Trailhead soil and landscape
Soil profile: A profile of a Trailhead soil. These very deep soils have distinctive strong red subsurface layers. They are on stable ridges and upper mountain slopes. (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)
Landscape: An area of Trailhead, 15 to 30 percent slopes. The dominant vegetation consists of redwood, Douglas-fir, western hemlock, tanoak, California huckleberry, and Pacific rhododendron.
The Trailhead series consists of very deep, well drained soils formed in residuum and colluvium derived from schist and sandstone. Trailhead soils are on mountains and have slopes of 0 to 50 percent. The mean annual precipitation is about 2160 millimeters (85 inches) and the mean annual temperature is about 11 degrees C (52 degrees F).
TAXONOMIC CLASS: Fine, parasesquic, isomesic Typic Palehumults
Soil Moisture: The soil is usually moist in all parts in the soil moisture control section in most years, but becomes nearly dry in the upper part from about September 15 to October 15 in most years. The soils have an Udic moisture regime.
Soil Temperature: The mean annual soil temperature is 10 to 13 degrees C (50 to 55 degrees F). The difference between mean summer and mean winter temperature is 2 to 4 degrees C.
Organic Matter: There is 12 to 25 kg per square meter of organic carbon to a depth of one meter.
CEC to clay ratio is 16 to 24 meq/100g in the major part of the argillic horizon.
Reaction is strongly or very strongly acid throughout. Base saturation is 5 to 35 percent between depths of 25 to 202 centimeters.
Surface fragments: 0 to 10 percent gravel
Particle-Size Control Section (weighted average):
Rock fragments: 0 to 15 percent gravel
Clay content: 40 to 60 percent clay
Note: There is 91 percent resistant minerals in the very fine sand fraction. The very fine sand and silt fractions are mostly quartz, although coarser sand and gravel fractions are predominantly schist fragments. Vermiculite, kaolinite, and chlorite are identifiable clay minerals by x-ray analysis. Although vermiculite is a major clay mineral, the CEC is kept low by the combined influence of ferric iron, gibbsite, and kaolinite.
USE AND VEGETATION: This soil has been used for commercial timber and is used for recreation, wildlife and watershed. Natural vegetation consists of redwood, Douglas-fir, western hemlock, tanoak, huckleberry, and Pacific rhododendron.
DISTRIBUTION AND EXTENT: California 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/T/TRAILHEAD.html
For acreage and geographic distribution, visit:
casoilresource.lawr.ucdavis.edu/see/#trailhead
Trailhead soil and landscape
Soil profile: A profile of a Trailhead soil. These very deep soils have distinctive strong red subsurface layers. They are on stable ridges and upper mountain slopes. (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)
Landscape: An area of Trailhead, 15 to 30 percent slopes. The dominant vegetation consists of redwood, Douglas-fir, western hemlock, tanoak, California huckleberry, and Pacific rhododendron.
The Trailhead series consists of very deep, well drained soils formed in residuum and colluvium derived from schist and sandstone. Trailhead soils are on mountains and have slopes of 0 to 50 percent. The mean annual precipitation is about 2160 millimeters (85 inches) and the mean annual temperature is about 11 degrees C (52 degrees F).
TAXONOMIC CLASS: Fine, parasesquic, isomesic Typic Palehumults
Soil Moisture: The soil is usually moist in all parts in the soil moisture control section in most years, but becomes nearly dry in the upper part from about September 15 to October 15 in most years. The soils have an Udic moisture regime.
Soil Temperature: The mean annual soil temperature is 10 to 13 degrees C (50 to 55 degrees F). The difference between mean summer and mean winter temperature is 2 to 4 degrees C.
Organic Matter: There is 12 to 25 kg per square meter of organic carbon to a depth of one meter.
CEC to clay ratio is 16 to 24 meq/100g in the major part of the argillic horizon.
Reaction is strongly or very strongly acid throughout. Base saturation is 5 to 35 percent between depths of 25 to 202 centimeters.
Surface fragments: 0 to 10 percent gravel
Particle-Size Control Section (weighted average):
Rock fragments: 0 to 15 percent gravel
Clay content: 40 to 60 percent clay
Note: There is 91 percent resistant minerals in the very fine sand fraction. The very fine sand and silt fractions are mostly quartz, although coarser sand and gravel fractions are predominantly schist fragments. Vermiculite, kaolinite, and chlorite are identifiable clay minerals by x-ray analysis. Although vermiculite is a major clay mineral, the CEC is kept low by the combined influence of ferric iron, gibbsite, and kaolinite.
USE AND VEGETATION: This soil has been used for commercial timber and is used for recreation, wildlife and watershed. Natural vegetation consists of redwood, Douglas-fir, western hemlock, tanoak, huckleberry, and Pacific rhododendron.
DISTRIBUTION AND EXTENT: California 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/T/TRAILHEAD.html
For acreage and geographic distribution, visit:
casoilresource.lawr.ucdavis.edu/see/#trailhead