Dolason soil series
A profile of a Dolason soil. These soils are in prairies of the Bald Hills area. The thick, dark surface layer is the dominant feature of soils that form under grasses and forbs. (Soil Survey of Redwood National and State Parks, California; by Joseph P. Seney and Alaina C. Frazier, Natural Resources Conservation Service, and James H. Popenoe, Department of the Interior, National Park Service, Retired)
The Dolason series consists of very deep, well drained soils formed in colluvium and residuum derived from siltstone, mudstone, and sandstone. Dolason soils are on mountains and have slopes of 9 to 75 percent. The mean annual precipitation is about 2290 millimeters (90 inches) and the mean annual temperature is about 11 degrees C (52 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Humixerepts
Soil Moisture: The soil is dry in all parts in the moisture control section from about July 10 to September 20, and is moist in all parts from about October 1 to June 1. The soils have a xeric moisture regime.
Soil Temperature: The mean annual soil temperature is 10 to 15 degrees C (50 to 59 degrees F). The difference between mean summer and mean winter temperature is 6 to 10 degrees C. The soils have a mesic soil temperature regime.
Umbric epipedon: 50 to 100 centimeters thick
Reaction: very strongly through moderately acid, and base saturation, by ammonium acetate, is less than 60 percent.
Surface fragments: 0 to 12 percent gravel and 0 to 3 percent cobble
Particle-Size Control Section (weighted average):
Rock fragments: 5 to 35 percent gravel and 0 to 10 percent cobbles.
Clay content: 18 to 25 percent clay.
This soil has been used for livestock grazing, recreation, wildlife habitat, and watershed. In a few areas it has been planted to commercial timber. Naturalized annual and perennial grasses and forbs include tall oatgrass, annual vernal grass, bentgrass, California oatgrass, blue wildrye, bristly dogstail grass, soft brome, wild oat, slender oat, western brackenfern, hairy catsear, common sheep sorrel, miniature lupine, pale flax, common yarrow, and California poppy. In the southern part of the range, scattered coyote brush can be present.Invasion by Douglas fir and succession to forest is in progress in many areas.
DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.
For additional information about the survey area, visit:
www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/california/CA6...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/D/DOLASON.html
For acreage and geographic distribution, visit:
Dolason soil series
A profile of a Dolason soil. These soils are in prairies of the Bald Hills area. The thick, dark surface layer is the dominant feature of soils that form under grasses and forbs. (Soil Survey of Redwood National and State Parks, California; by Joseph P. Seney and Alaina C. Frazier, Natural Resources Conservation Service, and James H. Popenoe, Department of the Interior, National Park Service, Retired)
The Dolason series consists of very deep, well drained soils formed in colluvium and residuum derived from siltstone, mudstone, and sandstone. Dolason soils are on mountains and have slopes of 9 to 75 percent. The mean annual precipitation is about 2290 millimeters (90 inches) and the mean annual temperature is about 11 degrees C (52 degrees F).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Humixerepts
Soil Moisture: The soil is dry in all parts in the moisture control section from about July 10 to September 20, and is moist in all parts from about October 1 to June 1. The soils have a xeric moisture regime.
Soil Temperature: The mean annual soil temperature is 10 to 15 degrees C (50 to 59 degrees F). The difference between mean summer and mean winter temperature is 6 to 10 degrees C. The soils have a mesic soil temperature regime.
Umbric epipedon: 50 to 100 centimeters thick
Reaction: very strongly through moderately acid, and base saturation, by ammonium acetate, is less than 60 percent.
Surface fragments: 0 to 12 percent gravel and 0 to 3 percent cobble
Particle-Size Control Section (weighted average):
Rock fragments: 5 to 35 percent gravel and 0 to 10 percent cobbles.
Clay content: 18 to 25 percent clay.
This soil has been used for livestock grazing, recreation, wildlife habitat, and watershed. In a few areas it has been planted to commercial timber. Naturalized annual and perennial grasses and forbs include tall oatgrass, annual vernal grass, bentgrass, California oatgrass, blue wildrye, bristly dogstail grass, soft brome, wild oat, slender oat, western brackenfern, hairy catsear, common sheep sorrel, miniature lupine, pale flax, common yarrow, and California poppy. In the southern part of the range, scattered coyote brush can be present.Invasion by Douglas fir and succession to forest is in progress in many areas.
DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.
For additional information about the survey area, visit:
www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/california/CA6...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/D/DOLASON.html
For acreage and geographic distribution, visit: