What do you call the layer of moss and decomposing organic matter at the base of trees in the boreal forest?

Question

Quizplus · Accepted Answer

The layer of moss and decomposing organic matter at the base of trees in the boreal forest is called duff. Duff is an important part of the forest ecosystem as it serves as a nutrient-rich layer that helps trees and other vegetation to grow. Ash refers to the residue left behind after the burning of wood or other organic matter, topsoil is the uppermost layer of soil in which plants can grow, and slash refers to the debris left behind after logging operations.

What Do You Call the Layer of Moss and Decomposing