Soil: Problems and Management (AQA A-Level Geography): Flashcards
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Practise the cards
10 cards from this deck
Soil erosion
Soil erosion
Wearing away of topsoil (most fertile layer)
Annual global topsoil loss
Annual global topsoil loss
36 billion tonnes
Water vs wind erosion severity
Water vs wind erosion severity
Water more serious - removes larger amounts rapidly
Saltation (wind erosion)
Saltation (wind erosion)
Primary transport; 0.1-0.5mm particles hop/bounce
Plant cover for wind erosion protection
Plant cover for wind erosion protection
50% cover adequate
Windbreak protection distance
Windbreak protection distance
12 times tree height
Waterlogging
Waterlogging
Pores filled with water not air; anaerobic conditions
Salinisation
Salinisation
Salt accumulation in soil to toxic levels
Salt concentration causing crop problems
Salt concentration causing crop problems
3,000-6,000 ppm
Plough pan
Plough pan
Impermeable compacted layer below plough furrow depth