LOCATION ZAPADNI AK
Established Series
Rev. MJM/JPM
02/2022
ZAPADNI SERIES
The Zapadni series consists of very deep, well-drained soils formed in sandy alluvial deposits with an admixture near the surface of medium textured material derived from scoria or other volcanic pyroclastics and basalt. Zapadni soils are on strand lines occurring on footslopes of dipslopes of rocky uplands and on volcanic cones. Slopes range from 1 to 8 percent. Mean annual air temperature is about 35 degrees F., and the average annual precipitation is about 24 inches.
TAXONOMIC CLASS: Sandy, mixed Andic Haplocryods
TYPICAL PEDON: Zapadni fine sandy loam - under forbs and grass vegetation at 120 feet elevation (39 m)(All colors are for moist soil)
Oe - 0 to 2 inches (0 to 5 cm); dark brown (7.5YR 3/4) peat; common fine and medium roots; moderately acid (pH 5.8); clear smooth boundary. (2 to 4 inches thick)
AE - 2 to 6 inches (5 to 14 cm); very dark brown (7.5YR 2.5/2) and very dark gray (7.5YR 3/1) fine sandy loam; moderate medium subangular blocky structure parting to moderate thin platy structure; friable; non-sticky and non-plastic; common fine and few medium roots; non-smeary; moderately acid (pH 5.9); clear smooth boundary. (2 to 4 inches thick)
Bs - 6 to 10 inches (14 to 25 cm); dark reddish brown (5YR 3/2) fine sandy loam; weak medium subangular blocky structure; friable; non-sticky and non-plastic; few fine roots; non-smeary; moderately acid (pH 5.9); gradual smooth boundary. (3 to 5 inches thick)
Bw - 10 to 17 inches (25 to 43 cm); dark reddish brown (5YR 3/4) and black (5YR 2/1) loamy sand; weak medium granular structure; very friable; non-sticky and non-plastic; few fine roots; non-smeary; moderately acid (pH 5.9); clear smooth boundary. (5 to 10 inches thick)
2BC - 17 to 30 inches (43 to 75 cm); dark brown (7.5YR 3/3) sand; single grain structure; loose; non-sticky and non-plastic; non-smeary; slightly acid (pH 6.3); clear wavy boundary. (15 to 25 inches thick)
2C - 30 to 71 inches (75 to 180 cm); very dark grayish brown (10YR 3/2) and (2.5Y 3/2) sand; single grain structure; loose; non-sticky and non-plastic; non-smeary; slightly acid (pH 6.3); abrupt smooth boundary. (20 to 40 inches thick)
R - 71 inches (180 cm); basalt bedrock
TYPE LOCATION: Saint Paul Island Alaska; UTM Zone 2, 550152 E and 6337870 N.
RANGE IN CHARACTERISTICS: Thickness of the organic mat ranges from 2 to 4 inches. The weighted average particle size of the control section is sand. Reaction ranges from moderately acid to slightly acid in the profile.
The AE horizon has hue of 5YR or 7.5YR; value moist of 2.5 or 3; and chroma moist of 1 or 2. Texture is loamy fine sand, fine sandy loam, or very fine sandy loam.
The Bs horizon has texture is loamy very fine sand, loamy fine sand, or fine sandy loam. Reaction is moderately to slightly acid
The Bw horizon has hue of 5YR or 7.5YR; value moist of 2 or 3; chroma moist of 1 through 4. Texture is loamy very fine sand, loamy fine sand, or fine sandy loam. Reaction is moderately to slightly acid
The 2BC horizon has reaction of moderately acid to slightly acid
The 2C horizon has hue of 10YR or 2.5Y; and chroma moist from 2 to 4. Reaction is moderately acid to slightly acid.
COMPETING SERIES: none
GEOGRAPHIC SETTING: Zapadni soils formed in sandy alluvial deposits admixed in the upper part with finer textured material weathered from scoria and basalt. They are formed on strand lines on dipslopes and volcanic cones near the coast. Slopes range from 0 to 8 percent. Steeper areas of Zapadni soil may occur on the seaward side of the strand line. The climate is cold maritime. Mean annual air temperature is 35 degrees F., and mean annual precipitation ranges from 18 to 28 inches.
GEOGRAPHICALLY ASSOCIATED SOILS:
Polovina series on plains,
Tsammana series on lower dipslope positions and beach terraces, and
Lukanin series on nearby dunes
DRAINAGE AND PERMEABILITY: Well drained. Slow to moderate runoff. Permeability is moderate over rapid to very rapid.
USE AND VEGETATION: Mostly in grass and forbs dominated by Nootka lupine (Lupinus nootkatensis), Bering hairgrass (Deschampsia cespitosa), and Crowberry (Empetrum nigrum).
DISTRIBUTION AND EXTENT: Saint Paul Island, Alaska. The series is of limited extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: WASILLA, ALASKA
SERIES ESTABLISHED: Saint Paul Island, Alaska, 2000.
REMARKS: Diagnostic layers and features recognized in this profile include: Andic properties in a layer between 7 and 10 inches thick in the upper part, an albic horizon in at least 50 percent of all pedons, and a spodic horizon. Zapadni soils have a lithic contact at greater than 60 inches depth and a cryic temperature regime.
National Cooperative Soil Survey
U.S.A.