The soil in a forest is called forest soil. It is a type of soil that is found in areas that are dominated by trees and other woody plants. Forest soils are typically rich in organic matter, which is decomposed plant material. This organic matter helps to improve the soil's structure and fertility, and it also provides nutrients for plants. Forest soils also tend to be acidic, which is due to the decomposition of organic matter. The acidity of forest soils can help to prevent the growth of some types of plants, but it is also beneficial for other plants, such as conifers.