Desertification
- Created by: Tharv
- Created on: 11-11-18 12:47
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- Desertification
- Degradation of land
- Becomes drier and less productive.
- 1/3 Earth's land- risk of desertification
- Becomes drier and less productive.
- Soil erosion
- Exposed soil- easily removed by wind or water.
- Nutrients in the soil
- Fallen Leaves and dead plants
- Are lost- Soil becomes unproductive
- Soon- ground becomes sandy, dusty stoney.
- Nutrients in the soil
- Exposed soil- easily removed by wind or water.
- Main Causes of Desertification
- Climate Change
- Rainfall
- Expected to reduce rainfall in current dry areas.
- Less rainfall= less water for plants to grow= Plants die.
- Roots hold soil together, plants die= Soil is easily eroded
- Expected to reduce rainfall in current dry areas.
- Temperatures
- Expected to rise.
- Higher Temps.= More evaporation
- Makes soil drier- plants die- roots no longer hold soil together.
- Higher Temps.= More evaporation
- Expected to rise.
- Rainfall
- Human Activities.
- Population Growth.
- Puts pressure on land
- More Deforestation, Overgrazing and Over-cultivation
- Puts pressure on land
- Removal of Fuel wood
- People who live in dry areas rely on wood for fuel for cooking.
- Removal of tree leaves- soil is exposed- more easily eroded
- People who live in dry areas rely on wood for fuel for cooking.
- Population Growth.
- Climate Change
- Reducing risk of desertification
- Water Management
- Growing crops that don't need much water- reduces water use.
- Using drip irrigation on crops
- Means soil isn't eroded by lots of water being added in one go.
- Using drip irrigation on crops
- Growing crops that don't need much water- reduces water use.
- Tree Planting
- Trees act as winder breaks for the soil to protect against Wind erosion.
- Stabilise the sand to prevent he desert from encroaching on farm land.
- Growing trees in amongst crops- protects crops (and soil)
- Provides shade-reducing temperatures and evaporation rates.
- Water Management
- Degradation of land
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