FORESTRY K3 '25 Flashcards

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Clearcut pros, cons, and best fits

Pros: economical, fast, no windthrow risk

Cons: leaves soil exposed to erosion

Best for: even aged shade intolerant stands like lodgepole, aspen

Selection pros, best fits

pros: aesthetic, less risk of windthrow than other partial cuts

best for: shade-tolerant species, areas where recreation or scenic values are important, erosion-sentivie areas like steep slopes or buffer strips

seed tree and shelterwood pros, cons, best for

pros: old trees naturally seed regeneration, some erosion control

cons: windthrow risk, which if realized causes more damage than clearcut

risks of not harvesting a forest

even-aged, overmature, and/or monocultural stands are at risk of fire and disease

what time of year should you perform site preparation

August to march, before planting

Limiting factors in regenerating forests

compacted soils, competition, soil moisture, cold soils

wet soil prep

mounding

dry soil prep

scalping, scarification, disc trenching (creates ditches for water)

wet competition prep

mounding, plowing

dry competition prep

scalping, scarification, mixing, disc trenching

wet compacted prep

mounding, plowing

dry compacted prep

mixing, winged subsoiler, straight ripper

wet nutrient poor prep

mounding

dry nutrient poor prep

mixing in organics, disc trenching (small trench)

wet cold prep

mounding, plowing

dry cold prep

scaling, scarification, mixing, disking to warm lower layers

Scalping

can physically separate seedlings from competing vegetation

mounding

elevated planting sites and warmer microsites

_% alberta forested

60%

forest industry employs

30,000 ppl, provides lumber, plywood, pulp, paper, medicine

% of trees harvested in alberta

less than 1% per year

how do Alberta’s laws ensure Sustainable Forest Management (SFM)?

1) before harvesting, forestry companies must make 200-year forest harvesting plan incorporating all 4 natural resources and indigenous input and get approved by Alberta govt

2) Must harvest in such a way that “mimics the effects of fire” while leaving buffer around rivers, cultural sites

3) for every tree cut, 3 trees must be planted and monitored for 12 years

how to help urban trees survive

• water them for longer than previously

• cut and destroy infested trees

• diversify monocultures

name benefits of urban trees

• help mental and physical health

• reduce strain and costs of infrastructure by reducing stormwater runoff and erosion

• reduce urban heat island

• save on air conditioning and heat