The type of ecosystem commonly found in the Appalachian Mountains is Temperate deciduous forest.

This ecosystem is characterized by a variety of tree species that lose their leaves in the fall, including oak, maple, hickory, and birch. The temperate deciduous forest of the Appalachians supports rich biodiversity, providing habitat for numerous wildlife species, including deer, black bears, and a variety of bird species. The region experiences distinct seasonal changes, with vibrant foliage in the autumn and a lush undergrowth in the spring and summer. The diverse plant life and varying elevations contribute to the ecological richness of the Appalachian Mountains.