Reforestation Flashcards
When is artificial generation used?
Rapid regen, stand conversions or genetic enhancement.
What is drag scarification?
A method of exposing mineral soil and evenly dispersing pl seed in the soil. Enhances natural regen.
What are the common regen methods?
Natural
Coppice
Advanced regen (using trees in understory)
What are typical seed considerations?
- Species and quality including advanced regeneration, genetic material
- Seed source (coppice)
- Species’ periodicity
- Dissemination and coverage
- Species’ seed production capacity
- Germination potential – germination rate
- Damage due to rodents and disease – germination and post germination
Why is natural regeneration considered a risk?
Generally, natural regeneration, although less costly, tends
to be erratic, protracted, inconsistent with our legal
requirements obligations and AAC commitments.
Much more complicated to time and plan
What are the pros and cons of artificial regen?
- More predictable
- Timely
- Flexible
- control over genetics, species and density
How does gov’t subsidize reforestation of crown land?
An appropriate reduction in stumpage depending on which region you are in.
What percent of the harvested area in BC in reforested via Artificial regen? What about Nat?
80% is planted, 20% Nat.
50% of all species produced are from genetically improved seed.
What are legal licensee responsibilities in reforestation ?
Seed procurement (class “A” seed with GG >5% when available)
Growing the seedlings
Planting the seedlings
Site preparation, as required
Getting them to “free growing” regardless of regeneration method
What is a scion?
A cutting from a tree to be used for breeding
3 methods of artificial regen?
Direct seeding
planting seedlings
steckles (cuttings)
What is the importance of the seed?
The seed is the medium through which the genes are carried…
The species survives through the production and dissemination of seed In biological terms, the sole purpose of the tree is then to produce seed and perpetuate the species.
Where is the greatest genetic variation in a species?
Individuals of a species have the most genetic variability. Maintaining genetic variability is crucial to producing good stock into the future.
One tree can recieve pollen from many. The offspring inherit all of that variability.
What tree species has the greatest genetic diversity?
Douglas fir. Most conifers have great gene diversity, with the exception of red pine.
Explain genetic diversity
In a nutshell genetic diversity summarizes how different a tree in a species in one area are when compared to another area. Douglas fir for instance on the coast, are much different from the ones in the interior.
