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Ecological site F026XY063NV

Shallow Sandy Pediment 13-15 P.Z. JUOS/ARTRW8/ACHY-HECO26

Home / Esd catalog / MLRA 026X / Ecological site F026XY063NV
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T1A - Trigger: Introduction of non-native annual species. Slow variables: Over time the annual non-native plants will increase within the community. Threshold: Any amount of introduced non-native species causes an immediate decrease in the resilience of the site. Annual non-native species cannot be easily removed from the system and have the potential to significantly alter disturbance regimes from their historic range of variation.
T1B - Trigger: Time and a lack of disturbance allow trees to dominate site resources; might be coupled with inappropriate herbivory that favors shrub and tree dominance. Slow variables: Over time the abundance and size of trees will increase. Threshold: Juniper canopy cover is greater than 25 percent. Little understory vegetation remains due to competition with trees for site resources.
T2A - Trigger: Time and a lack of disturbance allow trees to dominate site resources; might be coupled with inappropriate grazing management that favors shrub and tree dominance. Slow variables: Over time the abundance and size of trees will increase. Threshold: Utah juniper canopy cover is greater than 25 percent. Little understory vegetation remains due to competition with trees for site resources.
R3A - This restoration is a result of manual or mechanical thinning of trees coupled with seeding. Probability of success is highest from community phase 3.1.
1.1a - This community phase pathway is a result of a high-severity crown fire which reduces or eliminates the Utah juniper overstory.
1.1b - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual infilling of juvenile Utah juniper.
1.2a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual maturation of the Utah Juniper component. Wyoming big sagebrush reestablishes. Excessive herbivory might also reduce perennial grass understory.
1.3a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual maturation of Utah juniper. Infilling by younger trees continues. Excessive herbivory might also reduce perennial bunchgrass understory.
1.3b - This community phase occurs when a fire reduces or eliminates tree canopy, allowing perennial grasses to dominate the site.
1.4a - This community phase pathway is a result of low intensity fire, insect infestation, or disease that kills individual trees within the stand, reducing canopy cover to less than 20 percent. Over time, young trees mature to replace and maintain the old-growth woodland. The big sagebrush and perennial bunchgrass community increases in density and vigor because of increased availability of light and water resources.
2.1a - This community phase pathway is a result of a high-severity crown fire which will eliminate or reduce the Utah juniper overstory and the shrub component. This allows for the perennial bunchgrasses to dominate the site.
2.1b - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual infilling of Utah juniper.
2.2a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual maturation of the Utah Juniper component. Big sagebrush reestablishes. Excessive herbivory might also reduce perennial grass understory.
2.3a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual maturation of Utah juniper. Infilling by younger trees continues. Excessive herbivory might also reduce perennial grass understory.
2.3b - This community phase pathway occurs when fire reduces or eliminates tree canopy, allowing perennial grasses to dominate the site.
2.4a - This community phase pathway is a result of low intensity fire, insect infestation, or disease which kills individual trees within the stand reducing canopy cover to less than 20 percent. Over time young trees mature to replace and maintain the old-growth woodland. The big sagebrush and perennial bunchgrass community increases in density and vigor. Annual non-natives present in trace amounts.
2.4b - This community phase pathway occurs when a high-severity crown fire eliminates or reduces the Utah juniper overstory and the shrub component which will allow for the perennial bunchgrasses to dominate the site. Annual non-native grasses typically respond positively to fire and might increase in the post-fire community.

State 3 submodel, plant communities

3.1a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which will allow for the gradual maturation of Utah juniper. Infilling by younger trees continues.