LOCATION TUJUNGA CA
The Tujunga series consists of very deep, somewhat excessively drained soils that formed in alluvium from granitic sources. Tujunga soils are on alluvial fans and floodplains, including urban areas. Slopes range from 0 to 12 percent. The mean annual precipitation is about 450 mm and the mean annual temperature is about 18 degrees C.
TAXONOMIC CLASS: Mixed, thermic Typic Xeropsamments
TYPICAL PEDON: Tujunga, on a 4 percent slope under in a maintained lawn at an elevation of 184 meters (603 feet). When described the soil was dry throughout. (Colors are for dry soil unless otherwise noted).
^A--0 to 4 centimeters; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2), moist; weak fine subangular blocky structure; friable, slightly sticky, slightly plastic; common very fine interstitial pores; neutral (pH 6.6); clear wavy boundary.
^C1--4 to 21 centimeters; pale brown (10YR 6/3) fine sandy loam, dark grayish brown (10YR 4/2), moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky, nonplastic; common very fine roots and common very coarse roots; common very fine tubular and common medium tubular pores; 1 percent subrounded granitic gravels; moderately alkaline (pH 7.9); clear smooth boundary.
C2--21 to 70 centimeters; pale brown (10YR 6/3) coarse sand, brown (10YR 5/3), moist; single grain; loose, loose, nonsticky, nonplastic; common very fine roots; 2 percent subrounded granitic cobbles and 9 percent subrounded gravel; slightly alkaline (pH 7.7); clear smooth boundary.
C3--70 to 125 centimeters; pale brown (10YR 6/3) sand, brown (10YR 5/3), moist; single grain; loose, loose, nonsticky, nonplastic; common very fine roots; 2 percent subrounded granitic cobbles and 3 percent granitic fine gravel; slightly alkaline (pH 7.4).
C4--125 to 200 centimeters; brown (10YR 5/3) loamy fine sand, dark grayish brown (10YR 4/2), moist; single grain; loose, loose, nonsticky, nonplastic; slightly alkaline (pH 7.4).
TYPE LOCATION: Los Angeles County, California, Valley Village Park, Los Angeles City Parks. 50ft. east of road near the intersection at Morrison Drive near two Sycamore trees. 34 degrees North latitude, 9 minutes, 38 seconds and 118 degrees, 22 minutes, 56 seconds West longitude, WGS84 - U.S.G.S Quad: Van Nuys.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil becomes moist below a depth of about 30 centimeters some time from October to December and remains moist in some part between depths of about 30 to 90 centimeters until April or May.
Mean annual soil temperature: 16 to 20 degrees C. The soil temperature usually does not go below 8 degrees C.
Textures in the particle size control section: coarse sand, sand, loamy sand, fine sand, loamy fine sandy, or have a gravelly texture modifier; thin strata with silt sized particles are lacking.
Sand content: greater than 35 percent combined medium to very coarse sand in the control section.
Rock fragments: dominantly 0 to 5 percent throughout; individual horizons may have up to 35 percent fragments.
Reaction: Slightly acid to moderately alkaline.
Human-transported materials (if present): less than 50 cm thick and is non-restrictive.
Dry color: hue of 2.5Y or 10YR, value of 4 to 7, chroma of 1 to 4
Moist color: hue of 2.5Y or 10YR, value of 3 to 5, chroma of 2 to 4
Texture: fine sand, sand, loamy sand, loamy fine sand. Pedons with surficial anthropogenic modification may be sandy loam, fine sandy loam. Some pedons have gravelly textures.
Artifacts: 0 to 10 percent construction debris.
Dry color: hue of 2.5Y or 10YR, value of 5 to 8, chroma of 1 to 6
Moist color: hue of 2.5Y or 10YR, value of 3 to 6, chroma of 2 to 6
Texture: coarse sand, sand, fine sand, loamy sand, loamy fine sand often stratified, or has a gravelly texture modifier.
Artifacts: 0 to 10 percent in horizons with human-transported materials.
COMPETING SERIES: These are the
Abaft soil: are found on stabilized sand dunes or beaches and are excessively drained.
Arnold soils: have a paralithic contact at a depth of 100 to 150 cm.
Briones soils: have a paralithic contact at a depth of 50 to 100 cm.
Corralitos soils: are formed in materials weathered from sandstone.
Delhi soils: have less than 35 percent coarse and very coarse sand.
Monoridge soils: have a paralithic contact at a depth of 50 to 100 cm.
Monvero soils: are formed in eolian deposits on dune fields on mountains from calcareous sandstone.
Pismo soils: are shallow to a paralithic contact of sandstone.
Sumiwawa soils: are shallow to a paralithic contact of sandstone.
Toags soil: have greater than 5 percent rock fragments and have less than 210 frost free days.
Setting: alluvial fans and floodplains.
Slopes: 0 to 9 percent.
Parent materials: alluvium weathered from granitic sources or similar. In urban areas there is usually a thin layer of human-transported materials spread over the surface.
Elevation: 2 to 600 meters.
Mean annual precipitation: 254 to 635 millimeters.
The mean annual temperature: 15 to 18 degrees C.
Frost free season: 225 days inland and 365 days approaching coastal areas.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
San Emigdio, and
Elder soils: have an irregular decrease in organic carbon and occur on similar landscape positions.
Gorgonio soils: have a mollic epipedon and occur on similar landscape positions.
Grangeville soils: are somewhat poorly drained and occur on slightly lower landscape positions.
Hanford soils: have a coarse-loamy particle size class, frost free season of 200 to 280 days and occur on similar landscape positions.
Hueneme soils: are somewhat poorly drained and occur on flooplains and low lying alluvial fans.
Metz soils: are derived from sedimentary sources, have thin lenses of loamy material and occur on floodplains.
Pico soils: have a mollic epipedon, coarse-loamy textures and occur on similar landscape positions.
Palmview soils: have a coarse-loamy particle size class and occur on slightly higher landscape positions.
San Emigdio soils: have weak or strong starification and there is an irregular decrease of organic carbon and occurs on alluvial fans or floodplains.
Soboba soils: have greater than 35 percent rock fragments in the control section and occur on alluvial fans in or near canyons..
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat excessively drained; negligible to low runoff; high saturated hydraulic conductivity. Flooding is none to frequent.
USE AND VEGETATION: This soil is used for grazing, citrus, grapes, other fruits, and urban residential or commercial development. Uncultivated areas have a cover of shrubs, annual grasses and forbs. In urban areas ornamentals and turf-grass are common.
DISTRIBUTION AND EXTENT: Central and southern coastal plains and valleys in MLRA 14 & 19. These soils are extensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Los Angeles County, California
REMARKS: Map units of Tujunga soil which occur at elevations above 1500 feet should probably be set up as a new series during MLRA updates. There are no taxonomic or series criteria to separate the high elevation soils. Tujunga soils mapped in the San Bernardino Co., S.W. part, Western Riverside Area, Tulare Co., Central part, occur above 1,500 feet in places and all of the Tujunga soil map units in the Kern Co., N. E. and S.E. parts are above 1,500 feet. Presently used in too many MLRAs: 14, 17, 18, 19, 29, 30.
Tujunga soils are being restricted to elevation range of 0 to 600 meters (0 to 1968 feet) in coastal plains and valleys in central and southern coastal areas of MLRA 14 and 19.
Type Location relocated to Valley Plaza Park in Los Angeles, CA during the Los Angeles County, Southeastern Part Soil Survey. OSD was modified at this time.
Surface disturbance (designated with the ^) is not series criteria and may or may not be present.
Diagnostic horizons and features recognized in this pedon are:
Ochric Epipedon: the zone from a depth of 0 to 4 cm
Human-transported materials: the zone from a depth of 0 to 21 cm
Particle Size Control Section for this pedon: 25 to 100 cm
NSSL Pedon No: 13N56584
User Site ID: S2013CA037007, 2012Ca696538
User Pedon ID: S2013CA037007
Classified using the Twelfth Edition Keys to Soil Taxonomy (2014)
National Cooperative Soil Survey