LOCATION PARKLAND CA
Established Series
IRD: JWH/JTB/SAA/ET
10/2016
PARKLAND SERIES
The Parkland series consists of very deep, moderately well drained soils formed in alluvium derived from mixed sedimentary sources including sandstone and mudstone. Parkland soils are on stream terraces and alluvial fans in mountain river valleys. Slope ranges from 0 to 9 percent. The mean annual precipitation is about 2160 mm and the mean annual air temperature is about 14 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Oxyaquic Argixerolls
TYPICAL PEDON: Parkland loam on a northeast facing slope of 3 percent under pasture. (Colors are for dry soil unless otherwise stated) When described on June 10, 2003, the soil was slightly moist below 50 centimeters.
Ap--0 to 10 centimeters; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; strong medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; 2 percent fine distinct irregular masses of oxidized iron in the matrix; 7 percent gravel; moderately acid (pH 5.6); clear smooth boundary. (5 to 25 centimeters thick)
Bt1--10 to 22 centimeters; brown (10YR 5/3) silt loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; common very fine tubular pores; many faint clay films on all faces of peds; 7 percent gravel; moderately acid (pH 5.6); abrupt smooth boundary. (10 to 30 centimeters thick)
Bt2--22 to 43 centimeters; brown (10YR 5/3) gravelly clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; moderately hard, very friable, moderately sticky and moderately plastic; common very fine, fine, and medium roots throughout; common very fine tubular pores; many distinct clay films on all faces of peds; 34 percent gravel; moderately acid (pH 5.8); abrupt smooth boundary.
Bt3--43 to 70 centimeters; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (2.5Y 3/2) moist; weak coarse subangular blocky structure; hard, friable, slightly sticky and moderately plastic; common very fine roots throughout; common very fine tubular pores; many distinct clay films on all faces of peds; 2 percent gravel; moderately acid (pH 5.8); clear wavy boundary.
Bt4--70 to 117 centimeters; grayish brown (2.5Y 5/2) silty clay loam, very dark grayish brown (2.5Y 3/2) moist; weak coarse subangular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine tubular pores; common distinct clay films on all faces of peds; 3 percent fine distinct irregular masses of oxidized iron in the matrix; 2 percent gravel; moderately acid (pH 5.8); clear wavy boundary.
Bt5--117 to 180 centimeters; light brownish gray (2.5Y 6/2) clay, olive brown (2.5Y 4/3) moist; weak coarse subangular blocky structure; extremely hard, friable, moderately sticky and very plastic; few very fine tubular pores; many distinct clay films or pressure faces on all faces of peds; 2 percent gravel; neutral (pH 6.6). (Combined thickness of the Bt horizons is 150 to 180 centimeters)
TYPE LOCATION: Humboldt County, California; about 1 km southwest of Garberville, CA; USGS Garberville Quadrangle; WGS84 Decimal degrees 40.0844444 latitude and -123.8011111 longitude;; UTM zone 10 431698mE, 4437422mN; NAD 83;
RANGE IN CHARACTERISTICS:
Depth to Redoximorphic Features: 50 to 100 centimeters
Thickness of Mollic Epipedon: 25 to 125 centimeters
Particle size control section (weighted average):
Rock fragments: 0 to 35 percent gravel
Clay content: 24 to 35 percent
A horizon
Hue: 10YR or 2.5Y
Value: 4 or 5, 2 or 3 moist
Chroma: 1 to 3, dry or moist
Rock fragments: 0 to 15 percent gravel
Clay content: 15 to 27 percent0
Reaction: strongly to slightly acid
Upper Bt horizons
Hue: 10YR or 2.5Y
Value: 5 to 7, 3 or 4 moist
Chroma: 2 to 4, dry or moist
Texture of fine earth: silt loam, silty clay loam, loam, clay loam, and sandy clay loam
Rock fragments: 0 to 35 percent gravel
Clay content: 18 to 35 percent
Reaction: strongly to moderately acid
Redoximorphic Features: fine and medium iron or iron-manganese masses in the matrix
Quantity: none to many
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 4 to 6
Lower Bt horizons
Hue: 10YR or 2.5Y
Value: 5 to 7 3 to 5 moist
Chroma: 1 to 6 dry or moist
Texture of fine earth: clay loam, sandy clay loam, and clay
Rock fragments: 0 to 35 percent gravel and 0 to 5 percent cobbles
Clay content: 27 to 45 percent
Reaction: moderately to slightly acid
Redoximorphic Features: fine and medium iron or iron-manganese masses in the matrix
Quantity: few to many
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 4 to 6
Redoximorphic features: fine and medium iron depletions
Quantity: none to common
Hue: 10 YR or 2.5Y
Value: 4 or 5, moist
Chroma: 1 or 2, moist
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Parkland soils are on stream terraces or alluvial fans in mountain river valleys. Slopes are 0 to 9 percent. Elevations are 35 to 140 meters. These soils formed in slope alluvium derived from mixed sedimentary sources including sandstone and mudstone. The climate is subhumid with warm, dry summers with a marine layer influence and cool, wet winters. Mean annual precipitation is 1525 to 3050 millimeters. Mean annual temperature is 13 to 15 degrees C. Frost free season is about 240 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Garberville (CA) and
Grannycreek (CA) soils. Garberville soils lack redoximorphic features within 100 centimeters and Grannycreek soils have redoximorphic features between 10 and 25 centimeters. Garberville soils occur on slightly higher positions and edges of terraces. Grannycreek soils occur on slightly lower, concave positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained, low or medium runoff, moderately high to moderately low saturated hydraulic conductivity.
USE AND VEGETATION: This soil is used for pasture and irrigated vegetable crops. Vegetation is annual and perennial grasses, pennyroyal, western rush, and other forbs.
DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Humboldt and Del Norte Counties Soil Survey, Southern Part, California, 2010. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Mollic epipedon - the zone from 0 to 117 centimeters (Ap, Bt1, Bt2, Bt3, Bt4 horizons).
2. Argillic horizon - the zone from 10 to 180 centimeters (Bt1, Bt2, Bt3, Bt4, and Bt5 horizons).
3. Oxyaquic conditions - the zone from 70 to 180 centimeters (Bt4 and Bt5 horizons)
4. Redoximorphic concentrations in the surface due to compaction, are common in these soils and do not indicate presence of a water table.
5. Particle size control section - 10 to 60 centimeters (Bt1, Bt2, Bt3 horizons) averages 29 percent clay and 16 percent fine sand or coarser, by weight, and 4 percent rock fragments.
ADDITIONAL DATA: NASIS User Pedon ID: 03CA601153
Keys to Soil Taxonomy, 12th edition
National Cooperative Soil Survey
U.S.A.