LOCATION MOSQUITOPOINT AK
Established Series
SAS/TJR/MPR
05/2022
MOSQUITOPOINT SERIES
Landscape--drift plains, mountain valleys
Landform--depressions
Slope--0 to 5 percent
Parent material--organic material over alluvium or glaciolacustrine deposits
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 0 degrees C
Depth class--very deep
Drainage class--very poorly drained
Soil moisture regime--peraquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy, isotic, euic Terric Cryohemists
TYPICAL PEDON: Mosquitopoint peat in a depression of a plain, on a slope of 1 percent at an elevation of 37 m (The soil was saturated throughout the profile when described on July 13, 2011.)
Oi--0 to 20 cm; peat, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/3) moist; nonsticky and nonplastic; many very fine and fine and common medium roots; very strongly acid (pH 4.6); clear smooth boundary
Oe--20 to 95 cm; mucky peat, brown (7.5YR 4/3) dry, very dark brown (7.5YR 2.5/3) moist; nonsticky and nonplastic; many very fine and fine and few medium roots; moderately acid (pH 5.9); clear smooth boundary
Ag--95 to 105 cm; silt loam, brown (7.5YR 4/2) dry, very dark brown (7.5YR 2.5/2) moist; weak medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; slightly acid (pH 6.5); gradual smooth boundary
Cg--105 to 180 cm; loam, gray (N 6/0) dry, dark gray (N 4/0) moist; massive; moderately hard, firm, nonsticky and nonplastic; 8 percent gravel; neutral (pH 7.3)
TYPE LOCATION: Dillingham Census Area, Alaska, about 3 km north of the village of Aleknagik; latitude 59.303333 degrees north, longitude 158.6244444 degrees west, datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 3 degrees C
Soil moisture control section--saturated in all parts during the growing season (peraquic moisture regime)
Aquic conditions--throughout the profile
Thickness of hemic soil material--30 to 100 cm
Organic soil layers
*CaCl pH--4.5 or more in at least one organic soil layer
Particle-size control section
*Clay content--3 to 40 percent
*Sand content--20 to 70 percent
*Gravel content--0 to 25 percent
*Sodium fluoride pH--greater than or equal to 8.4
*Ratio of 1500 kPa water to measured clay--greater than or equal to 0.6
Oi horizon
Hue--10YR, 7.5YR
Value--2 to 4 moist, 4 or 6 dry
Chroma--2 to 4 moist
Reaction--3.7 to 5.8
Organic matter content--80 to 100 percent
Sodium pyrophosphate color--10YR 8/1, 10YR 8/2, 10YR 8/3
Volume of unrubbed fibers--92 to 98 percent
Volume of rubbed fibers--74 to 80 percent
Thickness--10 to 50 cm
Oe horizon
Hue--10YR, 7.5YR
Value--2 to 3 moist, 4 or 5 dry
Chroma--2 or 3 moist
Reaction--3.9 to 6.5
Organic matter content--50 to 90 percent
Sodium pyrophosphate color--10YR 6/4, 10YR 7/3
Volume of unrubbed fibers--40 to 64 percent
Volume of rubbed fibers--17 to 50 percent
Thickness--30 to 100 cm
Ag horizon
Hue--10YR, 2.5Y, 2.5YR, 7.5YR
Value--2.5 to 6 moist, 4 to 8 dry
Chroma--1 to 3 moist
Fine-earth texture--silt loam, sandy loam
Gravel content--0 to 10 percent
Clay content--3 to 10 percent
Reaction--5.5 to 6.5
Thickness--5 to 60 cm
Cg horizon
Hue--10YR, 2.5Y, 5Y, neutral
Value--2 to 6 moist, 4 to 8 dry
Chroma--0 to 4 moist
Fine-earth texture--sandy loam, sandy clay loam, loam, silt loam, clay loam
Gravel content--0 to 25 percent
Clay content--3 to 40 percent
Reaction--5.5 to 7.3
Thickness--more than 30 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--5 to 820 m
Climate--warm, moist summers; cold, moist winters
Mean annual precipitation--600 to 1700 mm
Mean annual air temperature-- -3.2 to 1.8 degrees C
Frost-free period--75 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Mitlak--umbric epipedon; cambic horizon; andic soil properties; aquic conditions below a depth of 50 cm; talfs of plains
Nagugun--ochric epipedon; andic soil properties; spodic horizon; no aquic conditions; rises on glaciated plains
Pungokepuk--ochric epipedon; andic soil properties; spodic horizon; no aquic conditions; swales
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--very poorly drained
Ponding--occasional or brief, frequent or long
Saturation in normal years--at the surface throughout the year
Saturated hydraulic conductivity (Ksat)--moderately high or high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation, subsistence
Potential natural vegetation--bog rosemary, dwarf birch, water sedge, looseflower alpine sedge, roundleaf sundew, black crowberry, marsh Labrador tea, sweetgale, cloudberry, alpine bulrush, tufted bulrush, bog blueberry, white cottongrass, water horsetail, sphagnum moss, manyflower sedge
DISTRIBUTION AND EXTENT: Southwest Alaska; MLRAs 237 and 236; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Togiak National Wildlife Refuge-Ahklun Mountains Area, Alaska; 2019
REMARKS:
Diagnostic horizons and other features in this pedon
*Control section--zone from 0 to 130 cm
*Particle-size control section--zone from 95 to 130 cm
*Surface tier--zone from 0 to 30 cm
*Subsurface tier--zone from 30 to 90 cm
*Bottom tier--zone from 90 to 130 cm
*Hemic soil material--zone from 20 to 95 cm
*Aquic conditions--zone from 0 to 180 cm
National Cooperative Soil Survey
U.S.A.