Natural Resources
Conservation Service
Major Land Resource Area 039X
Major Land Resource Area
Accessed: 04/22/2026
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Next, learn more about the selected ecological site and its characteristic dynamics by browsing the ecological site description and exploring alternative state and transition model formats.
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ProvisionalF039XA001NM/F039XA001NMPseudotsuga menziesii-Populus tremuloides/Quercus gambelii-Robinia neomexicana -
ProvisionalF039XA002NM/F039XA002NMPinus ponderosa-Pseudotsuga menziesii/Quercus gambelii-Cercocarpus montanus
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ProvisionalF039XA003NM/F039XA003NMPinus edulis-Juniperus scopulorum/Quercus gambelii/Bouteloua gracilis
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ProvisionalF039XA004NM/F039XA004NMPinus ponderosa-Juniperus deppeana/Quercus gambelii/Festuca arizonica
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Ecological site map
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Zoom in to display soil survey map units for an area of interest, and zoom out to display MLRAs. Select a map unit polygon to view ecological sites correlated to that map unit. View a brief description of an ecological site by clicking on its name in the map popup. Soil survey correlations may not be accurate, and ecological site classification of a location should always be verified in the field. Each selection may require the transfer of several hundred KB of data.
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Ecological sites
Major Land Resource Areas
Ecological site photos
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interactive key
precipitation
frost free days
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Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
17” to 22” p.z.
22” to 30” p.z. Rangeland. Uplands (does not receive additional run-in moisture). Slopes generally less than or equal to 15%
Forestland
Rangeland
Slopes generally less than or equal to 15%
Slopes generally greater than 15%. Soils Shallow or Very Shallow. Soil surface very stony loam. Subsurface clay loam and/or clay, generally cobbly. Soil is non-effervescent and shallow to basalt bedrock
F039XA135AZ – Basalt Hills 17-22" p.z. (PIPO, QUGA)
F039XA135AZ – Basalt Hills 17-22" p.z. (PIPO, QUGA)
Soils Shallow or Very Shallow
Soils Moderately Deep or Deeper
Soil surface stony loam to very cobbly loam. Subsurface cobbly clay loam to very cobbly clay. Soil is shallow to basalt bedrock
F039XA133AZ – Basalt Upland 17-22" p.z. (PIPO)
F039XA133AZ – Basalt Upland 17-22" p.z. (PIPO)
Soil surface very flaggy loam. Subsurface very flaggy loam. Soil is shallow to limestone bedrock and is slightly effervescent throughout
F039XA134AZ – Limestone Upland 17-22" p.z. (PIPO)
F039XA134AZ – Limestone Upland 17-22" p.z. (PIPO)
Soil surface loam. Subsurface clay loam, clay and/or sandy clay loam. Soil non-effervescent throughout the profile
F039XA111AZ – Loamy Upland 17-22" p.z. (PIPO)
F039XA111AZ – Loamy Upland 17-22" p.z. (PIPO)
Soil surface loam, generally gravelly or very gravelly. Subsurface loam, clay loam, and/or clay, often gravelly. Soil surface littered with cinders
F039XA132AZ – Cinder Upland 17-22" p.z. (QUGA, PIPO)
F039XA132AZ – Cinder Upland 17-22" p.z. (QUGA, PIPO)
Occurs in a bottom position (receives run-in moisture from surrounding ecological sites) and/or is Subirrigated
Uplands (does not receive additional run-in moisture)
Flooded at least rarely
Soil Subirrigated
Soil surface clay, about 3 inches thick. Subsurface clay, silty clay and/or silt loam
R039XA129AZ – Clay Bottom 17-22"
R039XA129AZ – Clay Bottom 17-22"
Soil surface loam, about 3 inches thick. Subsurface clay loam, clay, and/or sandy clay, generally gravelly or very gravelly
R039XA130AZ – Loamy Bottom 17-22" p.z.
R039XA130AZ – Loamy Bottom 17-22" p.z.
Soil surface sandy loam to clay loam, 2 to 15 inches thick. Subsurface fine sandy loam to clay
R039XA108AZ – Meadow 17-22" p.z.
R039XA108AZ – Meadow 17-22" p.z.
Soil surface cobbly loam. Subsurface clay loam, generally very cobbly or extremely cobbly
R039XA137AZ – Loamy Upland 17-22" p.z. Subirrigated
R039XA137AZ – Loamy Upland 17-22" p.z. Subirrigated
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
R039XA131AZ – Loamy Bottom 17-22" p.z. Subirrigated
R039XA131AZ – Loamy Bottom 17-22" p.z. Subirrigated
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
R039XA109AZ – Wet Meadow 22-30" p.z.
R039XA109AZ – Wet Meadow 22-30" p.z.
Slopes generally equal to or less than 15 percent
Slopes generally greater than 15 percent. Soils moderately deep or deeper. Soil surface gravelly loam or gravelly silt loam, 8 to 16 inches thick. Subsurface is cinders
R039XA107AZ – Cinder Hills 17-22" p.z.
R039XA107AZ – Cinder Hills 17-22" p.z.
Soils very shallow or shallow. 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
R039XA105AZ – Shallow Loamy 17-22" p.z.
R039XA105AZ – Shallow Loamy 17-22" p.z.
Soils moderately deep and deep
Soil surface silt loam to gravelly clay loam, two to three inches thick. Subsurface stony clay to clay
R039XA103AZ – Clayey Upland 17-22" p.z.
R039XA103AZ – Clayey Upland 17-22" p.z.
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
R039XA138AZ – Clay Loam Upland 17-22 p.z.
R039XA138AZ – Clay Loam Upland 17-22 p.z.
Soil surface stony clay loam, cobbly silt loam, or cobbly clay loam, 2 to 5 inches thick
R039XA106AZ – Stony Upland 17-22" p.z.
R039XA106AZ – Stony Upland 17-22" p.z.
Soil surface gravelly loam, cobbly loam, or gravelly silt loam, 4 to 10 inches thick. Subsurface gravelly clay loam to cobbly clay loam
R039XA104AZ – Loamy Upland 17-22" p.z.
R039XA104AZ – Loamy Upland 17-22" p.z.
Soils Shallow or Very Shallow. 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
R039XA122AZ – Shallow Loamy 22-30" p.z.
R039XA122AZ – Shallow Loamy 22-30" p.z.
Soils moderately deep and deep. Soil surface sandy loam about 3 inches thick. Subsurface loam to clay loam
R039XA121AZ – Loamy Upland 22-30" p.z.
R039XA121AZ – Loamy Upland 22-30" p.z.
Long term average mean annual precipitation
- No filter
- 25 – 30cm (10 – 12in)
- 30 – 35cm (12 – 14in)
- 35 – 40cm (14 – 16in)
- 40 – 50cm (16 – 20in)
- 50 – 60cm (20 – 24in)
- 60 – 80cm (24 – 31in)
—
cm
Long term average frost free days
- No filter
- 50 – 70days
- 70 – 90days
- 90 – 110days
- 110 – 130days
- 130 – 150days
- 150 – 170days
- 170 – 190days
- 190 – 210days
- 210 – 230days
- 230 – 250days
- 250 – 270days
- 270 – 290days
—
days
- No filter
- 1200 – 1400m (3900 – 4600ft)
- 1400 – 1600m (4600 – 5200ft)
- 1600 – 1800m (5200 – 5900ft)
- 1800 – 2000m (5900 – 6600ft)
- 2000 – 2200m (6600 – 7200ft)
- 2200 – 2400m (7200 – 7900ft)
- 2400 – 2600m (7900 – 8500ft)
- 2600 – 2800m (8500 – 9800ft)
- 2800 – 3000m (9800 – 26240ft)
- 3000 – 8000m
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
- 50 – 60%
- 60 – 70%
- 70 – 80%
—
%
- No filter
- Alluvial fan
- Alluvial flat
- Channel
- Cinder cone
- Depression
- Dome
- Drainageway
- Escarpment
- Fan
- Fan piedmont
- Fan remnant
- Flood plain
- Flood-plain step
- Hill
- Knoll
- Lava flow
- Lava plain
- Mesa
- Mountain
- Mountain slope
- Mountain valley
- Plain
- Plateau
- Ridge
- Structural bench
- Swale
- No filter
- Basalt
- Limestone and sandstone
- Pyroclastic (consolidated)
- Tuff, welded
- Volcanic breccia, basic
- No filter
- Alluvium
- Cinders
- Colluvium
- Residuum
- Tephra
Soil surface texture
- No filter
- Clay
- Clay loam
- Coarse sand
- Fine sandy loam
- Loam
- Loamy sand
- Sandy clay loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 39
I.
17” to 22” p.z.
A.
Forestland
1
Slopes generally less than or equal to 15%
i.
Soils Shallow or Very Shallow
a.
Soil surface stony loam to very cobbly loam. Subsurface cobbly clay loam to very cobbly clay. Soil is shallow to basalt bedrock
... F039XA133AZ – Basalt Upland 17-22" p.z. (PIPO)
b.
Soil surface very flaggy loam. Subsurface very flaggy loam. Soil is shallow to limestone bedrock and is slightly effervescent throughout
... F039XA134AZ – Limestone Upland 17-22" p.z. (PIPO)
ii.
Soils Moderately Deep or Deeper
a.
Soil surface loam. Subsurface clay loam, clay and/or sandy clay loam. Soil non-effervescent throughout the profile
... F039XA111AZ – Loamy Upland 17-22" p.z. (PIPO)
b.
Soil surface loam, generally gravelly or very gravelly. Subsurface loam, clay loam, and/or clay, often gravelly. Soil surface littered with cinders
... F039XA132AZ – Cinder Upland 17-22" p.z. (QUGA, PIPO)
2
Slopes generally greater than 15%. Soils Shallow or Very Shallow. Soil surface very stony loam. Subsurface clay loam and/or clay, generally cobbly. Soil is non-effervescent and shallow to basalt bedrock
... F039XA135AZ – Basalt Hills 17-22" p.z. (PIPO, QUGA)
B.
Rangeland
1
Occurs in a bottom position (receives run-in moisture from surrounding ecological sites) and/or is Subirrigated
i.
Flooded at least rarely
a.
Soil surface clay, about 3 inches thick. Subsurface clay, silty clay and/or silt loam
... R039XA129AZ – Clay Bottom 17-22"
b.
Soil surface loam, about 3 inches thick. Subsurface clay loam, clay, and/or sandy clay, generally gravelly or very gravelly
... R039XA130AZ – Loamy Bottom 17-22" p.z.
c.
Soil surface sandy loam to clay loam, 2 to 15 inches thick. Subsurface fine sandy loam to clay
... R039XA108AZ – Meadow 17-22" p.z.
ii.
Soil Subirrigated
a.
Soil surface cobbly loam. Subsurface clay loam, generally very cobbly or extremely cobbly
... R039XA137AZ – Loamy Upland 17-22" p.z. Subirrigated
b.
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
... R039XA131AZ – Loamy Bottom 17-22" p.z. Subirrigated
c.
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
... R039XA109AZ – Wet Meadow 22-30" p.z.
2
Uplands (does not receive additional run-in moisture)
i.
Slopes generally equal to or less than 15 percent
a.
Soils very shallow or shallow. 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
... R039XA105AZ – Shallow Loamy 17-22" p.z.
b.
Soils moderately deep and deep
1)
Soil surface silt loam to gravelly clay loam, two to three inches thick. Subsurface stony clay to clay
... R039XA103AZ – Clayey Upland 17-22" p.z.
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
... R039XA138AZ – Clay Loam Upland 17-22 p.z.
3)
Soil surface stony clay loam, cobbly silt loam, or cobbly clay loam, 2 to 5 inches thick
... R039XA106AZ – Stony Upland 17-22" p.z.
4)
Soil surface gravelly loam, cobbly loam, or gravelly silt loam, 4 to 10 inches thick. Subsurface gravelly clay loam to cobbly clay loam
... R039XA104AZ – Loamy Upland 17-22" p.z.
ii.
Slopes generally greater than 15 percent. Soils moderately deep or deeper. Soil surface gravelly loam or gravelly silt loam, 8 to 16 inches thick. Subsurface is cinders
... R039XA107AZ – Cinder Hills 17-22" p.z.
II.
22” to 30” p.z. Rangeland. Uplands (does not receive additional run-in moisture). Slopes generally less than or equal to 15%
A.
Soils Shallow or Very Shallow. 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
... R039XA122AZ – Shallow Loamy 22-30" p.z.
B.
Soils moderately deep and deep. Soil surface sandy loam about 3 inches thick. Subsurface loam to clay loam
... R039XA121AZ – Loamy Upland 22-30" p.z.
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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