LOCATION TONNOR CA
Established Series
REV: BAL/JPS/ET
05/2016
TONNOR SERIES
The Tonnor series consists of very deep, well drained soils on floodplain-steps. These soils formed in alluvium derived from mixed sources. Slope ranges from 2 to 9 percent. The mean annual precipitation is about 1524 millimeters (59 inches) and the mean annual temperature is about 16 degrees C (60 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, active, thermic Fluventic Dystroxerepts
TYPICAL PEDON: Tonnor loam - under a stand of annual and perennial grasses. When described on June 5, 2002, the soil was dry throughout. (Colors are for dry soil unless otherwise noted.)
A--0 to 10 centimeters (0 to 4 inches); light yellowish brown (2.5Y 6/3) loam, olive brown (2.5Y 4/3) moist; strong thin platy and weak medium subangular blocky structure; hard, very friable, nonsticky and nonplastic; many very fine, and fine roots throughout; many very fine and fine interstitial, and many medium tubular pores; slightly acid (pH 6.4); clear smooth boundary. (5 to 20 centimeters thick)
Bw1--10 to 36 centimeters (4 to 14 inches); light yellowish brown (2.5Y 6/3) loam, olive brown (2.5Y 4/3) moist; weak medium subangular blocky structure; hard, very friable, nonsticky and nonplastic; many very fine and fine roots throughout; common fine and medium tubular pores; slightly acid (pH 6.4); clear smooth boundary.
Bw2--36 to 61 centimeters (14 to 24 inches); light yellowish brown (2.5Y 6/3) loam, olive brown (2.5Y 4/3) moist; weak medium subangular blocky structure; hard, very friable, nonsticky and nonplastic; many very fine and fine roots; common fine and medium tubular pores; neutral (pH 6.6); gradual smooth boundary.
Bw3--61 to 76 centimeters (24 to 30 inches); light yellowish brown (2.5Y 6/3) loam, olive brown (2.5Y 4/3) moist; moderate medium subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; many very fine and fine roots throughout; common fine and medium tubular pores; neutral (pH 6.6); gradual smooth boundary.
Bw4--76 to 127 centimeters (30 to 50 inches); light yellowish brown (2.5Y 6/3) loam, olive brown (2.5Y 4/3) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; common fine and medium tubular pores; moderately acid (pH 6.0); clear smooth boundary. (Combined thickness of Bw horizons is 50 to 100 centimeters)
C--127 to 154 centimeters (50 to 61 inches); light yellowish brown (2.5Y 6/3) very fine sandy loam, olive brown (2.5Y4/3), moist; massive; slightly hard, very friable, nonsticky and nonplastic; common very fine through coarse roots throughout; common fine and medium tubular pores; neutral (pH 6.6). (0 to 100 centimeters thick)
TYPE LOCATION: Humboldt County, California; Hoopa Valley; USGS Hoopa topographic quadrangle; WGS84 Decimal degrees 41.0411111 latitude and
-123.6663889 longitude; UTM Zone 10 441687mE, 4547249mN, NAD83.
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is dry from July 1st to October 15th and moist in all parts from November 15 to June 1st. This soil has a xeric soil moisture regime.
Soil temperature: The mean annual soil temperature is 15 to 20 degrees C (59 to 68 degrees F). The difference between the mean summer and mean winter temperature is 6 degrees C or greater. This soil has a thermic soil temperature regime.
Soil reaction: neutral to moderately acid throughout the soil profile.
Organic carbon irregular decrease with depth from 25 to 125 centimeters.
Surface fragments: 0 to 10 percent gravel
Particle Size Control Section (weighted average):
Clay content: 18 to 27 percent
Rock fragments: 0 to 15 percent gravel
A horizons
Hue: 10YR or 2.5Y
Value: 4 through 6, dry or moist
Chroma: 2 through 5, dry or moist
Texture of the fine earth fraction: loam
Clay content: 18 to 27 percent
Rock fragments: 0 to 15 percent gravel
Bw horizons
Hue: 10YR or 2.5Y
Value: 4 through 7 dry; 3 through 5 moist
Chroma: 2 through 4 dry or moist
Texture of the fine earth fraction: loam and silt loam
Clay content: 18 to 27 percent
Rock fragments: 0 to 15 percent gravel
C horizons
Hue: 10YR or 2.5Y
Value: 4 through 7 dry; 3 through 5 moist
Chroma: 2 through 4 dry or moist
Texture of the fine earth fraction: very fine sandy loam
Clay content: 14 to 18 percent
Rock fragments: 0 to 15 percent gravel
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Tonnor soils are on nearly level to gently sloping floodplain-steps with slopes of 2 to 9 percent at elevations of 74 to 288 meters (243 to 945 meters). Tonnor soils formed in recent alluvium derived from mixed sources. The climate is subhumid with warm, dry summers and cool, wet winters. The mean annual precipitation is 1250 to 2032 millimeters (49 to 80 inches). Mean annual air temperature is 15 to 20 degrees C (59 to 68 degrees F). The frost free period is about 200 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the
Soctish series. The Soctish soils do not have a cambic horizon and are on lower floodplain-steps.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium runoff; moderate high saturated hydrologic conductivity.
USE AND VEGETATION: Used for livestock grazing, orchards and urban development. Vegetation on uncultivated areas is bristly dogtail, soft brome, blue wildrye and orchardgrass.
DISTRIBUTION AND EXTENT: Siskiyou-Trinity Area, MLRA 5. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Humboldt County, California, 2013. Proposed 2006.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon - the zone from 0 to 10 centimeters (A horizon)
2. Cambic horizon the zone from 10 to 127 centimeters (Bw1, Bw2, Bw3, and Bw4 horizons)
3. Particle size control section - the zone from 25 to 100 centimeters, averaging (by weight) 19 percent clay and 27 percent fine sand and coarser. (Bw1, Bw2 horizons)
ADDITIONAL DATA:
This soil was mapped by the Department of Land, Air, and Water Resources, University of California, Davis, in 1975 for the Soil Survey of Hoopa Valley, California.
NSSL, Pedon Number: 08N0448
Nasis NASIS User Pedon ID: 02CA023605008
Soils classified using Keys to Soil Taxonomy, 121th edition.
National Cooperative Soil Survey
U.S.A.