Natural Resources
Conservation Service
Major Land Resource Area 138X
Major Land Resource Area
Accessed: 04/29/2026
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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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Ecological sites
Major Land Resource Areas
Ecological site photos
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interactive key
precipitation
frost free days
more..
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Precipitation
Frost free days
Elevation
Slope
Landform
Parent material kind
Soil texture
Site occurs along major rivers and streams and experiences regular flooding, or would in the absence of water control structures
Site does not occur along major rivers and stream, or if it does occur near major rivers and streams it is not influenced by regular flooding events (even in the absence of water control structures)
Site occurs on a flood plain
Site occurs on a stream terrace
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
PX138X00Y010 – Sandy Flood Plain Marshes and Swamps
PX138X00Y010 – Sandy Flood Plain Marshes and Swamps
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y020 – Sandy Over Loamy Flood Plain Marshes and Swamps
PX138X00Y020 – Sandy Over Loamy Flood Plain Marshes and Swamps
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y030 – Loamy and Clayey Flood Plain Marshes and Swamps
PX138X00Y030 – Loamy and Clayey Flood Plain Marshes and Swamps
Deep dry sands
PX138X00Y040 – Sandhill or Scrub on Stream Terraces
PX138X00Y040 – Sandhill or Scrub on Stream Terraces
Argillic horizon below 40 inches, or is absent.
PX138X00Y050 – Sandy or Sandy Over Loamy Upland Pine on Stream Terraces
PX138X00Y050 – Sandy or Sandy Over Loamy Upland Pine on Stream Terraces
Argillic horizon within 20 inches, or is absent.
PX138X00Y060 – Loamy and Clayey Bottomland Forests on Stream Terraces
PX138X00Y060 – Loamy and Clayey Bottomland Forests on Stream Terraces
Site occurs in a closed depression (concave - concave slope shapes)
Site occurs on lowland flats
Site occurs on uplands
Site occurs on xeric uplands
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
PX138X00Y070 – Sandy Depression Basin and Dome Swamps
PX138X00Y070 – Sandy Depression Basin and Dome Swamps
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y080 – Sandy Over Loamy Depression Basin and Dome Swamps
PX138X00Y080 – Sandy Over Loamy Depression Basin and Dome Swamps
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y090 – Loamy and Clayey Depression Bottomland Forests
PX138X00Y090 – Loamy and Clayey Depression Bottomland Forests
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
PX138X00Y100 – Sandy Lowland Flats
PX138X00Y100 – Sandy Lowland Flats
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y110 – Sandy Over Loamy Lowland Flats
PX138X00Y110 – Sandy Over Loamy Lowland Flats
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
PX138X00Y120 – Loamy and Clayey Lowland Flats
PX138X00Y120 – Loamy and Clayey Lowland Flats
Slope nearly level to gently sloping (0 to 8%)
Slope strongly sloping to very steep (>8 to 60%)
PX138X00Y220 – Sandy Upland Mixed Forests on Steep Slopes
PX138X00Y220 – Sandy Upland Mixed Forests on Steep Slopes
Depth to seasonal high water table (SHWT) 18 to 42 inches
Depth to seasonal high water table (SHWT) 42 to 80 inches
Depth to seasonal high water table (SHWT) greater than 80 inches
Argillic or spodic horizon below 40 inches, or is absent. Some soils may have a mollic or umbric horizon.
PX138X00Y130 – Moist Sandy Upland Pine
PX138X00Y130 – Moist Sandy Upland Pine
Argillic horizon between 20 and 40 inches.
PX138X00Y140 – Moist Sandy Over Loamy Upland Pine
PX138X00Y140 – Moist Sandy Over Loamy Upland Pine
Argillic horizon within 20 inches.
PX138X00Y150 – Moist Loamy and Clayey Upland Pine
PX138X00Y150 – Moist Loamy and Clayey Upland Pine
Argillic horizon below 40 inches, or is absent.
PX138X00Y160 – Dry Sandy Upland Pine
PX138X00Y160 – Dry Sandy Upland Pine
Argillic horizon between 20 and 40 inches.
PX138X00Y170 – Dry Sandy Over Loamy Upland Pine
PX138X00Y170 – Dry Sandy Over Loamy Upland Pine
Argillic horizon within 20 inches.
PX138X00Y180 – Dry Loamy and Clayey Upland Pine
PX138X00Y180 – Dry Loamy and Clayey Upland Pine
Bedrock between 10 and 40 inches.
PX138X00Y190 – Shallow Sandy or Loamy Upland Pine
PX138X00Y190 – Shallow Sandy or Loamy Upland Pine
Argillic horizon between 20 and 40 inches.
PX138X00Y200 – Very Dry Sandy Over Loamy Upland Pine
PX138X00Y200 – Very Dry Sandy Over Loamy Upland Pine
Argillic horizon within 20 inches.
PX138X00Y210 – Very Dry Loamy and Clayey Upland Pine
PX138X00Y210 – Very Dry Loamy and Clayey Upland Pine
Slope nearly level to gently sloping (0 to 8%)
PX138X00Y230 – Sandhill or Scrub on Gentle Slopes of Uplands
PX138X00Y230 – Sandhill or Scrub on Gentle Slopes of Uplands
Slope strongly sloping to very steep (>8 to 60%)
PX138X00Y240 – Sandhill or Scrub on Steep Slopes of Uplands
PX138X00Y240 – Sandhill or Scrub on Steep Slopes of Uplands
Long term average mean annual precipitation
- No filter
- 120 – 140cm (47 – 55in)
—
cm
Long term average frost free days
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- 210 – 230days
—
days
- No filter
- 0 – 200m (0 – 700ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
—
%
- No filter
- Depression
- Dune
- Flat
- Flatwoods
- Flood plain
- Knoll
- Ridge
- Rise
- Stream terrace
- Valley side
- No filter
- Alluvium
- Eolian deposits
- Fluviomarine deposits
- Marine deposits
Soil surface texture
- No filter
- Clay
- Fine sand
- Fine sandy loam
- Loamy fine sand
- Loamy sand
- Sand
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Ecological site keys
MLRA 138
Landscape
Site occurs along major rivers and streams and experiences regular flooding, or would in the absence of water control structures
Landform
Site occurs on a flood plain
Soil
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
... PX138X00Y010 – Sandy Flood Plain Marshes and Swamps
Soil
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y020 – Sandy Over Loamy Flood Plain Marshes and Swamps
Soil
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y030 – Loamy and Clayey Flood Plain Marshes and Swamps
Landform
Site occurs on a stream terrace
Soil
Argillic horizon below 40 inches, or is absent.
... PX138X00Y050 – Sandy or Sandy Over Loamy Upland Pine on Stream Terraces
Soil
Argillic horizon within 20 inches, or is absent.
... PX138X00Y060 – Loamy and Clayey Bottomland Forests on Stream Terraces
Landscape
Site does not occur along major rivers and stream, or if it does occur near major rivers and streams it is not influenced by regular flooding events (even in the absence of water control structures)
Landform
Site occurs in a closed depression (concave - concave slope shapes)
Soil
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
... PX138X00Y070 – Sandy Depression Basin and Dome Swamps
Soil
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y080 – Sandy Over Loamy Depression Basin and Dome Swamps
Soil
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y090 – Loamy and Clayey Depression Bottomland Forests
Landform
Site occurs on lowland flats
Soil
Spodic horizon within 30 inches, an argillic horizon below 40, or both. Some soils may have a mollic or umbric horizon. Some soils may lack a diagnostic horizon.
... PX138X00Y100 – Sandy Lowland Flats
Soil
Argillic horizon between 20 and 40 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y110 – Sandy Over Loamy Lowland Flats
Soil
Argillic horizon within 20 inches. Some soils may have a mollic or umbric horizon.
... PX138X00Y120 – Loamy and Clayey Lowland Flats
Landform
Site occurs on uplands
Slope
Slope nearly level to gently sloping (0 to 8%)
SHWT
Depth to seasonal high water table (SHWT) 18 to 42 inches
Soil
Argillic or spodic horizon below 40 inches, or is absent. Some soils may have a mollic or umbric horizon.
... PX138X00Y130 – Moist Sandy Upland Pine
Soil
Argillic horizon between 20 and 40 inches.
... PX138X00Y140 – Moist Sandy Over Loamy Upland Pine
SHWT
Depth to seasonal high water table (SHWT) 42 to 80 inches
SHWT
Depth to seasonal high water table (SHWT) greater than 80 inches
Soil
Argillic horizon between 20 and 40 inches.
... PX138X00Y200 – Very Dry Sandy Over Loamy Upland Pine
Slope
Slope strongly sloping to very steep (>8 to 60%)
... PX138X00Y220 – Sandy Upland Mixed Forests on Steep Slopes
Landform
Site occurs on xeric uplands
Slope
Slope nearly level to gently sloping (0 to 8%)
... PX138X00Y230 – Sandhill or Scrub on Gentle Slopes of Uplands
Slope
Slope strongly sloping to very steep (>8 to 60%)
... PX138X00Y240 – Sandhill or Scrub on Steep Slopes of Uplands
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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