Flashcards in Unit 1B - Hot Deserts - Strategies to reduce risk of desertification Deck (11)
4 main strategies for reducing risk of desertification?
Water management, tree planting, soil management, appropriate technology
2 ways water management reduces risk of desertification?
- grow crops that don't need much water to reduce water use
- using drip irrigation on crops than surface irrigation means soil isn't eroded by lots of water added all in one go
3 ways tree planting reduces risk of desertification?
- planted to act as windbreaks to reduce wind erosion
- provide shade for crops which reduces temperature and evaporation rates
- used to stabilise sand top prevent desert from encroaching on farm land
3 ways soil management reduces risk of desertification?
- leaving land to rest in between grazing or planting to let them recover their nutrients
- compost can be added to add extra nutrients
- rotating crops to stop same nutrients being removed
1 way appropriate technology reduces risk of desertification?
- uses cheap, sustainable and easily available materials, easy for local people to maintain
Type of trees planted and where to reduce desertification?
Acacia trees planted (afforestation) and native to Senegal, Sahara
An advantage and disadvantage of planting acacia trees?
+ve - Prevents soil erosion, provides nutrients, removes carbon from atmosphere
-ve - Unreliable rainfall and not all areas may be provided with an education or seeds
Where are stone lines used?
Advantage and disadvantage of using stone lines?
+ve - water is maintained and used, nutrient rich sediment trapped - enable growth and cheap, low skilled, sustainable method
-ve - Labour intensive, unreliable rainfall
Size of Zai planting pits?
25cm deep, 25cm diameter, 90cm apart