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Ecological site F026XY061NV

Very Shallow Steep Sandy Slopes 12-14 P.Z.

Home / Esd catalog / MLRA 026X / Ecological site F026XY061NV
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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 grazing management that favors shrub and tree dominance. Slow variables: Over time the abundance and size of trees will increase. Threshold: Singleleaf pinyon canopy cover is greater than 50 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: Pinyon canopy cover is greater than 30 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: (a) An increase in tree crown cover, (b) a loss of perennial understory and (c) an increase in annual non-native species. Threshold: Cheatgrass or other non-native annuals dominate understory. Loss of deep-rooted perennial bunchgrasses changes: (a) spatial and temporal nutrient cycling, (b) nutrient redistribution, and (3) 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 - Manual or mechanical thinning of trees coupled with seeding. Probability of success is highest from community phase 3.1.
T3A - Trigger: Catastrophic fire reduces the tree overstory and allows for the annual non-native species in the understory to dominate the site. Soil disturbing treatments such as slash and burn might reduce tree canopy and allow for non-native annual species to increase. Slow variables: Over time, cover and production 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. Increased, continuous fine fuels modify the fire regime by increasing frequency, size, and spatial variability of fires.
1.1a - A high-severity crown fire will eliminate or reduce the singleleaf pinyon 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 disturbance such as fire, long-term drought, or disease which will allow for the gradual infilling of singleleaf pinyon.
1.2a - This Community Phase Pathway is a result of time without disturbance such as fire, long-term drought, or disease which will allow for the gradual maturation of the singleleaf pinyon component. Mountain big sagebrush reestablishes. Excessive herbivory might also reduce perennial grass understory.
1.3b - This Community Phase Pathway is a result of time without disturbance such as fire, long-term drought, or disease which will allow for the gradual maturation of singleleaf pinyon. Excessive herbivory might also reduce perennial grass understory.
1.3a - This Community Phase Pathway is a result of fire which 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 which kill individual trees within the stand, reducing canopy cover to less than 35 percent. Over time young trees mature to replace and maintain the old-growth woodland. The mountain big sagebrush and perennial bunchgrass communities increase in density and vigor.
1.4b - This Community Phase Pathway is a result of high-severity crown fire which will eliminate or reduce the singleleaf pinyon overstory and the shrub component which will allow for the perennial bunchgrasses to dominate the site.
2.1a - This Community Phase Pathway is when a high-severity crown fire eliminates or reduces the singleleaf pinyon 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 disturbance such as fire, long-term drought, or disease which will allow for the gradual infilling of singleleaf pinyon.
2.2a - This Community Phase Pathway is a result of time without disturbance such as fire, long-term drought, or disease which allows for the gradual maturation of the singleleaf pinyon component. Mountain big sagebrush reestablishes. Excessive herbivory might also reduce perennial grass understory.
2.3b - This Community Phase Pathway is a result of time without disturbance such as fire, long-term drought, or disease which allows for the gradual maturation of singleleaf pinyon. Excessive herbivory might also reduce the perennial grass understory.
2.3a - This Community Phase Pathway is a result of fire which reduces or eliminates tree canopy where perennial grasses dominate the site.
2.4a - This Community Phase Pathway is a result of low intensity fire, insect infestation, or a result of disease which kill individual trees within the stand, reducing canopy cover to less than 35 percent. Over time, young trees mature to replace and maintain the old-growth woodland. The mountain big sagebrush and perennial bunchgrass community increases in density and vigor. Annual non-natives are present in trace amounts.
2.4b - This Community Phase Pathway is a result of high-severity crown fire which eliminates or reduces the singleleaf pinyon overstory and also reduces the shrub component which allows for the perennial bunchgrasses to dominate the site. Annual non-native grasses typically respond positively to fire and may increase in the post-fire community.
3.1a - This Community Phase Pathway is a result of time without disturbance such as: (a) fire, (b) long-term drought, or (3) disease which allows for the gradual maturation of singleleaf pinyon. Infilling by younger trees continues.

State 4 submodel, plant communities