FM Forest Ecology & Silviculture 2 — Questions and Answers
Question 1: Which silvicultural system is BEST suited for shade-tolerant species that require a multi-layered canopy structure?
- Clearcutting
- Selection system (Correct answer)
- Shelterwood system
- Seed-tree system
Correct answer: Selection system
The selection system maintains an uneven-aged stand structure ideal for shade-tolerant species like sugar maple and hemlock that regenerate under canopy cover.
Question 2: What is the primary ecological role of snags (standing dead trees) in forest ecosystems?
- Increasing fire risk only
- Providing habitat for cavity-nesting wildlife (Correct answer)
- Competing with live trees for nutrients
- Releasing carbon faster than downed logs
Correct answer: Providing habitat for cavity-nesting wildlife
Snags are critical habitat structures providing nesting and roosting sites for woodpeckers, owls, bats, and many other cavity-dependent species.
Question 3: The concept of 'gap dynamics' in forest ecology refers to:
- Spacing between planted seedlings
- Regeneration processes triggered by canopy openings (Correct answer)
- Gaps in wildlife corridors
- Spaces left by selective logging
Correct answer: Regeneration processes triggered by canopy openings
Gap dynamics describes how small openings created by tree death initiate regeneration cycles, driving much of the structural diversity in natural forests.
Question 4: Which nutrient cycle is most likely to be disrupted by a stand-replacing wildfire in a Douglas-fir forest?
- Carbon cycle only
- Nitrogen cycle, due to volatilization (Correct answer)
- Phosphorus cycle, due to leaching
- Sulfur cycle, due to atmospheric loss
Correct answer: Nitrogen cycle, due to volatilization
Intense fire volatilizes nitrogen compounds, causing significant losses that can limit forest productivity for years post-fire.
Question 5: A forester observes heavy elk browse pressure preventing conifer regeneration in a clearcut. This is an example of:
- Allelopathy
- Intraspecific competition
- Biotic interference with regeneration (Correct answer)
- Abiotic site limitation
Correct answer: Biotic interference with regeneration
Heavy ungulate browse is a biotic (living organism) factor that can suppress or eliminate tree regeneration after harvest.
Question 6: In forest succession, which term describes the community of species that can persist indefinitely under current environmental conditions?
- Pioneer community
- Seral community
- Climax community (Correct answer)
- Edge community
Correct answer: Climax community
The climax community represents the theoretical endpoint of succession where the dominant species can reproduce under their own canopy and maintain dominance over time.
Question 7: What does the term 'rotation age' mean in even-aged silviculture?
- Age when trees begin cone production
- Age when timber basal area peaks
- Planned age at which a stand will be harvested (Correct answer)
- Age of the oldest residual tree after thinning
Correct answer: Planned age at which a stand will be harvested
Rotation age is the planned period between stand establishment and final harvest, chosen based on management objectives such as maximum volume, value, or financial return.
