Yolo - American Basins (Bailey)
Published: September 22, 2009, 4:36 pm
Updated: September 22, 2009, 4:36 pm
This article has been reviewed by the following Topic Editor:
Mark McGinleyThis subsection is on an alluvial plain adjacent to the lower Sacramento River. Much of it is flooded during the winter or early spring. The climate is hot and subhumid. MLRAs 16e and 17e.
Lithology and Stratigraphy
This subsection contains recent alluvium of stream channel, stream overflow, and alluvial fan deposits. The alluvium is from granitic, volcanic, sedimentary, and metamorphic[ rock sources in mountains around the Sacramento Valley.
Geomorphology
This subsection is on nearly level to very gently sloping stream channels, levees, overflow basins, and alluvial fans. The subsection elevation range is from about 10 to about 40 feet. Fluvial erosion and deposition are the main geomorphic processes.
Soils
The soils are mostly Aquic Xerofluvents; Aeric Haplaquepts; and Cumulic and Vertic Haplaquolls. Pelloxererts and Chromoxererts are common on alluvial fans. The soils are moderately well drained to poorly drained. Soil temperature regimes are thermic, and soil moisture regimes are aquic and xeric.
Vegetation
The predominant natural plant communities are Emergent aquatic communities and Needlegrass grasslands.
Characteristic series by lifeform include:
Wetlands: Bulrush series, Bulrush - cattail series, Cattail series, Sedge series.
Forests and woodlands: California sycamore series, Fremont cottonwood series, Mixed willow series.
Climate
The mean annual precipitation is about 14 to 18 inches. It is practically all rain. Mean annual temperature is about 60° to 62° F. The mean freeze-free period is about 250 to 275 days.
Surface Water
The Sacramento River overflows onto parts of this area and overflowed onto most of the area when it flooded before being controlled by dams, artificial levees, and diversions. Streams drain toward the Sacramento River on alluvial fans and parallel to it in overflow basins. All but the larger streams are generally dry during the summer. There are no lakes, but there is temporary ponding in overflow basins.
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Citation
USFS (Content Source);Mark McGinley (Topic Editor) "Yolo - American Basins (Bailey)". In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). [First published in the Encyclopedia of Earth September 22, 2009; Last revised Date September 22, 2009; Retrieved May 21, 2013 <http://www.eoearth.org/article/Yolo_-_American_Basins_(Bailey)>
This subsection is on an alluvial plain adjacent to the lower Sacramento River. Much of it is flooded during the winter or early spring. The climate is hot and subhumid. MLRAs 16e and 17e.
Lithology and Stratigraphy
This subsection contains recent alluvium of stream channel, stream overflow, and alluvial fan deposits. The alluvium is from granitic, volcanic, sedimentary, and metamorphic[ rock sources in mountains around the Sacramento Valley.
Geomorphology
This subsection is on nearly level to very gently sloping stream channels, levees, overflow basins, and alluvial fans. The subsection elevation range is from about 10 to about 40 feet. Fluvial erosion and deposition are the main geomorphic processes.
Soils
The soils are mostly Aquic Xerofluvents; Aeric Haplaquepts; and Cumulic and Vertic Haplaquolls. Pelloxererts and Chromoxererts are common on alluvial fans. The soils are moderately well drained to poorly drained. Soil temperature regimes are thermic, and soil moisture regimes are aquic and xeric.
Vegetation
The predominant natural plant communities are Emergent aquatic communities and Needlegrass grasslands.
Characteristic series by lifeform include:
Wetlands: Bulrush series, Bulrush - cattail series, Cattail series, Sedge series.
Forests and woodlands: California sycamore series, Fremont cottonwood series, Mixed willow series.
Climate
The mean annual precipitation is about 14 to 18 inches. It is practically all rain. Mean annual temperature is about 60° to 62° F. The mean freeze-free period is about 250 to 275 days.
Surface Water
The Sacramento River overflows onto parts of this area and overflowed onto most of the area when it flooded before being controlled by dams, artificial levees, and diversions. Streams drain toward the Sacramento River on alluvial fans and parallel to it in overflow basins. All but the larger streams are generally dry during the summer. There are no lakes, but there is temporary ponding in overflow basins.
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Yes, Delete This Article
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