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Ecological site F026XY062NV

Shallow Sandy Loam Slope 10-14 P.Z

Home / Esd catalog / MLRA 026X / Ecological site F026XY062NV
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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: Pinyon and juniper canopy cover is greater than 40 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: Singleleaf pinyon and Utah juniper canopy cover is greater than 40 percent. Little understory vegetation remains due to competition with trees for site resources.
T2B - Trigger: Catastrophic crown fire facilitates the establishment of non-native, annual weeds. Slow variables: Increase in tree crown cover, loss of perennial understory and an increase in annual non-native species. Threshold: Cheatgrass or other non-native annuals dominate the understory. Loss of deep-rooted perennial bunchgrasses changes spatial and temporal nutrient cycling and nutrient redistribution and reduces soil organic matter. Increased canopy cover of trees allows severe stand-replacing fire. The increased seed bank of non-native, annual species responds positively to post-fire conditions facilitating the transition to an Annual State.
R3A - The restoration is possible by manual or mechanical thinning of trees coupled with seeding. Probability of success is highest from community phase 3.1.
T3A - Trigger: Canopy fire reduces the pinyon and juniper overstory and facilitates the annual non-native species in the understory to dominate the site. Slow variables: Over time, cover, production and seed bank of annual non-native species increases. Threshold: Loss of deep-rooted perennial bunchgrasses and shrubs changes temporal and spatial nutrient capture and cycling within the community. Increase in canopy cover of trees increases rainfall interception and reduces soil moisture for understory species. Increased canopy cover of trees increases the risk for severe stand-replacing crown fire. The increased seed bank of non-native, annual species responds positively to post-fire conditions facilitating the transition to an Annual State.
1.1a - This community phase pathway is a result of a high-severity crown fire which will eliminate or reduce the singleleaf pinyon and Utah juniper overstory and the shrub component. This allows for the perennial bunchgrasses to dominate the site.
1.1b - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which allows for the gradual infilling of singleleaf pinyon and 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 singleleaf pinyon and Utah Juniper component. Wyoming big sagebrush reestablishes. Excessive herbivory might also reduce perennial grass understory.
1.3b - This community phase pathway occurs when fire reduces or eliminates tree canopy, allowing perennial grasses to dominate the site.
1.3a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which allows for the gradual maturation of singleleaf pinyon and Utah juniper. Infilling by younger trees continues. Excessive herbivory might also reduce the perennial grass understory.
1.4a - 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 30 percent. Over time young trees mature to replace and maintain the old-growth woodland. The Wyoming big sagebrush and perennial bunchgrass community increases in density and vigor.
1.4b - This community phase pathway is a result of a high-severity crown fire which will eliminate or reduce the singleleaf pinyon and Utah juniper overstory and the shrub component allowing for the perennial bunchgrasses to dominate the site.
2.1a - This community phase pathway is a result of a high-severity crown fire which will eliminate or reduce the singleleaf pinyon and 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 allows for the gradual infilling of singleleaf pinyon and Utah juniper.
2.2a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which allows for the gradual maturation of the singleleaf pinyon and Utah Juniper component. Wyoming big sagebrush reestablishes. 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.
2.3a - This community phase pathway is a result of time without disturbances such as fire, drought, or disease which allows for the gradual maturation of singleleaf pinyon and Utah juniper. Infilling by younger trees continues.
2.4a - This community phase pathwat occrs when low intensity fire, insect infestation, or disease kills individual trees within the stand reducing canopy cover to less than 30 percent. Over time young trees mature to replace and maintain the old-growth woodland. The Wyoming big sagebrush and perennial bunchgrass community increases in density and vigor. Annual non-natives present in trace amounts.
2.4b - This community phase pathway is a result of a high-severity crown fire which eliminates or reduces the singleleaf pinyon and Utah juniper overstory and the shrub component allowing 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 whichallows for the gradual maturation of singleleaf pinyon and Utah juniper. Infilling by younger trees continues.

State 4 submodel, plant communities