LOCATION REDAPPLE                CA

Established Series
SMM/AGB/TKK/JW
10/2018

REDAPPLE SERIES

The Redapple series consists of very deep, well drained soils formed in ashy colluvium over weathered colluvium and residuum from andesitic tuff breccia. The Redapple soils are on mountainflanks and mountaintops of lahars. Slopes range from 3 to 60 percent. The mean annual precipitation is about 1270 mm and the mean annual air temperature is about 12 degrees C.

TAXONOMIC CLASS: Fine, isotic, mesic Andic Palehumults

TYPICAL PEDON: Redapple ashy loam on a west-facing, linear, 12 percent slope, under cover of ponderosa pine, incense cedar and mountain misery at an elevation of 1300 meters. (Colors are for dry soils unless otherwise noted. When described on October 16th, 2007 the soil was dry to a depth of 71 cm and moist beneath.)

Oi--0 to 5 cm; slightly decomposed plant material.

Oe--5 to 8 cm; moderately decomposed plant material; abrupt smooth boundary. (Combined thickness of O horizons is 5 to 10 cm thick)

A1--8 to 20 cm; brown (7.5YR 4/3) ashy loam, very dark brown (7.5YR 2.5/2) moist; 42 percent sand; 20 percent clay; weak fine granular structure; soft, very friable, nonsticky, slightly plastic; slightly fluid; many very fine to coarse roots throughout; many very fine and fine interstitial pores; 2 percent subrounded very strongly cemented tuff breccia gravel; moderately acid (pH 5.9); clear smooth boundary.

A2--20 to 30 cm; strong brown (7.5YR 4/6) ashy loam, very dark brown (7.5YR 2.5/3) moist; 40 percent sand; 22 percent clay; weak fine subangular blocky structure; soft, very friable, nonsticky, slightly plastic; slightly fluid; common very fine and fine roots and many medium and coarse roots throughout; many very fine and fine interstitial pores; 2 percent subrounded very strongly cemented tuff breccia gravel, 1 percent subangular tuff breccia cobbles; moderately acid (pH 5.7); abrupt smooth boundary. (Combined thickness of A horizons is 10 to 35 cm)

2Bt1--30 to 41 cm; brown (7.5YR 5/4) clay loam, dark brown (7.5YR 3/4) moist; 34 percent sand; 27 percent clay; moderate medium and coarse subangular blocky structure; moderately hard, friable, slightly sticky, slightly plastic; common very fine to coarse roots throughout; common very fine and fine irregular and few fine tubular pores; 2 percent faint clay films and 10 percent faint silt coats on all faces of peds; 2 percent subrounded very strongly cemented tuff breccia gravel; moderately acid (pH 5.9); clear wavy boundary.

2Bt2--41 to 71 cm; 50 percent light brown (7.5YR 6/4) and 50 percent yellowish red (5YR 5/6) clay loam, 50 percent yellowish red (5YR 4/6) and 50 percent reddish brown (5YR 4/4) moist; 27 percent sand; 33 percent clay; strong medium and coarse subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; few very fine to coarse roots throughout; common very fine and fine irregular and few fine and medium tubular pores; 10 percent faint clay films on all faces of peds and surfaces along pores and 30 percent distinct silt coats on all faces of peds; moderately acid (pH 5.8); clear wavy boundary. (Combined thickness of 2Bt horizons is 30 to 90cm)

3Bt3--71 to 119 cm; yellowish red (5YR 5/8) clay, yellowish red (5YR 4/6) moist; 11 percent sand; 59 percent clay; strong medium and coarse subangular blocky structure; very hard, firm, very sticky, moderately plastic; few very fine to medium roots throughout; few very fine and fine irregular and few fine tubular pores; 45 percent prominent clay films on all faces of peds and surfaces along pores; 2 percent very strongly cemented tuff breccia gravel; moderately acid (pH 5.9); gradual wavy boundary.

3Bt4--119 to 150 cm; yellowish red (5YR 5/8) clay, yellowish red (5YR 4/6) moist; 12 percent sand; 51 percent clay; strong medium and coarse subangular blocky structure; very hard, friable, very sticky, moderately plastic; few very fine to medium roots throughout; few very fine tubular and irregular pores; 35 percent prominent clay films on all faces of peds and surfaces along pores; 2 percent subrounded very strongly cemented tuff breccia gravel; moderately acid (pH 5.8); gradual wavy boundary.

3Bt5--150 to 173 cm; reddish yellow (5YR 6/6) clay, yellowish red (5YR 5/6) moist; 13 percent sand; 47 percent clay; strong coarse subangular blocky structure; very hard, friable, moderately sticky, moderately plastic; few very fine to medium roots throughout; few very fine irregular and tubular pores; 20 percent distinct clay films on all faces of peds and surfaces along pores; 1 percent very fine manganese masses on faces of peds; 1 percent subrounded moderately cemented tuff breccia paragravel; moderately acid (pH 5.9); gradual wavy boundary.

3Bt6--173 to 216 cm; yellowish red (5YR 5/6) paragravelly clay, 50 percent yellowish red (5YR 4/6) and 50 percent yellowish red (5YR 5/6) moist; 12 percent sand; 49 percent clay; moderate coarse subangular blocky structure; hard, very firm, moderately sticky, moderately plastic; few very fine and fine roots throughout; few very fine irregular pores; 10 percent distinct clay films on all faces of peds and surfaces along pores; 15 percent subrounded moderately cemented tuff breccia paragravel; moderately acid (pH 5.7).. (Combined thickness of 3Bt horizons exceeds 100 cm)

TYPE LOCATION: Calaveras County, California; about 9.3 km (6 mi) northeast of the community of West Point; USGS 7.5 minute topographic quadrangle: Devils Nose, California. WGS84 38.432640 latitude and -120.427528 longitude; UTM zone 10 4256592 meters N, 724540 meters E NAD83.

RANGE IN CHARACTERISTICS:

Soil temperature: The mean annual soil temperature at 50 cm is 12 to 15 degrees C and the difference between mean summer and mean winter soil temperature is greater than 6 degrees C. The soils have a mesic temperature regime.

Soil moisture: The soil moisture control section is dry in all parts from June to October. The soils have a xeric soil moisture regime.

Diagnostic Feature(s):
Umbric epipedon thickness: 18 to 50 cm
Argillic horizon thickness: 80 to >200 cm
Depth to abrupt textural change: 18 to 100 cm
Depth to paralithic contact: >200 cm (no contact in series control section)
Andic soil properties thickness: less than 36 cm cumulative within the upper 60 cm


A horizons
Hue: 7.5YR or 10YR
Value: 3 to 5 dry, 2 to 3 moist
Chroma: 3 to 6 dry, 2 or 3 moist
Texture: ashy loam
Clay content: 12 to 22 percent
Rock fragments: 0 to 25 percent
0 to 10 percent gravels
0 to 20 percent cobbles
Reaction: strongly acid to slightly acid
Bulk density (1/3 bar): 0.75 to 1.05 g/cc
Acid-oxalate extractable Al + 1/2 Fe: 0.7 to 2 percent
NZ Phosphate retention: 55 to 90 percent

2Bt horizons
Hue: 7.5YR or 5YR
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 3 to 6 dry, 3 or 4 moist
Texture: clay loam, silty clay loam, clay
Clay content: 30 to 45 percent
Rock fragments: 0 to 20 percent
0 to 15 percent gravels
0 to 20 percent cobbles
Reaction: strongly acid to slightly acid

3Bt horizons
Hue: 5YR or 7.5YR
Value: 5 to 7 dry, 3 or 4 moist
Chroma: 3 or 4 dry, 3 or 4 moist
Texture: clay, silty clay
Clay content: 40 to 60 percent
Rock fragments: 0 to 20 percent
0 to 5 percent gravels
0 to 15 percent paragravels
0 to 5 percent cobbles
Reaction: strongly acid to slightly acid

COMPETING SERIES: There are currently no other series in this family.

GEOGRAPHIC SETTING: The Redapple soils are on mountainflanks and mountaintops of lahars. Slopes range from 3 to 60 percent. These soils formed in ashy colluvium over weathered colluvium and residuum derived from andesitic tuff breccia. Elevation is 950 to 1500 meters. The climate is Mediterranean with warm, dry summers and cool, moist winters. The mean annual precipitation is 1000 to 1325 mm and the mean annual air temperature is 11 to 14 degrees C. The frost free season is 175 to 215 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Devilsnose, Lilygap, Mantree and McCarthy soils. The Devilsnose and McCarthy soils are medial over loamy-skeletal and medial-skeletal, respectively, and occur on middle to upper thirds of mountainflanks. Lilygap soils are medial over loamy and are on lower third of mountainflanks. Mantree soils are fine-loamy, occur on mountaintops and mountainflanks below lahars, and formed in colluvium from andesitic tuff breccia over residuum from intrusive igneous rock.

DRAINAGE AND PERMEABILITY: Well drained, moderately low saturated hydraulic conductivity.

USE AND VEGETATION: This soil is used for timber production, wildlife habitat, watershed, recreation and limited homesite development. Vegetation is sugar pine, ponderosa pine, incense cedar, California black oak, deerbrush, whiteleaf manzanita, greenleaf manzanita, gray pinemat manzanita, and mountain misery.

DISTRIBUTION AND EXTENT: Sierra Nevada Mountains of California; MLRA 22A. The series is not extensive.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES PROPOSED: Calaveras County, California. Source of name is from the community of Red Apple near the Stanislaus National Forest boundary on CA Highway 4.

REMARKS:

Diagnostic horizons and features recognized in this pedon are:
Andic soil properties 8 to 20 cm
Umbric epipedon 8 to 30 cm
Argillic horizon 30 to 216 cm
Abrupt textural change 71 cm

Particle Size Control Section for this pedon: 30 to 80 cm.

Organic carbon content between mineral soil surface and 100 cm depth: greater than 12 kg C /sq. m
Organic carbon content in upper 15 cm of argillic horizon: 1 to 2 percent

ADDITIONAL DATA:
Pedon information for this type location only:
NASIS User Pedon ID: S07CA009004
Pedon Type: OSD pedon
Pedon Purpose: laboratory sampling site
Lab Source ID: SSL
Lab Pedon #: 08N0158

Soil classified using the 12th Edition of the Keys to Soil Taxonomy.

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National Cooperative Soil Survey
U.S.A.