Unit 4: Agriculture - Environmental Impacts
- Created by: rosieevie
- Created on: 18-05-15 21:07
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- Environmental Impacts
- Habitat Destruction
- Introduced species e.g. crops and livestock
- Removed species e.g. competitors or pests
- Some species encouraged e.g. indigenous predators, pollinators
- Some species tolerated e.g. non-damaging wildlife
- Some species colonise because of favourable conditions e.g. wildflowers
- Introduced Species
- Introduced Pests
- Crop or livestock species that have colonised surrounding area and become pests
- Some species accidentally introduced
- Biological Control Species - may become pests themselves e.g. cane toad
- Introduced Pests
- Pollution
- Fertilisers - leached off into water and cause eutrophication deoxygenation and the release of NOx gases
- Pesticides - may be toxic or can bioaccum or magnify in food chains
- Methane - livestock farming and rice padi fields release lots of CH4
- Energy inputs - for machinery, agrochemical manufacture, transport and food processing and storage
- Changes in Hydrological Cycle
- Reduced evapo transpiration - changes rainfall in areas downwind
- Increased runoff due to reduced vegetation and soil compaction using machinery - increased soil erosion and water loss
- Over abstraction of rivers reduces flow downstream
- Over abstraction of aquifers causes lowered water table - springs and rivers dry up
- Habitat Destruction
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