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Dark Colored, Acid, Forest Soils of Western Oregon¹

ABSTRACT

Very acid, strongly leached soils of the Cascade and Coast Ranges of Oregon have been called Brown Latosols, Yellowish Brown Lateritic soils, and Sols Bruns Acides. These soils are in an area of relatively high precipitation and relatively uniform temperatures under coniferous forest and dense understory vegetation. The A horizons are dark colored and have strong granular or subangular blocky structure. The B horizons are commonly dark yellowish brown and have weak or moderate subangular blocky structure. The clay content increases from A to B in some cases, but clay skins are not evident in thin sections. These soils are high in organic carbon, low in bulk density, and low in base saturation. They are Haplumbrepts according to the 7th Approximation.

¹ Joint contribution of Oregon Agr. Exp. Sta., Oregon State University, Corvallis (technical paper 1963), Forest Service, USDA, and Soil Conservation Service, USDA.

² Prof. of Soils; Soil Scientist, Forest Service Region 6, Portland, Ore.; and Soil Scientist, Soil Conservation Service, USDA.

Received for publication April 21, 1965. Accepted for publication August 25, 1965.