The surface litter layer in these soils is thin due to rapid decomposition . In Europe and Asia some grasslands are called Steppes. In South America, grasslands are known as Pampas. This particular species dominated much of the tall grass prairie forming dense covers 1.5 to 2.0 meters tall. Flowering herbs , including many kinds of composites and legumes , are common but much less important than grass species.
Trees are limited to low lying areas and the narrow zone immediately adjacent to streams.
Natural grassland ecosystems are dominated by various species of grass. Much of the prairies is now cultivated to grow grain crops. In the tall grass prairie organic rich and black chernozemic soils are common. Chernozems are among the richest in nutrients and consequently the most fertile in the world. Drier parts of prairies, soils can be influenced by salinization .