21 terms

Amazon, Case study of a tropical forest

Where is the Amazon?
South America
What is the Amazon rainforest?
The world's largest and most diverse rainforest
How many trees?
300 Billion in the Amazon
How many different types of species?
15,000 in the Amazon
How many countries covered by Amazon?
9- Brazil, Peru, Colombia, Venezuela, Ecuador, Bolivia, Guyana, Suriname, French Guiana
How much carbon stored?
Between 80-120 billion tonnes
Increase in above ground biomass each year
Negative feedback loop in Tropical rainforests
Due to rising productivity of forests which leads to the sequestering (trapping) of the increased CO2 concentrations in the atmosphere from human activity
Capacity to absorb in 1990s
two billion tonnes of Carbon
Average discharge of water into Atlantic Ocean
Rio Negro
Tributary of Amazon, 100m deep x 14km wide
Average annual rainfall across Amazon Basin
How much rainfall reaches the sea
Rate of Deforestation per year between 2000-2007
Techniques for the removal of the forest
slash and burn
4 impacts of Slash and burn
1) Reduce retention of humidity in soil's top layer 2) Facilitate sudden evaporation 3) Increase albedo and temperature 4) Reduce soil porosity
Forests emit salts and organic fibres and water when they transpire which act as
Condensation nuclei- assisting in cloud and rain formation
Moisture evaporated from deforested areas form
Shallow cumulous clouds which do not usually produce rain
Of world's freshwater enteriung the oceans goes via the Amazon
of rainfall enters the sea, the rest is caught in a closed system loop of rainfall, storage, evaporation, condensation then rainfall again
Amazonian Soils
Contain 4 to 9 kg/m2 of carbon whilst under pasture it is only 1kg/m2