Abstract
Pairs of Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) and Douglas-fir and red alder ( Alnus rubra Bong.) stands were examined at four locations for patterns in average tree size as a function of stand density. On fertile sites, the mixed stands experienced higher mortality than the pure conifer stands. On infertile sites, the pure conifer stands were well below the maximum tree size and density relationship compared to fertiel sites or mixed stands, suggesting under-utilized site resources were available for nitrogen-fixing alder. Planting trials which vary relative densities of these species across plants in site fertility are needed for a clear assessment of the benefits to be derived from species mixtures.
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