LOCATION ZANGO OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Lithic Dystrudepts
TYPICAL PEDON: Zango very gravelly sandy loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; salal leaves, stems of common beargrass and western brackenfern.
A--1 to 11 inches; gray (10YR 5/1) very gravelly sandy loam, white (10YR 8/1) dry; weak fine and medium granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine to medium roots; many very fine irregular pores; 40 percent gravel; moderately acid (pH 5.6); clear wavy boundary. (5 to 10 inches thick)
Bw--11 to 18 inches; dark brown (7.5YR 4/4) very gravelly loam, pink (7.5YR 7/4) dry; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine to medium roots; common very fine and fine tubular pores; 45 percent gravel; strongly acid (pH 5.4); abrupt wavy boundary. (5 to 12 inches thick)
R--18 inches; hard welded tuff.
TYPE LOCATION: Douglas County, Oregon. The site is located along the BLM 25.1 road; 1 mile up from the 1.0 road; 1,600 feet east and 1,100 feet south of the NW corner of sec. 30, T. 24 S., R. 1 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 47 to 55 degrees F. The soils have a udic moisture regime but have a short dry period of less than 45 consecutive days during the summer months. Depth to bedrock is 10 to 20 inches. The particle-size control section has 35 to 60 percent rock fragments dominantly gravel and 18 to 30 percent clay. The hue is 10YR or 7.5YR.
The A horizon has value of 4 through 6 moist, 6 through 8 dry, and chroma of 1 through 3 moist or dry. It is strongly to moderately acid. It has 0 to 10 percent cobbles and 20 to 45 percent gravel.
The Bw horizon has value of 4 or 5 moist, 6 through 8 dry, and chroma of 3 through 5 moist or dry. It is very gravelly clay loam, very cobbly loam or very gravelly loam with 18 to 30 percent clay. It has 0 to 25 percent cobbles and 30 to 45 percent gravel.
COMPETING SERIES: These are the Arnot, Catlett, Dimal, Klinesville, Nassau, Umpcoos, Unicoi and Weikert soils. Arnot soils have developed in glacial till and are channery throughout the solum. Catlett soils have an E horizon and have a shaly textures. Dimal soils have channery and flaggy textures. Klinesville, Nassau and Weikert soils have shaly textures. Umpcoos soils have less than 18 percent clay in the B horizon. Unicoi soils have angular arkose or arkosic sandstone fragments in the profile.
GEOGRAPHIC SETTING: The Zango soils are on very steep slopes, usually headwalls and dissected side slopes in mountains. Elevation is 500 to 3,200 feet. Slopes are 60 to 90 percent. The soils formed in colluvium weathered from tuff, breccias, and andesites. The climate is characterized by cool moist winters and warm dry summers. The mean annual precipitation is 60 to 90 inches. The mean January temperature is 37 degrees F, mean July temperature is 63 degrees F, and the mean annual temperature is 45 to 53 degrees F. The frost-free period is 140 to 220 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Blachly, Holderman, Honeygrove, Kilchis, Klickitat, Shivigny, and Winberry series. Blachly and Honeygrove are in the fine family and are over 60 inches deep. Klickitat soils have umbric epipedons and are 40 or more inches deep to a lithic contact. Kilchis soils have an umbric epipedon and hue redder than 7.5YR in the B horizon. Shivigny soils have an argillic horizon and are in the clayey-skeletal family. Winberry soils have a cryic soil temperature regime.
DRAINAGE AND PERMEABILITY: Excessively drained; rapid and very rapid runoff; moderate permeability.
USE AND VEGETATION: Timber production, wildlife, and watershed. Native vegetation is Douglas fir, western hemlock, western redcedar, salal, vine maple, red huckleberry, and western swordfern.
DISTRIBUTION AND EXTENT: Western slopes of the Cascade Mountains in Oregon. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Linn County, Oregon, 1983.
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