Soil Degradation & Management . Tasks What is soil? (260) The importance of time in soil formation?...
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Transcript of Soil Degradation & Management . Tasks What is soil? (260) The importance of time in soil formation?...
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Soil Degradation & Management
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Tasks
• What is soil? (260)• The importance of time in soil
formation?• What are leaching & salinisation?• What is alluvium?• What are: pastoral & arable farming?
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Soil degradation
• What is soil degradation?• Causes of soil degradation including
examples – deforestation (where, why, effect)– overgrazing (where, why, effect)– Monocultures (what & why, examples,
problems)– Irrigation & salinisation.
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Consequences of degradation• Loss of fertility ↑ pressure on the land
over-use of land depletion of nutrients ↑ need for fertilisers:– ↑ costs for farming ↑ food prices.– environmental impact leaching into water
supplies health issues & unintended impacts (eutrophication).
• Loss of farmland ↑ land prices in fertile areas & depletion of food supply ↑ food prices ↑ % of income spent on food (especially poor) trapped in poverty & reliance on aid.
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• Degradation of soil ↓ in farming in that area less rural jobs rural-urban migration & associated problems.
• Loss of vegetation rapid soil erosion & unstable slopes landslides & problems of deposition of material elsewhere
• Loss of productivity of land in LEDCs often leads to ↓ in dietary variety malnutrition & possibly starvation.
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Tasks• Short notes about soil management:
– Afforestation.– Crop rotation.– Draw a diagram & label it to explain how
terraces protect the soil.– Organic material.– Strip farming.– Stone lines.
• Case study: china – issues p.280 & solution p.283.