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Draft. A draft ecological site description is either incomplete or has not undergone quality control and quality assurance review.
Table 1. Dominant plant species
Tree Not specified
Shrub Not specified
Herbaceous (1) Bromus hordeaceus
(2) AvenaPhysiographic features
This site occurs on alluvial fans. Elevation ranges from 350 to 1800 feet. Slopes range from 0 to 2 percent.
Table 2. Representative physiographic features
Landforms (1) Alluvial fan
Flooding duration Brief (2 to 7 days) Flooding frequency Rare Elevation 300 – 1800 ft Slope 0 – 2 % Aspect Aspect is not a significant factor Climatic features
Precipitation ranges from 32 to 55 inches per year. The average annual air temperature is 54 F to 59 F. The frost-free period is 150 to 250 days.
Table 3 Representative climatic features
Frost-free period (average) 250 days Freeze-free period (average) 0 days Precipitation total (average) 60 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, somewhat excessively drained soils containing 35 to 60 percent rock fragments throughout the profile. Typically, the surface layer is dark and high in organic matter. Textures are gravelly or very gravelly sandy loam 9 to 19 inches thick. The underlying material to a depth of 60 inches is stratified very gravelly sandy loam, very gravelly coarse sandy loam and very gravelly coarse loamy sand. Available water capacity is very low to low. It is subject to flooding during prolonged, high-intensity storms with channeling and deposition common along streambanks. Permeability is moderately rapid. Effective rooting depth is 60 inches or more.
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 203 Talmage gravelly sandy loam, 0-2%
CA687 204 Talmage gravelly sandy loam, 0-2%Table 4. Representative soil features
Surface texture (1) Gravelly sandy loam
(2) Extremely gravelly sandy loam
Family particle size (1) Loamy
Drainage class Somewhat excessively drained Permeability class Moderately rapid Soil depth 80 – 0 in Available water capacity
(0-40in)2.5 in Soil reaction (1:1 water)
(0-40in)5.6 – 7.8 Subsurface fragment volume <=3"
(Depth not specified)28 – 41 % Subsurface fragment volume >3"
(Depth not specified)2 – 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.
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 680 1275 1870 Forb 120 225 330 Total 800 1500 2200 Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 80–90 Forb2 10–20 Interpretations
Animal community
Recommended stocking rate is 0.2 AUM/ac for an average year (for comparison purposes only). An on-site visit is needed to determine initial stocking rates.
Hydrological functions
The site is subject to flooding during prolonged, high-intensity storms with channeling and deposition common along streambanks.
Supporting information
Inventory data references
This site was developed for MLRA 14, Eastern Mendocino Soil Survey. Information was taken from digital copy of ESD in Lori Metz's MLRA folders. Data was approved by RLW in 09/1990.
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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