What is a significant characteristic of Oxisols?

Oxisols are indeed characterized by their high content of iron and aluminum oxides, which gives them their distinct properties. These tropical and subtropical soils typically develop in humid, warm environments, leading to intensive weathering and leaching processes. During this weathering, minerals get broken down, but iron and aluminum tend to remain, accumulating in the soil profile. This characteristic contributes to their reddish color and a low nutrient-holding capacity, which often requires careful management for agricultural use.

In contrast, Oxisols do not exist in cold climates, do not contain permafrost, and do not have a high organic content, as they are typically low in organic matter due to the warm temperatures promoting rapid decomposition of organic material.