Limestone Fan Remnants (Provisional)

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List model

Ecosystem states

State 1

Reference (Provisional)

State 2

Representative

State 3

Burned, blackbrush lost

4497

Circle-spoke model

Ecosystem states

State 1

State 2

State 3

4497

Scenario model

Ecosystem states

Current ecosystem state

Select a state

State 1
Reference (Provisional)
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State 2
Representative
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State 3
Burned, blackbrush lost
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Management practices/drivers

Select a transition or restoration pathway

Transition T1
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Transition T2
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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 (Provisional)
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State 2
Representative
More details
State 3
Burned, blackbrush lost
More details

4497

State 1
Reference (Provisional)

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Description

This state represents the natural range of variability for this ecological site, pre-European settlement. Data for this state does not currently exist, due to the naturalization of non-native species and intense land use of the geographic reference area of this site beginning the early 1800's, which included fire, mining, land clearing, hog farming, and cattle grazing (Snorf 1991). This state had infrequent fire, only native species, and no livestock grazing. Fluctuations in annual productivity would have occurred with climatic variability.

State 2
Representative

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Description

This is the representative state for this ecological site. It is similar in composition to the reference plant community, but non-native species are present. Utah juniper cover may be lower than in the reference state due to widespread cutting of Utah juniper to support mining and settlements in the area (Snorf 1991). Overall cover may be lower due to ubiquitous livestock grazing, and perennial grass cover may be lower than in the reference state.

Submodel

2.1. Representative community Utah juniper - blackbrush

2.2. Fire Recovery (Provisional)

2.3. Grazed (Provisional)

State 3
Burned, blackbrush lost

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Description

This state exists when blackbrush is lost from the community. This occurs with large-scale fires where a blackbrush seed source is not available to recolonize, or with recurrent fire that does not provide a long enough interval to allow for blackbrush recovery. Much of the current extent of this ecological site is in this state.

Submodel

3.1. Utah juniper - black grama - big galleta

3.2. Fire Recovery (Provisional)

3.3. Grazed (Provisional)

Transition T1

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Mechanism

This transition occurred with naturalization of non-native annual species such as red brome, cheatgrass, and redstem storks bill, 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.

Transition T2

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Representative

Burned, blackbrush lost

Mechanism

This transition may occur with large-scale severe or recurrent fire.

Model keys

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Limestone Fan Remnants (Provisional)

List model

Circle-spoke model

Scenario model

Current ecosystem state

Management practices/drivers

Target ecosystem state

State 1
Reference (Provisional)

Description

State 2
Representative

Description

Submodel

State 3
Burned, blackbrush lost

Description

Submodel

Transition T1

Mechanism

Transition T2

Mechanism

Model keys

Briefcase

Ecological sites

Major Land Resource Areas