Understory Herbage Production as a Function of Rocky Mountain Aspen Stand Density

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Abstract
The effects of aspen overstory basal area on herbaceous understory production on the Bears Ears District of the Routt National Forest in northwest Colorado [USA] were investigated. Using regression, a coefficient of determination of 0.61 was found between herbage production and overstory basal area. For overstory basal areas < 10.0 m2/ha, herbaceous understory production varied considerably and was often double that found at higher densities of overstory basal areas. Herbage production at higher densities (10.0-18.9 m2/ha) showed less variation with an average production of 1100 g/ha. The best opportunities for herbaceous understory production [for grazing] in unmanaged, pure aspen stands occur at overstory basal areas < 10.0 m2/ha.

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