Ecological site group DX035X01FESG11
Canyonlands - Shallow Shrublands and Woodlands - medium elevation
Last updated: 10/12/2022
Accessed: 05/02/2024
Ecological site group description
Key Characteristics
- Canyonlands
- Shallow Shrublands and Woodlands
- Mid-elevation MAST < 54 degrees F.
Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
Physiography
The ecological sites of this group occur in colluvium, slope alluvium and eolian deposits on hillslopes, mountain slopes, mesas, structural benches cuestas, pediments, and ridges. Runoff is high to very high due to shallow soil depth and is often influenced by micro-topography. Typically slopes range from 2 to 40 percent but range up to 70 percent. Elevations range from 4900 to 8000 feet.
Climate
The climate is characterized by hot summers and cool winters. Large fluctuations in daily temperatures are common. Approximately 70-75% of precipitation occurs as rain or snow from March through October. On the average, February, May, and June are the driest months and July through October are the wettest months. Precipitation is extremely variable from month to month and from year to year but averages between 8 and 16 inches per year. Much of the summer precipitation occurs as convection thunderstorms. Snow packs when present are generally light and not persistent.
Soil features
The soils on these sites are shallow and well drained to somewhat excessively well drained and formed in a variety of parent material dominantly colluvium, slope alluvium, and eolian deposits. Bedrock is typically sandstone or interbedded sandstone and shale but includes other sedimentary and igneous rocks. The soils are usually young and relatively undeveloped. Rock fragment content varies from relatively free of fragments in eolian soils to very gravelly and cobbly in soils derived from slope alluvium and colluvium. Surface fragments similarly range from few fragments to as much as 75 percent cover. Biological crust cover is characterized as a weak crust, with light cyanobacteria and/or isolated moss clumps with no continuity. The soils are generally nonsaline to slightly saline and nonsodic. Water holding capacity is low (0.5 to 3 inches). The soil moisture regime is ustic aridic or aridic ustic and the soil temperature regime is mesic.
Vegetation dynamics
The dominant visual aspect of the sites in this group is Utah juniper and two-needle pinyon. Shrubs, native perennial grasses and forb production is variable.
Drought and insects appear to be the main driving factors in many of the Pinyon/Juniper communities of Utah. Betancourt et al. (1993), noted that Pinyon and Juniper woodlands in the southwest appear to be more susceptible to large die offs during droughts, than in other locations. As severe droughts persist, the pinyon trees, being more susceptible to drought and insects, seem to die out, while the Utah juniper trees survive.
. There is little evidence to indicate that these sites historically maintained a short burn frequency. However, due to modern disturbances such as brush treatments, invasive species, and OHV use, the resilience of the plant communities may be at risk. Disturbances that reduce the presence of perennial grasses result in an opportunity for invasive annuals to enter into the system and may produce a fuel load for fire to become an ecological driver.
Major Land Resource Area
MLRA 035X
Colorado Plateau
Subclasses
Correlated Map Unit Components
22480882, 22480987, 22592517, 22592675, 22592375, 22593441, 22593753, 22593752, 22594036, 22594359, 22593517, 22594368, 22598239, 22598108, 22598112, 22598398, 22597950, 22598262, 22963750, 22963722, 22963707, 22963741, 22963710
Stage
Provisional
Contributors
Keith Crossland
Vic Parslow
Curtis Talbot
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