forests Flashcards

1
Q

what is a forest (cirteria)

A

land spaning more than 0.5 ha
tree canopy that covers more than 10% of a given area
trees growing more than 5 m

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2
Q

how much of can is forest

A

aprpox 30%

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3
Q

what is the role for forests

A

they act hs carbon skins as they draw more CO@ from the atmos than the emmit
they are a significant economy contributor in both timber and non timber products

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4
Q

how much of the worlds forest is in can

A

9%

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5
Q

what has been the general trend in canadas forest abundance

A

a slight decrease, likely due to the increased range of forest fires and disturbances cause by insects and forestry

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6
Q

what is the leading cause of deforestation in can

A

1) agriculutre
2) oil and gas

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7
Q

what is a carbon sink

A

a entity that absorbs more carbon than it emits (carbon sequestration)

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8
Q

what is a carbon source

A

an entity that realeases more carbon than it absorbs

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9
Q

what is the general trend of CO2 emitted from CANs forests of the past few years. what is causing this?

A

an increase in CO@ emissions, behaving more like a source than a sink

this is in part by the increased ecosystem disturbance by insects. it is also influenced by the amount of area burned in a given year, but that has a much smaller impact

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10
Q

how are canadas forests owned/distributed?

A

77% by provincial
16% by federal
7% by private land owners

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11
Q

what is the AAC

A

the annual allowable amount of timber that can be harvested in a given area on a sustainable basis. it will measure coniferous and deciduous amounts separately

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12
Q

what are the main threats to forestry in CAN?

A

climate change
insect infestations
fires
diseases
theft
deforestation

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13
Q

how does climate impact forests

A

with a warming climate, species that rely on colder temp are migrating northwards.
further, warmer climate increase the regions of which insects and infections are able to thrive.

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14
Q

how do insect infestations impact forest

A

invasive beetles and insects will attack healthy trees, overriding their natural immune system and kill the tree. they also have a tendency to migrate and infaect may related trees.

dead trees are more suseptable to catching on fire

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15
Q

how much of BCs forests have been impacted by the lodge pole pine beetle? when are their population abundance at its highest?

A

50%and their population increases with warming weather patterns in spring and summer

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16
Q

how do forest fires impact forestry

A

the burning of forests increase CO2 emissions.

while the number of fires have stayed the same, the total area burned each year is increasing on average and more are being caused by lightning and less my human activity

17
Q

how do diseases impact forestry

A

native diseases are important for the normal healthy disruption to an ecosystem. this allows for regrowth (by removing old trees) and resiliancy of the ecosystem.

18
Q

what is tree poaching

A

the unlawful removal of irreplacble items.

tree poaching negatively impact the economy as approx 1 bill $ are lost on an annual basis

19
Q

what do forests provide to humans?

A

an economy source

a carbon sink

recreation areas
- contributes to biodiversity and effect water cycling by retaining groundwater

assist in decomposition of natural materials

20
Q

what are non timber forest prodcuts

A

materials or produced sourced from the forest that do not required the cutting down of trees

mushrooms
maple syrup
seeds and nuts
furs
medicines

21
Q

how much money do non timber products contribute each year

A

1 bill