Oxisols are a soil order in USDA soil taxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator. In the World Reference Base for Soil Resources (WRB), [1] they belong mainly to the ferralsols, but some are plinthosols or nitisols.

Oxisols are characterized by a thick subsurface layer (the oxic horizon) that contains kaolin -group clay minerals and metal oxides in a finely textured matrix with very little or no easily weathered silicates.

Oxisols (from French oxide, "oxide") are very highly weathered soils that are found primarily in the intertropical regions of the world. These soils contain few weatherable minerals and are often rich in Fe and Al oxide minerals.

The central concept of Oxisols is that of soils of the tropical and subtropical regions. They have gentle slopes on surfaces of great age. They are mixtures of quartz, kaolin, free oxides, and organic matter. For the most part they are nearly featureless soils …

Highly Weathered Tropical Soils (Oxisol) Typical Characteristics. Climate: Oxisols are the most highly weathered soil order. These soils form under year-round hot, tropical climates. Although climatic pattern may have changed over the course of …

Oxisols are the most weathered of the 12 soil orders in the USDA soil classification system. (See Lesson 2 -- Processes of Weathering.) They are composed of the most highly weathered tropical and subtropical soils, and are formed in hot, humid climates that receive a lot of rainfall. Oxisols are located primarily in equatorial regions.

Oxisols are reddish, yellowish, or grayish soils. They are most common on the gently undulating surfaces of geologically old surfaces in tropical and subtropical regions where they occupy approximately 11.8 million km2. Oxisol profiles are distinctive …

2024年5月24日 · Oxisol soil is found in warm, rainy climates under broadleaf, evergreen vegetation like that found in the rain forest. Chemical weathering (especially oxidation) in the presence of warm temperatures combined with heavy rainfall creates a soil rich in iron and aluminum oxides called "sesquioxides".

Looking for Oxisol? Find out information about Oxisol. A soil order characterized by residual accumulations of inactive clays, free oxides, kaolin, and quartz; mostly tropical.

Amber examining an Oxisol in Southern Ghana Photo Credit: Andrew Manu. Click to enlarge. Deeply weathered and dominated by iron and other resistant minerals, these soils are only found in the most weathered conditions on Earth-near the tropics where warm and wet conditions dominate along with long-term stability in the soil surface.