The three main components of agroforestry - animals, crops and trees - can be combined in numerous spatial and temporal arrangements and for different functions, creating thus many different kinds of systems. The definitions for the systems described below are taken from P.K. Ramachandran Nair’s "An introduction to agroforestry." The author, co-founder of the World Agroforestry Centre (ICRAF) in 1993, is a pioneer in the establishment modern agroforestry.
Agrisilvicultural systems (trees combined with crops)
Silvopastoral systems (trees and pastures or animals)
Agrosilvopastoral systems (animals, trees and crops)