Unit 4: Forestry - Deforestation
- Created by: rosieevie
- Created on: 31-05-15 19:25
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- Deforestation - rate of removal exceeds regrowth rate
- Types of Deforestation
- Mature forest degraded to young woodland then scrub woodland and then total clearance
- Hard to estimate the rate of deforestation
- Small clearings created - smaller forest areas created
- Hard to estimate the rate of deforestation
- Large scale mechanical clearance - bulldozers, chainsaws and trucks (easily measured)
- Mature forest degraded to young woodland then scrub woodland and then total clearance
- Maximum Sustainable Yield (MSY)
- Taking groups of trees is sustainable as gaps recolonised by succession
- Large forest clearings require active planting - natural recolonisation much slower
- Increasing MSY using agricultural approaches
- Fast growing species
- Control pests predators and tree spacing
- Selective breeding - enhance growth and quality
- Increase nutrient supplies
- Increasing MSY doesn't necessarily broaden environmental sustainability
- Causes
- Commercial logging - timber for industrial processing and export
- Subsistence wood use - used by locals to build houses, furniture or as fuel (LEDCs)
- Cash crops - increased demand for good climate, large land and low cost labour
- Subsistence farming - restricting land use may increase poverty - instead maximise the current land used
- Urban expansion - growing urban areas near or in forests increases demand for food and fuel
- Mineral extraction - access roads (see roads)
- Reservoirs & HEP stations - flood large areas of valuable forests
- Roads - make it easier to reach remote areas and exploit resources
- Types of Deforestation
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