Tropical Rainforest Flashcards

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1
Q

Where are trf

A

Located 5 degrees north and south of equator

In tropics of cancer and Capricorn

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2
Q

How much carbon do they store

A

550gtc

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3
Q

What % of terrestrial carbon do they store

A

20%

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4
Q

Why do trf have high npp

A

Hot and humid

Decomposition, respiration and photosynthesis all happen fast

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5
Q

What is the largest store

A

Biomass

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6
Q

Why is the litter and soil store so small

A

Litter gets decomposed rapidly due to high temp and humidity
Carbon and nutrients get taken back up by plants very fast due to high biodiversity and number of plants
Convectional rainfall washes out DOC from the soil and litter into the rivers

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7
Q

How is photosynthesis maximised

A

Evergreen plants due to no seasons
Can photosynthesis all the time

And lots of daylight and sun for photosynthesis (12hrs a day)

Warm temperatures (25 degrees)

3000mm precipitation a year

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8
Q

Why does it recurve lots of rain

A

Inter tropical convergence zone

Forcing moist warm air to rise

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9
Q

How much light does the canopy layer absorb

A

70%

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10
Q

How much rain does the canopy lAyer in receipt

A

80%

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11
Q

How much carbon stored in trees alone

A

700 tonnes

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12
Q

How much carbon dioxide does trees absorb

A

2.4bill tonnes

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13
Q

How much CO2 is produced from decomposition

A

1.7 bil tonnes

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14
Q

How do nutrients get put into the soil

A

Rapid nutrient cycle

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15
Q

Why is deforestation bad

A

Decreases photosynthesis
Less c02 taken in from the air
Slash and burn = combustion = releases CO2
Less carbon in the soil = supports less organisms = hard to regrow
Soil = vulnerable to leaching and rain erosion

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16
Q

Why is global warming bad for trees

A

Increases temp
Increase rate of photosynthesis
Increase in glucose
Trees die early

Global warming = drought = lack of rain for photo

17
Q

What is an example of afforestation in the Amazon

A

Paricia

In rondonia

18
Q

Explain the paricia

A

Redevelop 1000km on timber plantation
Government owned land
Previously deforested
20 mill fast growing hardwood seedlings

19
Q

Negative impact of paricia

A

Monoculture = limits biodiversity

Secondary forests aren’t as productive

20
Q

What is the benefit of paricia

A

Increases photosynthesis

Increases carbon sequestration

21
Q

What is the REDD scheme

A

Payment for tribes to protect the trf
Stop logging
Plant native timbers
Market based approach = granting carbon credits to TNCs who exceed annual carbon emission quota

22
Q

Negative on redd scheme

A

Removes traditional way of life for tribes

23
Q

Benefits if redd scheme

A

Reduces carbon emmision into atm
Put large tncs in main stage to tackle global warming
Provides income to indigenous tribes

24
Q

Why is farming bad for trf

A

Over use of soils by the same plant species

Lowers soil fertility

25
Q

What are some improved agriculture techniques

A
Rotational crops 
Dark soils (genetically modified) = high nutrient conc
26
Q

How much does photosynthesis decrease after 10yrs of deforestation

A

From 30.4tonnes/ha to 12.3