Tree Species

- Aspen

- Balsam Fir


Site Conditions

Range of quaking aspenAspen grows on a wide range of soils from shallow and rocky to deep loamy sands and heavy clay. Good soils are well-drained, loamy, and high in organic matter, calcium, magnesium, potassium, and nitrogen. The best sites have soils with silt-plus-clay content of 80 percent or more. Aspen prefers a water table from 2 to 8.2 feet deep. It grows poorly on sandy or droughty soils and on heavy clay.

Site index commonly is used to evaluate site productivity when aspen stands are at least 20 years old and have not been damaged by fire or overtopped by other species (Appendix B-1: Site index curves for quaking aspen). Manage aspen for timber only where the site index is 60 or better.