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Oxisols

Oxisols. 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 . cHARacteristics. Ice free land area.

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Oxisols

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  1. Oxisols

  2. 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 cHARacteristics

  3. Ice free land area

  4. 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 Ice free land area (cont)

  5. 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) U.S Land surface

  6. 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.

  7. 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

  8. 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.

  9. 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 conslusion

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