LOCATION ARLYNDA CA

Established Series
DWH/JTB/SAA/ET
05/2016

ARLYNDA SERIES

The Arlynda series consists of very deep, very poorly drained soils on backswamps, depressions, meander scars, and low flood-plain steps on alluvial plains near the Pacific Ocean and along lower reaches of rivers and streams. These soils formed in alluvium derived from mixed sources. Slopes range from 0 to 9 percent. Mean annual precipitation is about 1015 millimeters (40 inches). Mean annual temperature is about 11 degrees C (51 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, isomesic Fluvaquentic Endoaquepts

TYPICAL PEDON: Arlynda peat on a 1 percent slope under pasture grasses, ryegrass, barley, and buttercup at an elevation of 1 meter (3 feet). (Colors are for moist soil unless otherwise stated. When described on June 25, 1990 the soil was moist throughout with a water table at 79 centimeters (31 inches).)

Oi--0 to 8 centimeters (0 to 3 inches); very dark gray (10YR 3/1) peat, very dark grayish brown (10YR 3/2) dry, very dark grayish brown (10YR 3/2) rubbed; 80 percent fibers, 50 percent rubbed, moderately acid (pH 5.6); clear smooth boundary. (0 to 10 centimeters thick)

A--8 to 36 centimeters (3 to 14 inches); dark gray (2.5Y 4/1) silty clay loam, gray (2.5Y 6/1) dry; moderate coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many very fine and fine roots; common very fine and fine tubular pores; many medium prominent dark yellowish brown (10YR 4/6) iron-manganese masses; neutral (pH 6.8); gradual wavy boundary. (15 to 43 centimeters thick)

Bg1--36 to 56 centimeters (14 to 22 inches); dark gray (2.5Y 4/1) silty clay loam, gray (2.5Y 6/1) dry; medium fine subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine and fine tubular pores; many medium prominent dark yellowish brown (10YR 4/6) iron-manganese masses; neutral (pH 6.8); gradual wavy boundary. (15 to 56 centimeters thick)

Cg1--56 to 104 centimeters (22 to 41 inches); dark gray (2.5Y 4/1) silty clay loam, gray (2.5Y 6/1) dry; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; many medium prominent dark yellowish brown (10YR 4/6) iron-manganese masses; common prominent strong brown (7.5YR 4/6) iron stains lining root channels and/or pores; slightly acid (pH 6.2); gradual wavy boundary. (30 to 94 centimeters thick)

Cg2--104 to 160 centimeters (41 to 63 inches); dark gray (5Y 4/1) silty clay loam; gray (5Y 6/1) dry; massive; hard, firm, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; many medium prominent strong brown (7.5YR 4/6) masses of iron accumulation; common prominent strong brown (7.5YR 4/6) iron stains lining root channels and/or pores; few medium prominent strong brown (7.5YR 4/6) iron-manganese concretions, cylindrical, very weakly cemented; neutral (pH 6.8). (23 to 74 centimeters thick)

TYPE LOCATION: Humboldt County, California; about 3.2 kilometers west of Loleta; On Copenhagen Road, 1.5 kilometers south of Quinn Road, west 1.2 kilometers on dirt road, north 213 meters, west 46 meters; nonsectionized area, T.3N, R.2W, HB&M; Cannibal Island Quadrangle WGS84 Decimal degrees 40.6658333 latitude, -124.2661111 longitude. UTM Zone 10 392976mE, 4502447mN, NAD 83.

RANGE IN CHARACTERISTICS:

Soil Moisture: Moist in all parts of the soil moisture control section between the depths of 13 to 40 centimeters (5 to 16 inches) in most years and saturated in some parts during the months of December through April. The soils have an aquic moisture regime.

Soil Temperature: The mean annual soil temperature at 50 centimeters (20 inches) is 12 to 14 degrees C (53 to 57 degrees F). The average summer soil temperature is about 16 degrees C and the average winter soil temperature is about 10 degrees C. The difference between average summer and winter soil temperatures is 6 or less degrees C.

Depth to redoximorphic features: 0 to 10 centimeters (0 to 4 inches)

Endosaturation: The water table is at a depth of 0 to 10 centimeters (0 to 4 inches)from about December through April, between 15 and 90 centimeters (6 to 35 inches) in May, between 30 and 90 centimeters (12 to 35 inches) June through July, and 90 centimeters (35 inches) to greater than 182 centimeters (72 inches) from August through November.

Electrical Conductivity: nonsaline to very slightly saline(0 to 4 mmhos/cm)

Particle size control section (weighted average):
Clay content: 25 to 34 percent

Some pedons have O horizons

O horizon
Hue: 10YR
Value: 3, 4 dry
Texture of fine earth: peat
Reaction: neutral

A horizon
Hue: 10YR, 2.5Y or 5Y
Value: 3 or 4 moist, 5 to 7 dry (Thickness of horizons with dry value 5 and moist value 3 is less than 25 centimeters)
Chroma: 1 or 2 moist, 1 or 2 dry
Clay content: 25 to 34 percent
Reaction: slightly acid to neutral

Redoximorphic features: fine and medium iron-manganese masses in the matrix, iron stains lining root channels and and/or pores
Quantity: common to many
Hue: 7.5YR, 10YR, 2.5YR, or 5YR
Value: 3 to 6
Chroma: 4 through 8

Upper Bg horizon
Hue: 2.5Y or 5Y
Value: 4 or 5 moist, 5 to 7 dry
Texture of fine earth: silt loam or silty clay loam
Clay content: 25 to 34 percent
Reaction: slightly acid to slightly alkaline

Redoximorphic features: fine and medium iron-manganese masses in the matrix, iron stains lining root channels and/or pores
Quantity: common to many
Hue: 10YR, 7.5YR, 2.5YR, or 5YR
Value: 3 to 6
Chroma: 4 through 8

Lower Bg horizon
Hue: 2.5Y, 5Y, or N
Value: 4 or 5 moist, 5 to 7 dry
Chroma: / or 1, moist and dry
Texture of fine earth: silt loam, silty clay loam, clay loam
Clay content: 21 to 39 percent
Reaction: slightly acid to slightly alkaline

Redoximorphic features: fine and medium iron-manganese masses in the matrix, iron stains lining root channels and/or pores; medium iron- manganese concretions, cylindrical, very weakly cemented
Quantity: few to many
Hue: 10YR, 7.5YR, 2.5YR, or 5YR
Value: 3 to 6
Chroma: 4, 6, or 8

COMPETING SERIES: These are the Canalschool and Weott series. Canalschool has depth to redoximorphic features of between 25 cm to 50 cm (10 to 20 inches). Weott soils have chromas of greater than 1 in (3 centimeters) the Upper Bg horizons.

GEOGRAPHIC SETTING: Arlynda soils are on backswamps, depressions, meander scars and low flood-plain steps on alluvial plains near the Pacific Ocean and along lower reaches of rivers and streams. Backswamps and meander scars form an intricate pattern in areas not leveled. These old channels are mostly cut off from the current tidal action by tide gates. Slopes are 0 to 9 percent. The slopes greater than 5 percent are on meander scar sideslopes and are very short slopes. These soils formed in alluvium derived from mixed sources. Elevation is 0 to 50 meters (0 to 160 feet). The climate is humid with cool, foggy summers and cool, rainy winters. Mean annual precipitation is 890 to 2030 millimeters (35 to 80 inches). The mean January temperature is about 8 degrees C. The mean July temperature is about 14 degrees C. The mean annual air temperature is 10 to 13 degrees C (50 to 55 degrees F). Frost free season is about 275 to 330 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ferndale, Occidental, Swainslough, and Weott soils. Ferndale soils have redoximorphic features at a depth greater than 100 centimeters (40 inches), and occur on high flood-plain steps. Occidental soils are on depressions, meander scars, and reclaimed tidal marsh and have 35 to 40 percent clay in the particle size control section. Swainslough soils are on backswamps, depressions, low-flood-plain steps, and reclaimed tidal marshes on alluvial plains near the Pacific Ocean and have 35 to 45 percent clay in the particle size control section. Weott soils are on slightly higher backswamp, depression, and low flood-plain step positions than Arlynda soils and have the water table closer to the surface for shorter periods.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Very poorly drained; very high runoff; moderately slow permeability; moderately high saturated hydraulic conductivity. The soils are occasionally flooded for brief periods December through February. The soils on 0 to 2 percent slopes are frequently ponded 1 to 60 centimeters deep for long periods December through April. Some fields are partially drained by ditches and protected from flooding by tide gates.

USE AND VEGETATION: These soils are primarily used for pasture and hay production. Nearly all areas of this soil have been cleared. Natural vegetation is estimated to have been rushes and sedges in marshland or under a redwood canopy on the lower reaches of rivers and streams.

DISTRIBUTION AND EXTENT: Coastal Redwood Belt MLRA 4B. The series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Redwood National and State Parks, Humboldt Del Norte Area, California, 2007. Name is from a small community near Ferndale, California.

REMARKS: Arlynda soils were proposed in July of 1989 as fine-silty, mixed, nonacid, mesic Typic Fluvaquents. Reclassification to fine-silty, nonacid, superactive, isomesic, Fluvaquentic Endoaquepts is based on changes in Keys to Soil Taxonomy, tenth edition, and temperature data recorded in the survey area 2001 through 2004.

Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon - the zone from 0 to 36 centimeters (O and A horizons).
2. Cambic horizon - the zone from 36 to 56 centimeters (Bg1 horizon).
3. Particle size control section - the zone from 25 to 100 centimeters (A, Bg1 and Cg1 horizons).

NASIS User Pedon 90CA600625

Soil classified using Keys to Soil Taxonomy, 12th edition.

National Cooperative Soil Survey
U.S.A.