LOCATION MESQUITO ORTentative Series
TAXONOMIC CLASS: Ashy-skeletal, glassy, nonacid Typic Cryaquands
TYPICAL PEDON: Mesquito supporting the ponderosa pine/common snowberry-flood plain plant association (CPS5-11) on a 6 percent slope with southwest aspect at 4665 feet. When described on 7 September 1999 the soil was moist from 0 to 20 inches and wet from 20 to 30 inches (colors are for dry soil unless otherwise noted).
A--0 to 1 inch; dark grayish brown (10YR 4/2) mucky ashy sandy loam, black (7.5YR 2.5/1) moist; moderate fine granular structure; soft, very friable, non-sticky and slightly plastic; many very fine roots; many very fine interstitial pores; trace stones and boulders; few fine distinct black (2.5Y 2.5/1) manganese masses in matrix, faint black (2.5Y 2.5/1) moist; neutral (pH 6.6); abrupt smooth boundary. (1/2 to 4 inches thick)
Ac1--1 to 10 inches; grayish brown (2.5Y 5/2) paragravelly ashy sandy loam, black (10YR 2/1) moist; weak coarse subangular blocky structure parting to moderate fine granular; soft, very friable, non-sticky and slightly plastic; common very fine, fine, medium and coarse roots; many very fine interstitial pores; 10 percent paragravel, trace cobbles, 5 percent stones and boulders; common fine distinct black (2.5Y 2.5/1) manganese nodules and masses in matrix, faint black (2.5Y 2.5/1) moist; moderately acid (pH 6.0); abrupt smooth boundary. (1 to 10 inches thick)
Ac2--10 to 16 inches; grayish brown (10YR 5/2) very paragravelly ashy coarse sandy loam, very dark gray (10YR 3/1) moist; weak medium subangular blocky structure parting to weak fine granular; soft, very friable, non-sticky and slightly plastic; common very fine, fine and medium roots, few coarse roots; many very fine interstitial pores; 25 percent paragravel, trace cobbles and 10 percent stones and boulders; common fine and medium distinct brown (7.5YR 4/3) iron-manganese nodules in matrix, faint dark gray (10YR 4/1) moist; common fine prominent black (2.5Y 2.5/1) manganese nodules in matrix, faint black (2.5Y 2.5/1) moist; common fine prominent strong brown (7.5YR 5/6) iron masses in matrix, absent moist and freshly exposed, prominent brown (7.5YR 4/4) dried and remoistened; slightly acid (pH 6.4). (4 to 20 inches thick)
2Ac3--16 to 30 inches; grayish brown (10YR 5/2) extremely stony ashy coarse sandy loam, very dark brown (10YR 2/2) moist; weak coarse subangular blocky structure; soft, very friable, non-sticky and non-plastic; common very fine roots, few fine roots; many fine interstitial pores; 5 percent gravel, 40 percent cobbles, 40 percent stones and boulders; common fine and medium brown (7.5YR 4/3) iron-manganese nodules in matrix, distinct dark gray (10YR 4/1) moist; many fine prominent black (2.5Y 2.5/1) manganese nodules in matrix, faint black (2.5Y 2.5/1) moist; few fine prominent strong brown (7.5YR 5/6) iron masses in matrix, absent moist and freshly exposed, prominent brown (7.5YR 4/4) dried and remoistened; slightly acid (pH 6.4). Based on landscape position and parent material, it is assumed this horizon extends to a depth of over 60 inches.
TYPE LOCATION: Klamath County, Oregon, about 7 miles east and 11 miles south of Chemult; about 2100 feet east and 40 feet south of the northwest corner of section 17, T. 29 S., R. 9 E. (Latitude 43 degrees 3 minutes 56 seconds North, 121 degrees 33 minutes 31 seconds West)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 41 to 47 degrees F
Mean winter soil temperature - 32 to 35 degrees F
Mean summer soil temperature - 50 to 56 degrees F
Depth to aquic conditions - 1/2 to 4 inches
A horizon
Thickness: 1/2 to 4 inches
Hue: 7.5YR, 10YR or 2.5Y dry or moist
Value: 3 or 4 dry; 2, 2.5 or 3 moist
Chroma: 1 or 2 dry or moist
Paragravel content: 0 to 15 percent
Rock fragment content: 0 to 10 percent
Pebble content: 0 to 5 percent
Cobble content: 0 to 5 percent
Stone or boulder content: 0 to 5 percent
Organic matter content: 10 to 20 percent
Volcanic glass content: 50 to 90 percent in the .02 to 2.0 mm fraction
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 35 percent
Redoximorphic features: absent or few, fine iron masses: absent or few, fine manganese masses
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
Ac1 horizon
Depth to: 1/2 to 4 inches
Thickness: 1 to 10 inches
Hue: 7.5YR, 10YR or 2.5Y dry or moist
Value: 4 or 5 dry; 2, 2.5 or 3 moist
Chroma: 1, 2 or 3 dry; 1 or 2 moist
Texture: ashy coarse sandy loam or ashy sandy loam
Paragravel content: 0 to 15 percent
Rock fragment content: 0 to 15 percent
Pebble content: 0 to 10 percent
Cobble content: 0 to 5 percent
Stone or boulder content: 0 to 5 percent
Organic matter content: 6 to 10 percent
Volcanic glass content: 50 to 90 percent in the 0.02 to 2.0 mm fraction
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 35 percent
Redoximorphic features: absent to many, fine iron masses; common to many, fine manganese nodules; few to many, fine manganese masses
Other - few to many, discontinuous lens or strata, 0 to 10 inches cumulative thickness of ashy loamy coarse sand with 15 to 60 percent pumice paragravel, moderately or highly decomposed plant material, or diatomaceous silt loam
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
Ac2 horizon
Depth to: 2 to 14 inches
Thickness: 4 to 20 inches
Hue: 10YR or 2.5Y dry, 10YR moist
Value: 5 or 6 or dry; 2, 3 or 4 moist
Chroma: 1, 2 or 3 dry or moist
Paragravel content: 5 to 35 percent
Rock fragment content: 0 to 35 percent
Cobble content: 0 to 20 percent
Stone or boulder content: 0 to 35 percent
Organic matter content: 2 to 8 percent
Volcanic glass content: 50 to 90 percent in the 0.02 to 2.0 mm fraction
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 35 percent
Redoximorphic features: absent or common, fine or medium transitory iron masses; common or many, fine manganese nodules; few to common, fine or medium iron-manganese nodules
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
2Ac3 horizon
Depth to: 10 to 20 inches
Thickness: undetermined (observed greater than 2 inches to greater than 20 inches)
Hue: 10YR dry, 10YR or 2.5Y moist
Value: 5 or 6 dry; 2, 3 or 4 moist
Chroma: 2 or 3 dry; 1, 2 or 3 moist
Texture: ashy coarse sandy loam or ashy loamy coarse sand
Paragravel content: 0 to 10 percent (well graded, pumice and iron-manganese nodules)
Rock fragment content: 60 to 85 percent (basalt)
Pebble content: 0 to 10 percent
Cobble content: 0 to 40 percent
Stone or boulder content: 40 to 70 percent
Organic matter content: 2 to 8 percent
Volcanic glass content: 50 to 90 percent in the 0.02 to 2.0 mm fraction
Ammonium oxalate extractable Al plus 1/2 Fe: 0.4 to 1.0 percent
Phosphate retention: 25 to 35 percent
Redoximorphic features: absent to common, fine or medium transitory iron masses; many, fine or medium manganese nodules; common or many, fine or medium iron-manganese nodules
Reaction: moderately acid to neutral (pH 5.6 to 7.3)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landscape - lava plateau
Landform - marrow flood plains
Elevation - 4560 to 5415 feet
Slope- 1 to 15 percent
Parent material - alluvium from Mt Mazama pumice over colluvium from basalt
Climate - cold, moist winters and cool, dry summers are common
Mean annual air temperature - 41 to 45 degrees F
Mean January air temperature - 25 to 27 degrees F
Mean July air temperature - 57 to 60 degrees F
Mean annual precipitation - 20 to 28 inches
Frost-free period - 0 to 25 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lapine, Cosbie and Stirfry soils. Lapine soils are on adjacent plateaus. They formed in volcanic ash and pumice, are excessively drained and have a xeric moisture regime. Cosbie soils are in nearby drainageways. They have a layer of limnic soil material, diatromaceous earth with n Value of greater than 0.7. Stirfry soils are in nearby drainageways. They have histic epipedons greater than 51 inches thick.
DRAINAGE AND PERMEABILITY:
Drainage - poorly drained
Permeability - moderately slow
Runoff- high
Flooding - frequent with long duration
Ponding - none
Water table - an apparent water table is at its uppermost limit from February to July.
USE AND VEGETATION: Mesquito soils are used for wildlife habitat, watershed and recreation. The potential natural plant community is the ponderosa pine/common snowberry-floodplain plant association (CPS5-11).
DISTRIBUTION AND EXTENT: Klamath County, Oregon; MLRA 6. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Winema National Forest, Klamath County, Oregon, 2001
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Andic soil properties - from 0 to 30 inches (the A, Ac1, Ac2 and 2Ac3 horizons)
Lithologic discontinuity - 16 inches
Particle-size control section - from 0 to 39 inches (the A, Ac1, Ac2 and 2Ac3 horizons and portion of underlying layers)
Aquic conditions - endosaturation on 7 September 1999 from 20 to 30 inches (portion of the 2Ac3 horizon)
Moisture regime - aquic
Temperature regime - cryic
These soils may have either an ochric or mollic epipedon. They may also have or lack a cambic horizon.
ADDITIONAL DATA: This pedon description is in NASIS pedon with Site ID 99-JFD-06.