44 31—Lapine-Steiger-Wuksi complex, high elevation, 2 to 25 percent slopes

31—Lapine-Steiger-Wuksi complex, high elevation, 2 to 25 percent slopes

 Map Unit Setting

 General location: Eastern side of Timber Crater

Major land resource area (MLRA): 6

Elevation: 4,500 to 6,000 feet

Average annual precipitation: 25 to 50 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 10 to 50 days

 Map Unit Composition

 Lapine and similar soils: 35 percent

Steiger and similar soils: 30 percent

Wuksi and similar soils: 30 percent

Minor components: 5 percent

 Characteristics of the Lapine and Similar Soils

 Setting

 Landform: Ashfall

Geomorphic position: Mountainsides

Parent material: Ash and pumice

 Properties and qualities

 Slope: 2 to 25 percent

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Excessively drained

Permeability: Very rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 6.2 inches

 Interpretive groups

 Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Ceanothus velutinus/Carex inops

 Typical profile

 Oi—0 to 2 inches; slightly decomposed plant material

A—2 to 8 inches; paragravelly ashy loamy sand

Bw1—8 to 15 inches; paragravelly ashy loamy sand

Bw2—15 to 24 inches; very paragravelly ashy sand

C—24 to 60 inches; extremely paragravelly ashy sand

 Characteristics of the Steiger and Similar Soils

 Setting

 Landform: Stratovolcano

Geomorphic position: Mountainsides

Parent material: Ash and pumice

 Properties and qualities

 Slope: 2 to 25 percent

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Somewhat excessively drained

Permeability: Rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 6 inches

 Interpretive groups

 Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Ceanothus velutinus/Carex inops

 Typical profile

 A—0 to 4 inches; ashy loamy coarse sand

Bw1—4 to 10 inches; paragravelly ashy loamy coarse sand

Bw2—10 to 19 inches; paragravelly ashy loamy coarse sand

BC—19 to 29 inches; paragravelly ashy coarse sand

C1—29 to 35 inches; paragravelly ashy coarse sand

C2—35 to 60 inches; paragravelly ashy coarse sand

 Characteristics of the Wuksi and Similar Soils

 Setting

 Landform: Stratovolcano

Geomorphic position: Mountainsides

Parent material: Ash mixed with colluvium derived from andesite

 Properties and qualities

 Slope: 2 to 25 percent

Percentage of surface covered with stones and boulders: 10 percent

Restrictive features: None within a depth of 60 inches

Drainage class: Somewhat excessively drained

Permeability: Rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 7.2 inches

 Interpretive groups

 Ecological site: Forestland—(006XY701OR) Pinus ponderosa/Ceanothus velutinus/Carex inops

 Typical profile

 Oi—0 to 1 inch; slightly decomposed plant material

A—1 inch to 5 inches; cobbly ashy loamy sand

AB—5 to 14 inches; very cobbly ashy loamy coarse sand

Bw1—14 to 29 inches; very cobbly ashy sand

Bw2—29 to 37 inches; very cobbly ashy sandy loam

Bw3—37 to 60 inches; extremely cobbly ashy sandy loam

 Characteristics of the Minor Components

 Rock outcrop

 Percentage of map unit: 5 percent

Landform: Lava flow

Geomorphic position: Mountainsides

 Major Soil Features and Properties Affecting Management

 Lapine soil

 • Low soil strength

• High pumice content

• Very rapid permeability

 Steiger soil

 • Sandy textures

• Low soil strength

 Wuksi soil

 • Rock fragments on surface

• Rock fragments in soil profile

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