LOCATION WOODLEAF CAEstablished Series
TAXONOMIC CLASS: Clayey-skeletal, magnesic, mesic Ultic Haploxeralfs
TYPICAL PEDON: Woodleaf gravelly loam - on a west facing slope of 5 percent under ponderosa pine, incense cedar and manzanita at 3175 feet elevation. (Colors are for dry soil unless otherwise stated. When described on August 25, l983, the soil was dry throughout.)
Oi--1/2 to 0 inches; partially decomposed twigs and needles.
A1--0 to 4 inches; dark yellowish brown (10YR 4/4) gravelly loam, dark yellowish brown (10YR 3/4) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many very fine and fine interstitial pores and common very fine tubular pores; 20 percent pebbles, 5 percent cobbles and 1 percent stones; medium acid (pH 5.6); clear smooth boundary. (2 to 5 inches thick)
A2--4 to 9 inches; strong brown (7.5YR 4/6) gravelly loam dark reddish brown (5YR 3/4) moist; moderate fine granular structure; slightly hard, very friable, sticky and slightly plastic; common very fine, fine, medium and coarse roots; many very fine and fine interstitial pores and common very fine and fine tubular pores; 25 percent pebbles; 10 percent cobbles and 1 percent stones; medium acid (pH 5.7) clear wavy boundary. (2 to 5 inches thick)
2Bt1--9 to 17 inches; yellowish red (5YR 4/6) very gravelly clay loam, dark reddish brown (5YR 3/3) moist; weak medium subangular blocky structure; hard, friable, sticky and plastic; many fine and medium and common very fine and coarse roots; many very fine, fine and medium tubular pores; common thin clay films on ped faces and lining pores; 30 percent pebbles, 15 percent cobbles and 2 percent stones; medium acid (pH 5.7); clear wavy boundary. (7 to 10 inches thick)
2Bt2--17 to 28 inches; dark brown (7.5YR 4/4) very gravelly clay loam, dark brown (7.5YR 3/4) moist; strong medium subangular blocky structure; very hard, firm, sticky and plastic; common medium and coarse and roots; few very fine and fine; few very fine and fine tubular pores; many thick clay films on ped faces; 30 percent pebbles, 15 percent cobbles, 2 percent stones; slightly acid (pH 6.1); abrupt wavy. (9 to 20 inches thick)
R--28 inches; serpentine bedrock.
TYPE LOCATION: Yuba County, California; about .25 miles south of Woodleaf, then southeast on gravel road about 1 mile, then 200 feet east, about 1,500 feet north and 1300 feet west of the southeast corner section 16, T.19 N., R.7 E. MDBM. Clipper Mills Quadrangle.
RANGE IN CHARACTERISTICS: Depth to lithic contact ranges from 20 to 40 inches. The mean annual soil temperature ranges from 47 to 54 degrees F. The soil temperature is above 47 degrees F. from April 1 to November 15. The 6 to 16 inch zone is dry in all parts from July 1 to September 1 and is moist in all parts from October 10 to June 15. Base saturation is 50 to 75 percent.
The A horizon has dry color of 10YR 5/4, 4/4, 4/3; or 7.5YR 4/6 and moist color of 10YR 3/3, 3/4; 7.5YR 3/4 or 5YR 3/4. Clay content ranges from 18 to 27 percent. Rock fragments range from 15 to 35 percent. Stones range from 0 to 3 percent, cobbles from 5 to 15 percent and gravels range from 10 to 30 percent. Reaction is medium to slightly acid. Organic carbon content ranges from 1 to 3 percent.
The 2Bt horizon has dry color of 10YR 6/4, 6/6; 7.5YR 4/3, 4/4, 4/6 or 5YR 4/6 and moist color of 10YR 4/4; 7.5YR 3/4; 5YR 3/3 or 3/4. It is very gravelly clay loam or very gravelly clay with 35 to 60 percent clay. Rock fragments range from 35 to 55 percent. Stones range from 0 to 3 percent; cobbles range from 10 to 25 percent and gravels range from 25 to 40 percent. Reaction is medium acid to neutral. Calcium:Magnesium ratio is 1:5 or more and usually increases with depth.
COMPETING SERIES: These are the Ishi Pishi series. Ishi Pishi soils have bedrock at 40 to 60 inches.
GEOGRAPHIC SETTING: The Woodleaf soils are on mountains and have slopes of 3 to 30 percent. These soils formed in material from ultramatic basic rocks with a large amount of serpentine minerals. Elevations are 2000 to 3200 feet. The climate has warm, dry summers and cool, wet winters. The average annual precipitation is 50 to 70 inches. The average January temperature is 38 to 44 degrees F and the average July temperature is 67 to 72 degrees F.; mean annual temperature is 50 to 57 degrees F. The frost-free season is 160 to 190 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Sites series. Sites soils have bedrock at greater than 40 inches and are in similar landscape positions.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; slow permeability.
USE AND VEGETATION: Used mainly for timber production and watershed. Natural vegetation is ponderosa pine, incense cedar and whiteleaf manzanita.
DISTRIBUTION AND EXTENT: Northern part of the Sierra Nevada Range of California. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Yuba County, California, l988.
REMARKS: Woodleaf soils were mapped as Dubakella soils in the "Soils of the Yuba Area"; University of California, Davis, and Yuba County 1969.
ADDITIONAL DATA: Sampled for complete characterization by NSSL as S84CA-115-009.