LOCATION BELUGA AK

Established Series
Rev. DVP/JPM
5/84

BELUGA SERIES

The Beluga series consists of very deep, poorly drained soils formed in stratified alluvium and colluvium over clayey sediments. Beluga soils occur on coalesced alluvial fans. Slopes range from 0 to 20 percent. Mean annual temperature is about 36 degrees F., and the mean annual precipitation is about 24 inches.

TAXONOMIC CLASS: Coarse-loamy, mixed, nonacid Typic Cryaquents

TYPICAL PEDON: Beluga silt loam - under forest and grass understory. (All colors for moist soil unless otherwise stated)

Oe -- 5 to 0 inches; dark reddish brown (5YR 2/2) partially decomposed straw and woody mat with mycelia in the lower part.

A -- 0 to 2 inches; very dark grayish brown (10YR 3/2) silt loam with pockets of dark grayish brown (10YR 4/2); moderate fine granular structure; very friable; common roots; streaks of burned organic matter near bottom of horizon; strongly acid; abrupt wavy boundary.

C1g -- 2 to 8 inches; dark grayish brown (10YR 4/2) silt loam; moderate fine granular structure; very friable; common medium distinct dark yellowish brown (10YR 4/4) mottles; common roots; medium acid; abrupt wavy boundary.

C2g -- 8 to 13 inches; dark grayish brown (10YR 4/2) fine sandy loam; weak thin platy structure; very friable; common large distinct dark yellowish brown (10YR 4/4) mottles; common roots; medium acid; abrupt wavy boundary.

C3g -- 13 to 21 inches; gray (5Y 5/1) silt loam; weak fine platy structure; friable, slightly sticky and nonplastic; common medium distinct dark yellowish brown (10YR 4/4) mottles; few roots; thin stratas of fine sandy loam; medium acid; abrupt wavy boundary.

C4g -- 21 to 27 inches; greenish gray (5GY 5/1) fine sandy loam; weak thin platy structure; very friable, nonsticky and nonplastic; common medium distinct olive brown (2.5Y 4/4) mottles; few roots; thin layer of gravelly silt loam with red shale fragments; medium acid; abrupt smooth boundary.

2Cg -- 27 to 60 inches; gray (5Y 5/1) silty clay loam; massive; firm; common large prominent yellowish brown (10YR 5/6) and dark red (2.5YR 3/6) mottles; firm dark red decomposing shale fragments; few fine pores and vesicles; medium acid; underlying sediments are layered fine sandy loam, silt loam, and shaly silt loam.

TYPE LOCATION: Homer-Ninilchik Area, Alaska. SE 1/4, SE 1/4, Section 17, T. 6 S., R. 13 W., Seward Meridian. Approximately 1 mile east of Homer.

RANGE IN CHARACTERISTICS: Depth to the massive, firm underlying material ranges from 20 to more than 40 inches, but is normally about 30 inches. Thin strata of sand and silty clay loam, and angular fragments of shale and lignite may occur at any depth. The control section has, by weighted average, less than 18 percent clay with more than 15 percent fine or coarser sand. pH is more than 5.5 (1:1,H20) in parts of the control section. Mottles are normally present throughout the entire profile.

A horizons are lacking in some profiles.

The C horizons have hue ranging from 10YR through 5GY, value of 4 or 5 moist, and chroma of 1 or 2 moist.
COMPETING SERIES: This is the Moose River series in the same family and the Clam Gulch, Coal Creek, Eshamy(T), and Wasilla series. Moose River soils do not have firm underlying material within the control section. Coal Creek soils have less than 15 percent fine or coarser sand in the control section. Clam Gulch soils have massive, fine textured underlying material within 20 inches of the surface. Wasilla soils have more than 18 percent clay throughout the control section.

GEOGRAPHIC SETTING: The Beluga series occur on coalesced alluvial fans below high escarpments. These soils formed in alluvium and colluvium derived from clayey sediments exposed in the escarpments. The alluvium and colluvium overlie these sediments. The climate is maritime with cool summers and long moderately cold winters. The average annual temperature is about 36 degrees F., and the average annual precipitation is about 24 inches.

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Salamatof and Mutnala soils. Salamatof soils are organic soils in muskegs. Mutnala soils are well drained, have spodic horizons, and occur on adjacent upland areas.

DRAINAGE AND PERMEABILITY: Poorly drained. Very slow to medium runoff. Permeability is moderate in the upper part of the profile and slow in the silty clay loam underlying material. Most areas are influenced by seepage.

USE AND VEGETATION: The native vegetation is bluejoint grass, alder, willow, fireweed, and forbs. Some areas are forested with Sitka spruce and paper birch. Some areas are used for pasture, hay, vegetables, and residential development.

MLRA OFFICE RESPONSIBLE: Anchorage, Alaska

SERIES ESTABLISHED: Homer-Ninilchik Area, Alaska. 1966.

REMARKS: Diagnostic horizons and features recognized in this soil include: saturation with water at some time of the year; mottling and low chromas within 20 inches of the surface; assumed sulfidic materials within 20 inches of the surface; weighted average of fine-loamy from 10 to 40 inches. pH is more than 5.5 (1:1, H20) throughout the control section.


NATIONAL COOPERATIVE SOIL SURVEY
U.S.A.

 


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04 May 2007 10:17