Thermic Ultramafic Foothills Extremely High Magnesium Content (Ca:Mg Ratio Less Than 0.5)

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State 1

Reference State

2471

Circle-spoke model

Ecosystem states

State 1

2471

Scenario model

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State 1
Reference State
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State 1
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2471

State 1
Reference State

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Community phase 1.1 during spring with buckbrush in flower; Photo: D. Evans, 2012.

Community Phase 1.2, with buckbrush seedlings in post-fire community; Photo: C. Savastio, 2011.

Community Phase 1.3, recently cleared brush (within 3-5 years); Photo: D. Evans, 2013.

Example of a mature shrub community phase in the Red Hills ACEC., Tuolumne County; Photo: C. Savastio, 2011.

Description

State 1 represents the historic range of variability for this ecological site. This ecological site may be one of the few examples in California where historic plant communities are still observable. Ultramafic soils often offer a refuge to many native endemic herbaceous species because its unique soil chemistry is not amenable to the vast majority of plant species. Most of the endemic plants are still intact, despite the introduction of a number of annual grasses and forbs arriving after the discovery of the New World.

Submodel

1.1. Reference community

1.2. Post-fire plant community

1.3. Cleared shrub community

1.4. Mature shrub community

Model keys

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Thermic Ultramafic Foothills Extremely High Magnesium Content (Ca:Mg Ratio Less Than 0.5)

List model

Circle-spoke model

Scenario model

Current ecosystem state

Management practices/drivers

Target ecosystem state

State 1
Reference State

Description

Submodel

Model keys

Briefcase

Ecological sites

Major Land Resource Areas