found in tropical and subtropical regions areas with high temps and abundant precipitation climate...
TRANSCRIPT
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OXISOLS
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CHARACTERISTICS
Found in tropical and subtropical regions
Areas with high temps and abundant precipitation
Climate causes high amounts of weathering
Results Soil low in nutrients Bright red/orange color … caused by the Fe
and AL oxides
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ICE FREE LAND AREA
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ICE FREE LAND AREA (CONT)
Oxisols cover 7.5% of the Earth’s ice free land surface.
Primarily in the southern hemisphere Majority in South America Significant amounts of oxisols are also
found in central Africa
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U.S LAND SURFACE
Oxisols are not found in the continental U.S. in any abundance.
Only 0.02% of the U.S. has oxisols
Most oxisols are found in Hawaii. (not the big island)
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OXISOL PROFILE
Very fine texture. High amounts of bioturbation
(lots of animal activity) Ap - shows topsoil with
plowing Bo1- subsoil with organic
material Bo2- subsoil with slightly
different color Oxisols are used for agriculture
when fertilizers are added Provide pineapple and
sugarcane farming Also support grazing and
pasture lands for livestock.
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SOIL SUSTAINABILITY
Picture from Nigeria (corn field)
Crops such as corn are rotated on a yearly basis
Farmlands are then burned to release nutrients back into the soil
After 5-10 years land Is re-established as forest
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OTHER FACTORS
Tropical areas with high elevation (over 1000M) contain more fertile Oxisols than lowlands.
These areas are used for low impact farming of peanuts, pineapple, and bananas.
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CONSLUSION
Oxisols are found in warm wet climates They are generally infertile Highly permeable Very resistant to erosion Their color comes from insoluble Fe and
Al oxides