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P1170437

Ecological site EX043B18I036

Droughty 19-24 inches precipitation zone Cryic Beaverhead Mountains

Home / Esd catalog / MLRA 043B / Ecological site EX043B18I036
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T1B - The trigger for this transition is improper grazing management and long-term drought leading to a decrease in bluebunch wheatgrass composition to 15 percent and reduction in total plant canopy cover.
T1C - The driver for this transition is improper grazing management, intense or repeated fires, or heavy human disturbance.
T1D - Recent dry climate cycles, repeated heavy grazing or intense human activities can open the interspaces of the bunchgrass community and allow for encroachment.
T1E - Conifer tree/shrub count exceeds two stems per acre. The trigger of crossing a threshold is the presence of seeds and/or other viable material of these tree species.
R2A - Recovery to the Reference State (1) will require reclamation efforts such as soil rebuilding, intensive mechanical and cultural treatments, and revegetation.
T2A - As improper grazing continues vigor of bunchgrasses will decrease, and the shorter grasses and shrubs will increase towards the Degraded State (3).
T2B - The trigger is the presence of seeds and other viable material of invasive species.
T2D - Conifer tree/shrub count exceeds two stems per acre. The trigger of crossing a threshold is the presence of seeds and other viable material of these tree species.
R3B - The drivers for the restoration pathway are removal of increaser species, restoration of native bunchgrass species, persistent management of invasives and shrubs, and proper grazing management.
R3A - If a sufficient amount of bunchgrass remains on the site, chemical application or biological control in conjunction with proper grazing management, can reduce the amount of shrubs and invasive species and restore the site to the Shortgrass Community (2.2).
T3A - The trigger is the presence of seeds or viable material of invasive species.
T3C - Conifer tree/shrub count exceeds two stems per acre. The trigger of crossing a threshold is the presence of seeds and other viable material of these tree species.
R4C - The drivers for the restoration pathway are removal of invasive species, restoration of native bunchgrass species, persistent management of invasive species, and proper grazing management.
R4B - The driver for the reclamation pathway is weed management with possible reseeding.
R4A - The driver for the reclamation pathway is weed management without reseeding.
T4B - Canopy cover of conifer tree/shrub cover exceeds two stems per acre. The threshold change is triggered by the presence of seeds and other viable material of invasive species.
R5A - Recovery requires a more intense mechanical removal of trees/shrubs. Reseeding and increased post treatment grazing management may be necessary.
R5B - Recovery requires a more intense mechanical removal of trees/shrubs. Reseeding and increased post treatment grazing management may be necessary.
R5C - Recovery requires a more intense mechanical removal of trees/shrubs. Reseeding and increased post treatment grazing management may be necessary.
R5D - Recovery requires a more intense mechanical removal of trees/shrubs. Reseeding and increased post treatment grazing management may be necessary.
2.1A - The driver for community shift 2.1A is continued overgrazing.

State 3 submodel, plant communities

State 4 submodel, plant communities

5.1A - The driver for this pathway is primarily lack of fire; however, heavy grazing (utilization that exceeds 50 percent) can help reduce herbaceous competition and expose soil for seed contact.
5.2B - The driver for this pathway is primarily lack of fire; however, heavy grazing (can help reduce herbaceous competition and expose soil for seed contact.