Natural Resources
Conservation Service

Shallow To Moderately Deep Petrocalcic Fan Remnants (Provisional)

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List model

Ecosystem states

State 1

Reference

State 2

Grazed, Non-native Species Present

4492

Circle-spoke model

Ecosystem states

State 1

State 2

4492

Scenario model

Ecosystem states

Current ecosystem state

Select a state

State 1
Reference
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State 2
Grazed, Non-native Species Present
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Management practices/drivers

Select a transition or restoration pathway

Transition T1
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No transition or restoration pathway between the selected states has been described

Target ecosystem state

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State 1
Reference
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State 2
Grazed, Non-native Species Present
More details

4492

State 1
Reference

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Description

This state represents the natural range of variability for this ecological site, pre-European settlement. This state no longer exists due to the naturalization of non-native species, and data for this state does not exist. This state had infrequent fire, only native species, and no livestock grazing. Fluctuations in annual productivity would have occurred with climatic variability.

Submodel

1.1. Reference Community

State 2
Grazed, Non-native Species Present

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Grazed, Non-native Species Present

Community Phase 2.1

Community Phase 2.2

Description

This is the representative state for this ecological site. It is similar in composition to the reference state, but non-native species are present, perennial grasses may be less abundant, and livestock grazing and high severity, large fires introduce new ecological dynamics.

Submodel

2.1. Representative Community

2.2. Fire/Clearing Recovery

2.3. Grazed (Provisional)

Transition T1

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Mechanism

This transition occurred with naturalization of non-native annual species such as red brome (Bromus rubens), cheatgrass (Bromus tectorum), and redstem storks bill (Erodium cicutarium), and the introduction of livestock grazing with European exploration and settlement from the 1860s through the 1900s (e.g. Brooks and Chambers 2011). The ubiquitous presence of non-native annuals means that removing them entirely and returning to the reference state is not possible.

Model keys

Briefcase

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Natural Resources
Conservation Service

Shallow To Moderately Deep Petrocalcic Fan Remnants (Provisional)

List model

Circle-spoke model

Scenario model

Current ecosystem state

Management practices/drivers

Target ecosystem state

State 1
Reference

Description

Submodel

State 2
Grazed, Non-native Species Present

Description

Submodel

Transition T1

Mechanism

Model keys

Briefcase

Ecological sites

Major Land Resource Areas

Search

Natural ResourcesConservation Service

Shallow To Moderately Deep Petrocalcic Fan Remnants (Provisional)

Model keys

Natural Resources
Conservation Service