant species
Correct answer: The number or basal area of trees per unit area relative to a desired level
Stocking refers to the actual number, basal area, or volume of trees on a site compared to a desired or optimal level for the management objective.
Question 5: Which of the following tree species is considered highly shade-intolerant?
- Sugar maple (Acer saccharum)
- Eastern hemlock (Tsuga canadensis)
- Lodgepole pine (Pinus contorta) (Correct answer)
- American beech (Fagus grandifolia)
Correct answer: Lodgepole pine (Pinus contorta)
Lodgepole pine is shade-intolerant and requires full sunlight for regeneration, making it well-suited to clearcut silvicultural systems.
Question 6: What is 'rotation age' in silviculture?
- The age at which a species loses its ability to reproduce
- The planned age or size at which a stand is considered ready for final harvest (Correct answer)
- The number of years between prescribed burns
- The time required to complete a single thinning cycle
Correct answer: The planned age or size at which a stand is considered ready for final harvest
Rotation age is the planned interval from stand establishment to final harvest, determined by management goals such as timber volume, financial return, or wildlife habitat.
B.F. Bachelor of Forestry Silviculture 2
What is the main objective of 'thinning' in silviculture?