43 30—Lapine-Rock outcrop-Wuksi complex, 30 to 70 percent south slopes

30—Lapine-Rock outcrop-Wuksi complex, 30 to 70 percent south slopes

 Map Unit Setting

 General location: Buttes in the Sharp Peak area

Major land resource area (MLRA): 6

Elevation: 4,500 to 6,500 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: 40 percent

Rock outcrop: 30 percent

Wuksi and similar soils: 20 percent

Minor components: 10 percent

 Characteristics of the Lapine and Similar Soils

 Setting

 Landform: Ashfall

Geomorphic position: Side slopes of buttes

Parent material: Ash and pumice

 Properties and qualities

 Slope: 30 to 70 percent; northeast to northwest aspects

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/Arctostaphylos patula/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 Rock Outcrop

 Landform: Butte

Geomorphic position: Rock outcroppings on side slopes of buttes

Parent material: Andesite

Slope: 30 to 70 percent; northeast to northwest aspects

 Characteristics of the Wuksi and Similar Soils

 Setting

 Landform: Butte

Geomorphic position: Side slopes of buttes

Parent material: Ash mixed with colluvium derived from andesite

 Properties and qualities

 Slope: 30 to 70 percent; northeast to northwest aspects

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/Arctostaphylos patula/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

 Collier soils

 Percentage of map unit: 10 percent

Landform: Ashflow

Geomorphic position: Ashflow material at the base of buttes

 Major Features and Properties Affecting Management

 Lapine soil

 • Low soil strength

• High pumice content

• Water erosion

• Very rapid permeability

 Rock outcrop

 • Lack of soil material

 Wuksi soil

 • Rock fragments on surface

• Rock fragments in soil profile

• Water erosion

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