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Desertification
 

Desertification

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    Desertification Desertification Presentation Transcript

    • Desert Ecology Desertification
    • • Desertification is the degradation of land in arid, semi-arid, and dry sub-humid areas.• The process of fertile land transforming into desert typically as a result of deforestation, drought or improper/inappropriate agriculture
    • Causes of desertification:1. Ambulatory cultivation2. Overgrazing3. Cutting of trees and perennial plants4. Wrong Agricultural development5. Fires
    • The general phenomena of desertification:1. Deterioration of the pasture environment2. Degradation of cultivated land by rain Land salinity3. Destruction of forests and the removal of woody trees.4. Increasing of the movement and crawling of the sand5. Deterioration of water supply and changing of the pattern of surface leakage
    • Categories of desertification
    • 1. Light Desertification:In this type of desertification, a very slight damage occurs in vegetation cover and soil. This damage does not affect the biological capacity of the environment and can be neglected .
    • 2-Moderate desertification:• A medium degree of damage of vegetation cover occurs and formation of small sand dunes and salinization of the soil which reduces production by 10-25% .
    • 3. Severe Desertification: In this type, spreading of weeds and unwanted shrubs in the pasture at the expense of desirable and wanted species occurs as well as increasing of the erosion activity which affects the vegetation cover and reduces production up to 50%
    • 4. Very severe desertification: In this type of desertification, composition of active naked great sand dunes occurs and formation of many grooves and valleys and the salinization of the soil which leads to soil degradation. It is the most serious type of desertification.