Classification of the Soils
Wuksi Series
Depth class: Very deep
Drainage class: Somewhat excessively drained
Permeability: Rapid
Position on landscape: Lava flows and volcanic buttes
Parent material: Ash mixed with colluvium derived from andesite
Slope range: 2 to 70 percent
Elevation: 4,500 to 6,500 feet
Average annual precipitation: 25 to 40 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 10 to 50 days
Taxonomic class: Ashy-skeletal, glassy Xeric Vitricryands
Typical Pedon
Oi—0 to 1 inch; slightly decomposed needles; abrupt smooth boundary.
A—1 inch to 5 inches; dark yellowish brown (10YR 3/4) cobbly ashy loamy sand, dark yellowish brown (10YR 4/4) dry; weak fine granular structure; loose, nonsticky and nonplastic; many very fine, fine, and medium roots; many very fine irregular pores; 15 percent andesite gravel and 15 percent andesite cobbles; strongly acid (pH 5.4); clear wavy boundary.
AB—5 to 14 inches; brown (7.5YR 4/4) very cobbly ashy loamy coarse sand, strong brown (7.5YR 4/6) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots and common medium and coarse roots; many fine irregular pores; 15 percent andesite gravel, 30 percent andesite cobbles, and 5 percent andesite stones; moderately acid (pH 6.0); clear wavy boundary.
Bw1—14 to 29 inches; dark brown (7.5YR 3/4) very cobbly ashy loamy sand, strong brown (10YR 4/6) dry; weak very fine subangular blocky structure; soft, very friable , nonsticky and nonplastic; many very fine and fine roots and common medium roots; many fine and medium irregular pores; 15 percent andesite gravel, 35 percent andesite cobbles, and 5 percent stones; moderately acid (pH 6.0); clear wavy boundary.
Bw2—29 to 37 inches; brown (7.5YR 4/3) very cobbly ashy sandy loam, yellowish brown (10YR 5/6) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; many fine and medium irregular pores; 15 percent andesite gravel, 35 percent andesite cobbles, and 5 percent andesite stones; moderately acid (pH 6.0); clear irregular boundary.
Bw3—37 to 60 inches; brown (7.5YR 4/3) extremely cobbly ashy sandy loam, yellowish brown (7.5YR 5/6) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine irregular pores; 15 percent andesite gravel, 55 percent andesite cobbles, and 5 percent andesite stones; moderately acid (pH 6.0).
Typical Pedon Location
Map unit in which located: Lapine-Steiger-Wuksi complex, high elevation, 2 to 25 percent slopes
Location in park: Northeastern side of Crater Lake National Park, in the Sharp Peak area and on the eastern flank of Timber Crater; 580696 meters easting and 4766251 meters northing, UTM Zone 10T, NAD 27
Range in Characteristics
Profile:
Depth to bedrock—more than 60 inches
Content of clay—0 to 5 percent
A and AB horizons (where present):
Hue—10YR or 7.5YR
Value—3 or 4 moist, 4 to 6 dry
Chroma—2 to 4 moist or dry
Texture—cobbly ashy loamy sand, cobbly ashy loamy coarse sand, very cobbly ashy loamy sand, and very cobbly ashy loamy coarse sand
Content of gravel—10 to 30 percent
Content of cobbles—15 to 45 percent
Content of stones—0 to 5 percent
Bw horizon and C horizon (where present):
Hue—10YR or 7.5YR
Value—3 to 5 moist, 4 to 6 dry
Chroma—3 to 6 moist or dry
Content of gravel—15 to 25 percent
Content of cobbles—25 to 60 percent
Content of stones—0 to 5 percent
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