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Productivity Indices for Lodgepole Pine on Pumice Soils

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In central Oregon, an area characterized by immature or weakly developed soils, productivity for lodgepole pine could not be delineated by soil series alone. Significant differences were recognizable within one soil series (Lapine) on the basis of the total thickness of the pumice mantle and the combined thickness of the A and AC horizons. Stratifying stands on the basis of understory plant communities provided a better indication of productivity than did stratification on the basis of soil characteristics when basal area, site index, and volume increment data were used as measures of productivity. Several plant communities could be combined for site evaluation purposes. Since growth rates for ponderosa pine and lodgepole pine are similar, these findings may be used to evaluate productivity for ponderosa pine where it is not restricted by poor drainage or low temperature.
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Document Type: Journal Article

Affiliations: Project Leader, Silviculture, Pacific Northwest Forest and Range Exp. Sta., Bend, Ore.

Publication date: 01 February 1970

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