LOCATION BOSLAND                 OR+CA

Established Series
Rev. MHF/RTS/RWL/ET/RLM
03/2015

BOSLAND SERIES


The Bosland series consists of moderately deep, well drained soils that formed in colluvium and residuum derived from metasedimentary or metavolcanic rock types. Bosland soils are on broad ridgetops and side slopes of coastal hills and mountains. Slopes are 0 to 90 percent. The mean annual precipitation is about 2800 millimeters (110 inches) and mean annual temperature is about 12 degrees C (54 degrees F).

TAXONOMIC CLASS: Fine-loamy, isotic, isomesic Typic Humudepts

TYPICAL PEDON: Bosland silt loam, woodland, on a 62 percent west facing slope at an elevation of 152 meters (500 feet). (When described on August 14, 1985, the soil profile was moist throughout. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 3 centimeters (0 to 1 inch); partially decomposed needles, twigs, and woody materials, moderately acid (pH 6.0).

A1--3 to 13 centimeters (1 to 5 inches); dark brown (7.5YR 3/2) silt loam, brown (7.5YR 5/2) dry; strong fine granular structure; slightly hard, friable, nonsticky and slightly plastic; many fine and very fine roots; many fine and very fine irregular pores; 5 percent gravel; very strongly acid (pH 5.0); clear smooth boundary.

A2--13 to 31 centimeters (5 to 12 inches); dark brown (7.5YR 3/3) silt loam, brown (7.5YR 5/4) dry; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many fine and very fine continuous tubular pores; 5 percent gravel; very strongly acid (pH 4.8); clear smooth boundary. (Combined thickness of the A horizon ranges from 15 to 28 centimeters)

Bw1--31 to 51 centimeters (12 to 20 inches); reddish brown (5YR 4/3) silty clay loam, light reddish brown (5YR 6/4) dry; moderate very fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and very fine roots; many fine and very fine continuous tubular pores; few thin organic coatings in pores; 5 percent gravel; very strongly acid (pH 4.8); clear smooth boundary.

Bw2--51 to 69 centimeters (20 to 27 inches); yellowish red (5YR 4/6) silty clay loam, reddish yellow (5YR 6/6) dry; weak very fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine and very fine roots; many fine and very fine continuous tubular pores; few thin organic coatings in pores; 5 percent gravel; very strongly acid (pH 4.8); clear wavy boundary. (Combined thickness of the Bw horizon ranges from 23 to 74 centimeters)

C--69 to 100 centimeters (27 to 40 inches); brown (7.5YR 5/4) gravelly silty clay loam, light brown (7.5YR 6/4) dry; massive; hard, firm, moderately sticky and moderately plastic; few fine roots; many fine and very fine continuous tubular pores; 20 percent gravel; very strongly acid (pH 4.6); abrupt wavy boundary. (0 to 38 centimeters thick)

R--100 centimeters (40 inches); fractured sandstone.

TYPE LOCATION: Curry County, Oregon; located about 530 feet north and 518 meters west of the southeast corner of section 4, T. 41 S., R. 13 W. W.M.(Latitude 42 degrees, 03 minutes, 03 seconds N, Longitude 124 degrees, 14 minutes, 51 seconds W)

RANGE IN CHARACTERISTICS:

Soil moisture: The soils are usually moist and are dry less than 45 consecutive days between 10 and 30 cm in the four months following the summer solstice. The soils have an udic soil moisture regime.

Soil temperature: The mean annual soil temperature is 12 to 15 degrees C (54 to 59 degrees F). The mean summer soil temperature is 11 to 13 degrees C (53 to 56 degrees F.) and the mean winter soil temperature is 7 to 10 degrees C (45 to 50 degrees F). The difference between the mean winter and mean summer soil temperatures varies from 3 to 6 degrees C. The soils have an isomesic soil temperature regime.

Soil moisture: The soils are usually moist and are dry less than 45 consecutive days between 10 and 30 centimeters (4 and 12 inches) in the four months following the summer solstice.
Base Saturation is less than 60 percent between depths of 25 to 75 centimeters.

Depth to a lithic contact is 50 to 100 centimeters (20 to 40 inches).

The particle-size control section (weighted average):

Clay content: 27 to 35 percent
Rock fragments: 5 to 25 percent


O horizon

Hue: 10YR.
Value: 2 through 6 dry and moist.
Chroma: 1 through 4 dry and moist.

Texture: slightly decomposed organic material.
Wood fragments: 0 to 35 percent.
Reaction: moderate to slightly acid.

A horizon

Hue: 7.5YR or 10YR.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 3 or 4 dry, 2 or 3 moist.

Texture of fine earth: silt loam.
Rock fragments: 5 to 15 percent gravel.
Clay content: 15 to 25 percent.
Reaction: very strongly acid.

Bw horizon

Hue: 5YR or 7.5YR.
Value: 4 through 6 dry, 3 through 6 moist.
Chroma: 3 through 6 dry and moist.

Texture of fine earth: clay loam or silty clay loam.
Rock fragments: 5 to 25 percent gravel; 0 to 5 percent cobbles.
Clay content: 27 to 35 percent.
Reaction: very strongly acid.

C horizon

Hue: 5YR or 7.5YR.
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 4 through 6 dry and moist.

Texture of fine earth: clay loam or silty clay loam.
Rock fragments: 20 to 35 percent gravel; 0 to 10 percent cobbles.
Clay content: 27 to 35 percent.
Reaction: very strongly acid.

COMPETING SERIES: There are no other series in this family at this time.

GEOGRAPHIC SETTING: Bosland soils are on broad ridgetops and side slopes of coastal hills and mountains. Slopes are 0 to 90 percent. The soils formed in mixed colluvium and residuum derived from metasedimentary or metavolcanics. Elevations are 61 to 396 meters (200 to 1,300 feet). The climate is humid, characterized by warm wet winters and warm moist summers with fog. A strong marine influence limits the diurnal and annual range of temperature. The mean annual temperature is 11 to 14 degrees C (52 to 57 degrees F). The mean annual precipitation is 2286 to 3302 millimeters (90 to 130 inches). The frost-free period is 240 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dulandy, Floras, Guerin, Loeb, Macklyn, Vondergreen, Zwagg, and Wedderburn soils. Dulandy soils are loamy-skeletal. Floras soils are fine textured and 100 to 150 centimeters (40 to 60 inches) deep to a paralithic contact. Loeb, Macklyn, and Vondergreen soils have argillic horizons. Zwagg soils are coarse-loamy.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; negligible to high runoff; moderately high saturated hydraulic conductivity..

USE AND VEGETATION: The soils are used mainly for timber production, watershed, recreation, and wildlife habitat. Native vegetation is Douglas fir, redwood, tanoak, cascara buckthorn, red alder, evergreen huckleberry, salal, Pacific rhododendron, western swordfern, red elderberry, California laurel, and cascade Oregongrape.

DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Curry County, Oregon; 1995. The name is coined.

REMARKS: Formerly classified with the 10th edition as fine-loamy, isotic, isomesic Humic Dystrudepts.

Minerology changed from mixed to isotic 1/2000.

Diagnostic horizons and features recognized in this pedon include:

1. Umbric epipedon - from 3 to 31 centimeters. (A1, A2 horizons) The thickness of the dark colored surface is more than 1/3 the thickness of the solum.
2. Cambic horizon - from a depth of 31 to 69 centimeters. (Bw1, Bw2 horizons)
3. Particle-size control section - from 28 to 100 centimeters (11 to 40 inches) (Bw1, Bw2, and C horizons).
4. Depth to a lithic contact - 100cm.

Humic Dystrudepts feature - the soil has a base saturation (assumed) of less than 50 percent by ammonium acetate in some subhorizon between depths of 25 to 100 centimeters (10 and 40 inches), and has 21 kilograms of organic carbon per square meter form the surface to 100 centimeters (40 inches).

Soil classified using the 11th Edition of the Keys to Soil Taxonomy.
NASIS User Pedon ID 85OR015002


National Cooperative Soil Survey
U.S.A.