Forest Ecology and Silviculture Flashcards

Which silvicultural system is most appropriate for shade-intolerant species like aspen and jack pine?

Answer: Clearcut system

Clearcut systems regenerate shade-intolerant species by providing full sunlight to the entire site.

What is the term for the process by which nitrogen-fixing bacteria convert atmospheric nitrogen to a plant-available form?

Answer: Biological nitrogen fixation

Biological nitrogen fixation converts N₂ gas into ammonia through bacteria such as Rhizobium and Frankia.

In forest succession, what is the term for the gradual replacement of one plant community by another over time?

Answer: Forest succession

Forest succession describes the sequential replacement of plant communities from pioneer species to climax vegetation.

Which of the following best describes a 'mast year' in forest ecology?

Answer: A year of synchronous heavy seed production by trees

A mast year is characterized by synchronous, exceptionally heavy seed or nut production across a tree population, often in response to climate cues.

Which stand structure characteristic is most associated with uneven-aged management?

Answer: Multiple age and size classes present simultaneously

Uneven-aged management produces stands with multiple age and size classes coexisting at the same time.

What forest floor layer is primarily composed of partially decomposed organic matter that retains its original structure?

Answer: O horizon (Oe/F layer)

The Oe (fermentation) layer consists of partially decomposed organic matter where original structure is still recognizable.

In the shelterwood silvicultural system, what is the primary purpose of the seed cut?

Answer: Create seed sources and favorable microclimate for regeneration

The seed cut retains a portion of the overstory to provide seed sources and modify microclimate conditions favorable for natural regeneration.