What soil type is associated with grasslands in sub humid to semiarid climates?

The soil type associated with grasslands in sub humid to semiarid climates is Mollisols. This classification of soil is characterized by a dark, organic-rich surface layer, which makes it highly fertile and suitable for supporting a variety of plant life, particularly grasses that dominate in grassland ecosystems. Mollisols typically develop under grasslands due to the accumulation of organic matter from the decaying roots and shoots of grasses, coupled with adequate moisture conditions that promote the breakdown of minerals and nutrient availability.

These soils can be found in regions where the climate supports grassland vegetation, typically exhibiting less rainfall than regions that would evolve into forested areas, thus creating an environment conducive to the development of Mollisols. They are known for their high nutrient content, making them ideal for agricultural activities, particularly in regions known as the "Great Plains" in North America, where these soil types are prominent.