Rangeland health reference sheet

Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.

Indicators

1. Number and extent of rills:

   Rills are none. Rock fragments armor the soil surface against erosion.

2. Presence of water flow patterns:

   Water flow patterns are none to rare. A few may occur on steeper slopes (short <1 m) after summer convection storms.

3. Number and height of erosional pedestals or terracettes:

   Pedestals are none.

4. Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):

   Bare ground is 5-15%; surface rock fragments up to 70%.

5. Number of gullies and erosion associated with gullies:

   None Natural drainages may occur on steeper slopes and are well vegetated.

6. Extent of wind scoured, blowouts and/or depositional areas:

   None

7. Amount of litter movement (describe size and distance expected to travel):

   Fine litter (foliage from grasses and annual & perennial forbs) expected to move distance of slope length (<10 ft) during intense summer convection storms or rapid snowmelt events. Persistent litter (large woody material) will remain in place except during large rainfall events.

8. Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):

   Soil stability values should be 3 to 6 on most soil textures found on this site.

9. Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):

   Surface structure is typically weak, medium platy. Soil surface colors are pale browns and soils are typified by an ochric epipedon. Organic matter of the surface 2 to 3 inches is typically less than 1%. Organic matter content can be more or less depending on micro-topography.

10. Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:

    Perennial herbaceous plants slow runoff and increase infiltration. Shrub canopy and associated litter provide some protection from raindrop impact.

11. Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):

    Compacted layers are none. Platy or massive sub-surface horizons are not to be interpreted as compacted layers.

12. Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):

    Dominant:

    salt desert shrubs (shadscale)

    Sub-dominant:

    associated shrubs >> cool-season perennial bunchgrasses >> associated shrubs > perennial forbs > annual forbs > annual grasses.

    Other:

    succulents

    Additional:

13. Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):

    Dead branches within individual shrubs common and standing dead shrub canopy material may be as much as 25% of total woody canopy; some of the mature bunchgrasses (<20%) have dead centers.

14. Average percent litter cover (%) and depth ( in):

    Between interspaces 5-10% cover and depth of litter is <1/4 inch.

15. Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):

    For normal or average growing season ± 100 lbs/ac. Favorable years 150 lbs/ac and unfavorable years 25 lbs/ac.

16. Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:

    Potential invaders on this site include red brome, redstem filaree, Mediterranean grass, and annual mustards.

17. Perennial plant reproductive capability:

    All functional groups should reproduce in average (or normal) and above average growing season years. Little growth or reproduction occurs during drought years.

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