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Geography 2 > Peatlands > Flashcards

Peatlands Flashcards

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1
Q

Why do peatlands need a high water table

A

Water logs the soil
Creates anaerobic conditions
Decomposers can’t decompose organic matter

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2
Q

Is it a sink or source

A

Sink

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3
Q

What does microbial respiration produce

A

CH4

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4
Q

How does water enter the peatlands

A

Frontal rain

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5
Q

How is water lost from the peatlands

A

Évapotranspiration

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6
Q

How is a high water table created

A 
Flat land 
Impermeable rock (gritstone)
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7
Q

What is a carbon sink

A

The rate of atmospheric carbon being fixed is much higher than it being released into the atm

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8
Q

How much area does peatland cover in wales

A

5%

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9
Q

What % do peatlands contribute to Wales’s carbon store

A

30%

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10
Q

How much do peatlands store globally

A

250gt

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11
Q

How is carbon lost from peatlands

A

Dissolved organic carbon
Weathering
Particulate organic carbon

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12
Q

How much of Peat is carbon

A

50%

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13
Q

What bacteria decomposes peat

A

Méthanotrophic

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14
Q

How deep is peat in the uk

A

4m

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15
Q

What organisms live in peatlands

A

Sphagnum Moss
Red grouse
Heather

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16
Q

How does the water cycle maintain a carbon sink in the peatlands

A

Precipitation> surface run off and évapotranspiration = high water table and water logged

17
Q

How does the carbon cycle maintain the carbon sink in the peatlands

A

Photosynthesis>respiration (bacteria and plants) doc and poc > decomposition

18
Q

Why is peat extracted

A

Good fuel source
Ireland has 2 peat powered stations
Added to soil in garden centres

19
Q

Why are peat bogs drained

A

Agriculture

20
Q

How does peat get eroded

A

Air pollution from Sheffield and Manchester
Vegetation died
Exposing bare peat
Surface run off rapidly erodes peat
Forming gullies
Water table lowers and water drains into gullies

21
Q

How much of the uks peat is damaged

A

80%

22
Q

What does a loss of 5% uks peatland equate to

A

UKs Annual c emissions

23
Q

How are peatlands restored

A 
1. Re vegetation 
Stabilises peat 
Less vulnerable to surface run off erosion 
Raises water table 
Slows flow of water over the land
  1. Dams
    Blocks gullies
    Slow flor of surface run off overland flow
    Trap sediment for revegetation
    Trap water to create anaerobic conditions
24
Q

Where was revegetation successul

A

Bleak low south

25
Q

How much of gully blocking showed signs of being revegetated

A

94%

Geography 2 (7 decks)

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