Ponderosa Pine-Grand Fir Spacing Study in Central Oregon: Results After 10 Years

摘要

The 10-year growth response from an initial spacing study established in a ponderosa pine (Pinus ponderosa) and grand fir (Abies grandis) plantation was measured in central Oregon. The study was designed to compare the growth rates of pure pine, pure fir, and a 50-percent mixture of each species planted at 6-, 12-, and 18-foot spacings. Height growth of pure pine was about twice as great as that of pure fir because of damage to the fir from frost and animals; growth of the pine-fir mixture was intermediate.