Soil Based Key to Major Land Resource Area (mlra) 39, Arizona and New Mexico Mountains, Ecological Sites Found in Arizona Prepared by: usda – nrcs arizona State Office Major Land Resource Area 39, Arizona and New Mexico Mountains




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Soil Based Key

to

Major Land Resource Area (MLRA) 39, Arizona and New Mexico Mountains, Ecological Sites

Found in Arizona
Prepared by:

USDA – NRCS

Arizona State Office
Major Land Resource Area 39, Arizona and New Mexico Mountains

Major Land Resource Area (MLRA) 39, Mogollon Coniferous Forests, is found in east-central Arizona and west-central New Mexico. It occurs in the Grand Canyon Section of the Colorado Plateau in Arizona and in the Datil Section of the Colorado Plateau in New Mexico.


The climate of the area is cool (mesic to frigid) and wet (typic ustic to udic ustic). Elevations range from below 7000 feet to 12,500 feet.
In Arizona there is one Common Resource Area (CRA), divided into two precipitation zones (17” – 22” p.z. and 22” to 30” p.z.), in the MLRA:

39.AZ1 – Lower Mogollon Transition Page 99



Common Resource Area 39.AZ1 – Mogollon Plateau Coniferous Forests


CRA 39.AZ1 Mogollon Plateau Coniferous Forests




Elevations range from 7000 to 12,500 feet and precipitation averages 20 to 35 inches per year. Vegetation includes ponderosa pine, Gambel oak, Arizona walnut, sycamore, Douglas fir, blue spruce, Arizona fescue, sheep fescue, mountain muhly, muttongrass, junegrass, pine dropseed, and dryland sedges. The soil temperature regime ranges from mesic to frigid and the soil moisture regime ranges from typic ustic to udic ustic. This unit occurs within the Colorado Plateau Physiographic Province and is characterized by a sequence of flat to gently dipping sedimentary rocks eroded into plateaus, valleys and deep canyons. Sedimentary rock classes dominate the plateau with volcanic fields occurring for the most part near its margin.







Common Resource Area 39.AZ1, Mogollon Plateau Coniferous Forest, Ecological Site List

Site ID Number

Site Name

F039XA102AZ

Pinus ponderosa/Quercus gambelii/Festuca arizonica-Blepharoneuron tricholepis

R039XA103AZ

Clayey Upland17-22" p.z.

R039XA104AZ

Loamy Upland17-22" p.z.

R039XA105AZ

Shallow Loamy17-22" p.z.

R039XA106AZ

Stony Upland17-22" p.z.

R039XA107AZ

Cinder Hills17-22" p.z.

R039XA108AZ

Meadow17-22" p.z.

R039XA109AZ

Wet Meadow22-30" p.z.

F039XA110AZ

Pinus ponderosa-Juniperus deppeana/Robinia neomexicana

F039XA111AZ

Pinus ponderosa-Quercus gambelii/Blepharoneuron tricholepis-Muhlenbergia montana

R039XA121AZ

Loamy Upland22-30" p.z.

R039XA122AZ

Shallow Loamy22-30" p.z.

F039XA124AZ

Pinus ponderosa-Populus tremuloides/Symphoricarpos oreophilus/Carex geophila-Geranium

R039XA129AZ

Clay Bottom17-22"

R039XA130AZ

Loamy Bottom17-22" p.z.

R039XA131AZ

Loamy Bottom17-22" p.z.Subirrigated

F039XA132AZ

Quercus gambelii-Pinus ponderosa/Robinia neomexicana/Muhlenbergia montana-Festuca arizonica

F039XA133AZ

Pinus ponderosa/Quercus gambelii/Festuca arizonica-Muhlenbergia montana

F039XA134AZ

Pinus ponderosa/Festuca arizonica-Muhlenbergia montana

F039XA135AZ

Pinus ponderosa-Quercus gambelii/Robinia neomexicana/Muhlenbergia montana-Blepharoneuron tricholepis

F039XA136AZ

Pinus ponderosa-Quercus gambelii/Ceanothus fendleri/Muhlenbergia montana

R039XA137AZ

Loamy Upland17-22" p.z.Subirrigated

R039XA138AZ

Clay Loam Upland17-22" p.z.

Key to Ecological Site found in Common Resource Area 39.AZ1, Mogollon Coniferous Forests

(17” to 22” p.z.)



Forestland

  1. Slopes generally less than or equal to 15%

    1. Soils Shallow or Very Shallow

      1. Soil surface stony loam to very cobbly loam. Subsurface cobbly clay loam to very cobbly clay. Soil is shallow to basalt bedrock – Basalt Upland - Pinus ponderosa / Quercus gambelii / Festuca arizonica - Muhlenbergia Montana (F039XA133AZ)

      2. Soil surface very flaggy loam. Subsurface very flaggy loam. Soil is shallow to limestone bedrock and is slightly effervescent throughout – Limestone Upland - Pinus ponderosa / / Festuca arizonica - Muhlenbergia Montana (F039XA134AZ)

    2. Soils Moderately Deep or Deeper

      1. Soil surface loam. Subsurface clay loam, clay and/or sandy clay loam. Soil non-effervescent throughout the profile – Loamy Upland - Pinus ponderosa - Quercus gambelii / / Blepharoneuron tricholepis - Muhlenbergia Montana (F039XA111AZ)

      2. Soil surface loam, generally gravelly or very gravelly. Subsurface loam, clay loam, and/or clay, often gravelly. Soil surface littered with cinders – Cinder Upland - Quercus gambelii - Pinus ponderosa / Robinia neomexicana / Muhlenbergia montana - Festuca arizonica (F039XA132AZ)

  2. Slopes generally greater than 15%

    1. Soils Shallow or Very Shallow

      1. Soil surface very stony loam. Subsurface clay loam and/or clay, generally cobbly. Soil is non-effervescent and shallow to basalt bedrock – Basalt Hills - Pinus ponderosa - Quercus gambelii / Robinia neomexicana / Muhlenbergia montana - Blepharoneuron tricholepis (F039XA135AZ)

    2. Soils Moderately Deep or Deeper

Rangeland

  1. Occurs in a bottom position (receives run-in moisture from surrounding ecological sites) and/or is Subirrigated

    1. Flooded at least rarely

      1. Soil surface clay, about 3 inches thick. Subsurface clay, silty clay and/or silt loam – Clay Bottom (R039XA129AZ)

      2. Soil surface loam, about 3 inches thick. Subsurface clay loam, clay, and/or sandy clay, generally gravelly or very gravelly – Loamy Bottom (R039XA130AZ)

      3. Soil surface sandy loam to clay loam, 2 to 15 inches thick. Subsurface fine sandy loam to clay – Meadow (R039XA108AZ)

    2. Soil Subirrigated

      1. Soil surface cobbly loam. Subsurface clay loam, generally very cobbly or extremely cobbly – Loamy Upland, Subirrigated (R039XA137AZ)

      2. Soil surface loam. Subsurface loam and/or clay loam, generally very stony or extremely stony. A water table is found at 0 to 5 inches from the soil surface – Loamy Bottom, Subirrigated (R039XA131AZ)

      3. Soil surface sandy loam to clay, 2 to 15 inches thick. Subsurface fine sandy loam to clay. Water table is at or near the soil surface – Wet Meadow (R039XA109AZ)

  2. Uplands (does not receive additional run-in moisture)

    1. Slopes generally equal to or less than 15 percent

      1. Soils very shallow or shallow

        1. Soil surface fine sandy loam, cobbly sandy loam, cobbly loam, sandy loam, or loam, about five inches thick. Subsurface loam, sandy clay loam, and/or clay loam with greater than 50 percent rock fragments. Soil is shallow to hard tuff – Shallow Loamy (R039XA105AZ)

      2. Soils moderately deep and deep

        1. Soil surface silt loam to gravelly clay loam, two to three inches thick. Subsurface stony clay to clay – Clayey Upland (R039XA103AZ)

        2. Soil surface is loam, generally gravelly, cobbly, or very stony. Subsurface is clay loam, clay and/or loam, generally gravelly, very gravelly, and/or cobbly – Clay Loam Upland (R039XA138AZ)

        3. Soil surface stony clay loam, cobbly silt loam, or cobbly clay loam, 2 to 5 inches thick – Stony Upland (R039XA106AZ)

        4. Soil surface gravelly loam, cobbly loam, or gravelly silt loam, 4 to 10 inches thick. Subsurface gravelly clay loam to cobbly clay loam – Loamy Upland (R039XA104AZ)

    2. Slopes generally greater than 15 percent

      1. Soils moderately deep or deeper

        1. Soil surface gravelly loam or gravelly silt loam, 8 to 16 inches thick. Subsurface is cinders – Cinder Hills (R039XA107AZ)

(22” to 30” p.z.)

Rangeland



  1. Uplands (does not receive additional run-in moisture)

    1. Slopes generally less than or equal to 15%

      1. Soils Shallow or Very Shallow

        1. Soil surface fine sandy loam, cobbly sandy loam, cobbly loam, sandy loam, or loam, about five inches thick. Subsurface loam, sandy clay loam, and/or clay loam with greater than 50 percent rock fragments. Soil is shallow to hard tuff – Shallow Loamy (R039XA122AZ)

      2. Soils moderately deep and deep

        1. Soil surface sandy loam about 3 inches thick. Subsurface loam to clay loam – Loamy Upland (R039XA121AZ)


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