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.
FM Forest Ecology & Silviculture 2
Which silvicultural system is BEST suited for shade-tolerant species that require a multi-layered canopy structure?