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Effects of Salinisation (Categories of salinity (Secondary salinity (Human…
Effects of Salinisation
Categories of salinity
Primary salinity
Result of natural processes
Low rainfall
High evaporation
Secondary salinity
Human land use
Alter salt balances of soil & water
Dryland salinity
Mass vegetation clearing
Irrigation salinity
Excessive watering of crop & pastures
Excessive use of land for farming and irrigated agriculture
major cause of
secondary salinity
loss in vegetation
less trees to absorb water
seep into ground
water table rise
bring salts found in deeper layer of Earth out
Excessive use of water for irrigation
water absorbs excess salt in topsoil
drains back to river