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Draft. A draft ecological site description is either incomplete or has not undergone quality control and quality assurance review.
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R014XD102CA Loamy
Table 1. Dominant plant species
Tree (1) Quercus
Shrub (1) Arctostaphylos
(2) Toxicodendron diversilobumHerbaceous (1) Bromus hordeaceus
(2) Avena barbataPhysiographic features
This site is located on old dissected terraces. Elevation ranges from 500 to 1500 feet. Slope ranges from 0 to 30 percent.
Table 2. Representative physiographic features
Landforms (1) Terrace
Elevation 500 – 1500 ft Slope 0 – 30 % Aspect Aspect is not a significant factor Climatic features
Precipitation ranges from 32 to 44 inches per year. The average annual air temperature is 57 F to 59 F. The frost-free period is 200 to 250 days.
Table 3 Representative climatic features
Frost-free period (average) 250 days Freeze-free period (average) 0 days Precipitation total (average) 40 in BarLineFigure 1. Monthly precipitation range
BarLineFigure 2. Monthly average minimum and maximum temperature
">Influencing water features
Soil features
This site is characterized by very deep, well drained soils that have a claypan which underlies the surface at about 8 inches. This hinders root growth, but does not stop it. They formed in old alluvium from sedimentary rocks and are on old dissected terraces. Fertility is low. Typically, the surface layer is sandy loam, loam, sandy clay loam or very gravelly sandy clay loam 8 inches thick. The upper subsoil is clay 10 inches thick. The lower subsoil is clay loam 30 inches thick. The substratum is loam to a depth of 60 inches or more. Available water capacity is high to very high. Permeability is moderately rapid to a depth of 8 inches and very slow below this depth.
This ecological site is associated with the map units and soil components in the following soil surveys. Future updates to the soil survey(s) may affect these associations.
CA687 222 Yokayo sandy loam, 8-15% slopes
CA687 223 Yokayo sandy loam, 15-30% slopes
CA687 221 Yokayo sandy loam, 0-8% slopes
CA687 224 Yokayo-Pinole-Pinnobie, 0-15% slopesTable 4. Representative soil features
Surface texture (1) Gravelly sandy loam
Family particle size (1) Clayey
Drainage class Well drained Permeability class Very slow Soil depth 80 – 0 in Available water capacity
(0-40in)3.6 in Soil reaction (1:1 water)
(0-40in)5.6 – 7.3 Subsurface fragment volume <=3"
(Depth not specified)8 – 11 % Subsurface fragment volume >3"
(Depth not specified)3 % Ecological dynamics
This list of plants and their relative proportions are based on near normal years. Fluctuations in species composition and relative production may change from year to year dependent upon abnormal precipitation or other climatic factors.
State and transition model
More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 1
Plant Community 1.1Community 1.1
Plant Community 1.1This list of plants and their relative proportions are based on near normal years. Fluctuations in species composition and relative production may change from year to year dependent upon abnormal precipitation or other climatic factors.
The historic climax plant community will produce approximately the following amounts of air-dry vegetation per acre:
Favorable year: 2400 pounds/acre
Normal year: 1800 pounds/acre
Unfavorable year: 900 pounds/acre
Ecological dynamics and major plant community types
The potential for perennial grass dominance on this site has not been determined.
Fire has probably helped maintain herbaceous dominance.
Figure 3. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
Plant type Low
(lb/acre)Representative value
(lb/acre)High
(lb/acre)Grass/Grasslike 765 1530 2040 Forb 135 270 360 Total 900 1800 2400 Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Tree1 0–10 Grass/Grasslike2 80–90 Forb3 10–20 Interpretations
Animal community
Recommended stocking rate is 0.4 AUM/ac for an average year (for comparison purposes only). An on-site visit is needed to determine initial stocking rates.
Supporting information
Inventory data references
This data is from the ESD developed for MLRA 14, Eastern Mendocino Soil Survey, by RLW in 09/1990. Was developed by the Ukiah FO.
Contributors
RLW
Rangeland health reference sheet
Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.
Author(s)/participant(s) Contact for lead author Date Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
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Presence of water flow patterns:
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Number and height of erosional pedestals or terracettes:
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Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
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Number of gullies and erosion associated with gullies:
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Extent of wind scoured, blowouts and/or depositional areas:
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Amount of litter movement (describe size and distance expected to travel):
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Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
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Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
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Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
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Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
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Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Sub-dominant:
Other:
Additional:
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Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
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Average percent litter cover (%) and depth ( in):
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Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
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Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
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Perennial plant reproductive capability:
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