What horizon is characterized by forest vegetation?

Study for the Iowa Soil Judging Test. Master soil concepts with interactive questions and detailed explanations. Prepare effectively for your exam!

The horizon that is most commonly associated with forest vegetation is the A horizon. This layer is typically rich in organic matter and nutrients, primarily due to the decomposition of plant material, which contributes to soil fertility. In forested areas, the A horizon can accumulate a significant amount of organic material from fallen leaves, twigs, and other plant debris, which leads to a dark, nutrient-rich layer that is crucial for supporting the growth of trees and other forest vegetation.

The E horizon, in contrast, is characterized by leaching and the loss of minerals and nutrients, which typically occurs in more mature or well-drained soils, rather than supporting vibrant vegetation. The B horizon, known for its accumulation of materials leached from the A and E horizons, often serves as a sublayer that holds various minerals but does not directly indicate the presence of vegetation. Lastly, the C horizon consists of weathered parent material and is often devoid of significant biological activity or organic material, making it the least relevant to forest vegetation.

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