LOCATION ORGTER AK
Established Series
SAS/TJR/SJN
05/2022
ORGTER SERIES
The Orgter series consists of very deep, very poorly drained soils formed in organic material over alluvium on terraces. Slopes range from 0 to 3 percent. The mean annual precipitation is about 760 millimeters and the mean annual air temperature is about 0.4 degrees C.
TAXONOMIC CLASS: Loamy, isotic, dysic Terric Cryohemists
TYPICAL PEDON: Orgter peat, located on a stream terrace with a slope of 1 percent and elevation of 42 meters; when described on August 12th, 2010 the soil was wet throughout (Colors are for moist soil unless otherwise noted)
Oi--0 to 8 cm; peat; nonsticky, nonplastic; many fine roots, common medium roots, and common very fine roots; extremely acid (pH 4.1); gradual smooth boundary
Oe--8 to 95 cm; mucky peat; nonsticky, nonplastic; many fine roots, common medium roots, and many very fine roots; extremely acid (pH 4.1); gradual smooth boundary
A--95 to 115 cm; very dark grayish brown (10YR 3/2) stratified mucky silt loam; 40 percent sand; 55 percent silt; 5 percent clay; weak medium granular structure; friable, nonsticky, nonplastic; common very fine roots; 1 percent gravel; very strongly acid (pH 4.7); clear smooth boundary
ACg--115 to 183 cm; very dark grayish brown (2.5Y 3/2) stratified sandy loam; 60 percent sand; 35 percent silt; 5 percent clay; weak coarse subangular blocky structure; nonsticky, nonplastic; very strongly acid (pH 4.8)
TYPE LOCATION: Dillingham Census Area, Alaska; 1 km northwest of the Village of New Stuyahok; 59.458889 degrees north latitude and 157.338333 degrees west longitude.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 0.6 to 2.2 degrees C (cryic soil temperature regime)
Soil moisture control section - Soil is saturated at the surface for much of the growing season in most years (aquic soil moisture regime)
Thickness of hemic material - 32 to 87 cm
Depth to aquic conditions - 0 cm
Depth to reduced matrix - 80 to 170 cm
All mineral horizons-
Reaction - 4.7 to 5.6
Particle-size control section-
Clay content - 3 to 8 percent
Rock fragments - 0 to 1 percent
Oi horizon
Thickness - 8 to 35 cm
Organic matter content - 85 to 95 percent
Sodium pyrophosphate color - 10YR 8/1, 10YR 8/2, or 10YR 8/3
Volume of unrubbed fibers - 92 to 98 percent
Volume of rubbed fibers - 74 to 80 percent
Oe horizon
Thickness - 32 to 87 cm
Organic matter content - 80 to 90 percent
Sodium pyrophosphate color - 10YR 6/4 or 10YR 7/3
Volume of unrubbed fibers - 40 to 65 percent
Volume of rubbed fibers - 35 to 60 percent
A horizon
Hue - 7.5YR to 2.5Y
Value - 2 to 4
Chroma - 1 or 2
Fine earth texture - Silt loam, stratified sandy loam, or stratified mucky silt loam
Clay content - 4 to 8 percent
Reaction - 4.7 to 5.6
Rock fragments - 0 to 1 percent subrounded gravels
Thickness - 20 to 62 cm
ACg horizon
Hue - 10YR to 5Y
Value - 3
Chroma - 1 or 2
Fine earth texture - Stratified sandy loam, stratified silt loam, or sand
Clay content - 3 to 7 percent
Reaction - 4.8 to 5.6
Rock fragments - 0 percent
Thickness - 13 to 103 cm
COMPETING SERIES: There are no competing series
GEOGRAPHIC SETTING:
Parent material - Mossy organic material over coarse-loamy alluvium
Landform - Stream terraces
Slope - 0 to 1 percent
Elevation - 40 to 65 meters
Climate - Cool summers; cold winters, August and September are the wettest months
Mean annual precipitation - 745 to 777 mm
Mean annual air temperature - 0.4 to 0.5 degrees C
Frost free duration - 85 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ungiuq - Formed in organic parent material over loamy and gravelly alluvium, drainageways
Iowithla - Moderately well drained, formed in organic material over loamy and sandy alluvium, flood plains
Kokwok - Well drained, formed in organic material over loamy and sandy alluvium, flood plains
Ekwok - Well drained, formed in loamy eolian deposits, rises on plains
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: (Ksat)
Drainage class - Very poorly drained
Saturation in normal years - At the soil surface for most months
Flooding - None
Ponding - Frequent and very long
Ksat - Moderately high throughout the soil profile
USE AND VEGETATION:
Use - Wildlife habitat
Potential natural vegetation - Western Alaska maritime scrubland composed of dwarf birch, bog blueberry, sweetgale, cottongrasses, sedges, and sphagnum moss
DISTRIBUTION AND EXTENT: Bristol Bay Lowlands; MLRA 236; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Nushagak-Mulchatna Watershed Soil Survey, Dillingham Census Area, Alaska, 2019
REMARKS:
Particle-size control section - 95 to 130 cm
Soil moisture regime - Aquic
Hemic soil material - Oe horizon
Aquic soil conditions - All soil horizons
Reduced matrix - ACg horizon
National Cooperative Soil Survey
U.S.A.