|
X12/31%X20,01 'MON1131140 FAX 209946 6 0 36 111I I I I I I IuIluI I UI I ISTOCKTION
<br /> I EI I I
<br /> CTR IIIIII I II I III If IIIII ��a 003
<br /> Fl! _
<br /> 156 Soil Survey
<br />€
<br /> Fj
<br /> topography, ve etation land use, and genera!
<br /> States, shows that the chief limitation is climate that is climate, vegetation,
<br /> very cold or very dry. type of farming. Farts of four of these nationally
<br /> In class I there are no subclasses because the soils designated areas are In the county. These areas and
<br /> of this class have taw limitations. Class V contains only their numbers are Central'Califomia Coast Range,
<br /> the subclasses indicated by w, s, or cbecause the sons MLRA-15; California Delta, MLRA•16; Sacramento and
<br /> in class V are subject to little or no erosion. They have San Joaquin Valley, MLRA-17; and Sierra Nevada
<br /> other limitations that restrict their use to pasture, Foothills, MLRA-18. The major land resource area
<br /> ! 1 rangeland, wildlife habitat, or recreation. number is added in parentheses after the land
<br /> Capability units are soil groups within a subclass. capability class,.subclass, or unit designation at the end
<br /> The soils in a capability unit are enough alike to be of each map unit description in the section "Detailed
<br /> crops suited to the same s and pasture plants, to require Soil Map Units."
<br /> i P
<br /> similar management, and to have similar productivity. A soil in one resource area may have characteristics
<br /> Capability units are generally designated by adding an similar to those of a soil In another resource area and
<br /> Arabic numeral to the subclass symbol, for example, have the same capability symbol, but the climate,
<br /> lls-5 and i!w-2. The numbers used to designate units vegetation, suitable crops, and needed management
<br /> within the subclasses are as folfows: practices may differ. For example, both capability unit
<br /> 0. Indicates limitations caused by stony, ccbb4y, or Ilw-2 (MLRA-16) and 1iw-2 (MLRA-17) consist of very
<br /> gravelly material in the substratum. deep soils. The soils in capability unit Ilw-2 (MCRA-1 6)
<br /> r 1. Indicates limitations caused by slope or by an are in the California Delta. They are poorly suited to
<br /> actual or potential erosion hazard. most deep-rooted crops because of the seasonal high
<br /> 2. Indicates a limitation of wetness caused by poor water table. Those in capability unit Ifw-2 (MLRA-17)
<br /> drainage or flooding. are in the Sacramento and San Joaquin Valley, They
<br /> I 3. Indicates a limitation of slow or very slow are occasionally flooded but are suited to deep-rooted
<br /> permeability in the subsoil or substratum. . crops in most areas.
<br /> f 4, Indicates a low available water capacity in sandy MLRA-15, the Central California Coast Range,—The
<br /> i or gravelly soils. mountains of the Coast Range, which are in the
<br /> i 5. Indicates limitations caused by a fine textured or southwestern part of the county, are in this major land
<br /> i x
<br /> very fine textured surface layer. resource area. Most of the soils are shallow or
<br /> 6. Indicates limitations caused by salts or sodium. moderately deep to bedrock and are steep or very
<br /> ' 7. Indicates limitations caused by rocks, stones, or steep.
<br /> cobblestones: The natural vegetation is mainly annual grasses and
<br /> 8. Indicates that the soil has a very low or low (orbs in the northeastern part of the Coast Range and
<br /> available water capacity because the root zone mixed annual grasses, fortis, shrubs, and blue oak in
<br /> generally is less than 40 Inches deep over a hardpan or the southwestern pari. Elevation ranges from 300 to
<br /> massive bedrock. 3,300 feet. The average annual precipitation is 10 to 18
<br /> 9, Indicates that a problem or limitation is caused inches. The average annual ail temperature is 60 to 61
<br /> by love or very low fertility associated with strong acidity; degrees F, and the average frost-free period is 200 to
<br /> a lour calcium-magnesium ratio; or excess sodium, 270 days.
<br /> ' + baron, or molybdenum. The part of the county in this resource area generally
<br /> 10. Indicates that a problem or limitation, such as is used for livestock grazing. A few areas are used for
<br /> subsidence or susceptibility to burning or soil blowing, is more intensive purposes, .such as off-highway vehicle
<br /> caused by a high content of organic matter, recreation areas and industrial development.
<br /> The irrigated and nonirrigated capability classification Throughout most of the area, the supply of ground
<br /> of each map unit is shown in table 8 and in the section water is very limited and streamflow is intermittent.
<br /> E" "Detailed Soil Map Units." It a soil Is not irrigable, only Water for livestock is provided by stock ponds, which
<br /> i the nonirrigated capability classification is shown. are in scattered arsas. Water for domestic and
<br /> Miscellaneous areas are not assigned a capability industrial uses is limited in quantity and }poor in quality.
<br /> classification. This area provides valuable habitat for wildlife.
<br /> Ell
<br /> MLRA-f6, tho California Delta.—The Sacramento-San
<br /> Major Land Resource Areas Joaquin De€ta, which is at the confluence of the
<br /> The land capalu lity classification system is further Sacramento and San Joaquin Rivers in the western part
<br /> refined by designating the major land resource area of the county, is in this major land resource area. The
<br /> INA] PA1 of the anikc A I-qn l racmiri-Q nrnn in a hrnari riAlta is dividR.fl by rivers and sloughs into a larne
<br /> Fill e
<br /> �f
<br /> FROM 2099466036 . TO 12/31/01 1 :45 PM Page 3
<br /> Land Capability Classification
<br /> XD'
<br />
|