7.3 biodiversity

biodiversity

The variety of different species of organisms on Earth or within an ecosystem

human activities effect on biodiveristy

land used for housing destroys habitats

pollution kills plants and animals

Land use in ecosystems

building, quarrying, farming and waste

What are peat bogs?

Bogs are acidic and waterlogged areas of land.

how is peat formed

when organic matter is not fully decomposed because of acidic and/or anaerobic conditions in waterlogged soils

What is stored in peat bogs?

Carbon dioxide (CO2) is stored in peat and not released into the atmosphere.

Why are peat bogs often drained?

Peat bogs are often drained for farmland.

What happens when peat is drained?

When peat is drained, it comes into more contact with air, leading to decomposition by microorganisms that respire and release CO2.

deforestation

Destruction of forests

reasons for deforestation

-clear land for farming

-grow crops

problems with deforestation

-increases co2 in atmosphere so global warming

-reduces biodiversity

Eutrophication

A process by which nutrients, particularly phosphorus and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae or cyanobacteria.

eutrophication process

plants die->bacteria multiplies->use up oxygen->fish die

consequences of global warming

rising sea levels

melting ice caps

extinction