Development and growth of even-aged stands of Douglas-fir and grand fir

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Abstract
Stand development patterns and growth rates of even-aged mixed stands of Douglas-fir (Pseudotsuga mensiesii Mirb. Franco) and grand fir (Abies grandis Dougl. Lindl.) were investigated by stand reconstruction in eastern Washington [USA]. Although Douglas-fir dominated the stands early, grand fir of the same age eventually overtook the tallest Douglas-firs. Dominant trees of both species were found to have highly variable taper form (based on basal area to height ratios), although a linear relationship existed in other crown classes. Stem volume growth rates were determined by reconstructing past diameters and heights and were found comparable to site class IV Douglas-fir in western Washington. Intensive management, especially planting and thinning, could improve upon the observed mean annual increments of 800 board feet per acre at 80 years of age.

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