Natural Resources
Conservation Service
Major Land Resource Area 226X
Major Land Resource Area
Accessed: 04/17/2026
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1
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Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
2
Explore the ecological site description
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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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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Add ecological sites and Major Land Resource Areas to your briefcase by clicking on the briefcase (
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Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
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Type
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Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Soils associated with coastal, lowland, and upland water driven sites.
Soils not associated with water driven sites.
Coastal soils
VX226X00A103 – Aleutian Coastal Beach and Dune Complex
VX226X00A103 – Aleutian Coastal Beach and Dune Complex
Inland (freshwater) ecological sites
Riparian and lake shore soils, with flooding the dominant driver of the system. Water table may be present, and ponding may occur in isolated areas.
VX226X00A104 – Aleutian Riparian and Lake Shore Complex
VX226X00A104 – Aleutian Riparian and Lake Shore Complex
Soils driven by ponding and a fluctuating water table. Site associated with depressions and organic soils on upland positions.
VX226X00A115 – Aleutian Organic Wet Depressions
VX226X00A115 – Aleutian Organic Wet Depressions
Volcanic landforms and parent material (lava flows) and volcanics weathering in place.
Landforms other than volcanic, with potential for secondary volcanic influence
Volcanic landforms including volcanic cones and lava flows
VX226X00A102 – Aleutian Dwarf Scrub Volcanics
VX226X00A102 – Aleutian Dwarf Scrub Volcanics
Volcanic influenced soils
Organic soils on lower to moderately sloping landforms (hills, plains, terraces, dipslopes). With at least a 2-inch organic cap. Influenced by Ash and/or tephra.
VX226X00A113 – Aleutian Shrub Meadow Ashy Slopes
VX226X00A113 – Aleutian Shrub Meadow Ashy Slopes
Soils on steep soils with ash influence or derived from basalt and tephra on steeply sloping mountains and dip slopes.
VX226X00A107 – Aleutian Steep Tundra Slopes
VX226X00A107 – Aleutian Steep Tundra Slopes
Steep, eroded or shallow soils
VX226X00A109 – Aleutian Shallow Cliffs and Slopes
VX226X00A109 – Aleutian Shallow Cliffs and Slopes
Lower sloping and depositional soils
Eolian or wind deposited soils on hills and plains.
VX226X00A110 – Aleutian Eolian Plains and Hills
VX226X00A110 – Aleutian Eolian Plains and Hills
Alluvial or other depositional soils
Soils developed on terraces and floodplain steps
VX226X00A114 – Aleutian Dwarf Shrub Terraces
VX226X00A114 – Aleutian Dwarf Shrub Terraces
Hill slopes and dip slopes gentle rolling meadows. No water table, dry upland communities at low elevations.
VX226X00A112 – Aleutian Rolling Meadow Lowlands
VX226X00A112 – Aleutian Rolling Meadow Lowlands
Long term average mean annual precipitation
- No filter
- 60 – 80cm (24 – 31in)
- 80 – 100cm (31 – 39in)
- 100 – 120cm (39 – 47in)
- 120 – 140cm (47 – 55in)
—
cm
Long term average frost free days
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- 70 – 90days
- 90 – 110days
- 110 – 130days
—
days
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- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
- 600 – 800m (2000 – 2600ft)
- 800 – 1000m (2600 – 3300ft)
- 1000 – 1200m (3300 – 3900ft)
—
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%
- 80 – 90%
- 90 – 100%
—
%
- No filter
- Alluvial fan
- Beach
- Beach ridge
- Beach terrace
- Coastal plain
- Depression
- Dip slope
- Drainageway
- Dune
- Escarpment
- Flood plain
- Hill
- Hillside
- Lagoon
- Lake
- Lake plain
- Lakebed
- Lakeshore
- Lava flow
- Mountain
- Mountain slope
- Mud flat
- Plain
- Ridge
- Scarp slope
- Sea cliff
- Strand plain
- Stream terrace
- Terrace
- Tidal flat
- Tidal marsh
- Valley flat
- Volcanic cone
- No filter
- Basalt
- Igneous and sedimentary
- Igneous, unspecified
- Scoria
- Sedimentary, unspecified
- Volcanic breccia, acidic
- No filter
- Alluvium
- Cinders
- Colluvium
- Drift
- Eolian deposits
- Lacustrine deposits
- Marine deposits
- Organic, grassy material
- Organic, unspecified
- Outwash
- Residuum
- Scoria
- Tephra
- Volcanic ash
Soil surface texture
- No filter
- Coarse sand
- Fine sandy loam
- Loam
- Loamy sand
- Sand
- Silt
- Silty clay loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 226X PES Key
I.
Soils associated with coastal, lowland, and upland water driven sites.
B.
Inland (freshwater) ecological sites
1
Riparian and lake shore soils, with flooding the dominant driver of the system. Water table may be present, and ponding may occur in isolated areas.
... VX226X00A104 – Aleutian Riparian and Lake Shore Complex
2
Soils driven by ponding and a fluctuating water table. Site associated with depressions and organic soils on upland positions.
... VX226X00A115 – Aleutian Organic Wet Depressions
II.
Soils not associated with water driven sites.
A.
Volcanic landforms and parent material (lava flows) and volcanics weathering in place.
1
Volcanic landforms including volcanic cones and lava flows
... VX226X00A102 – Aleutian Dwarf Scrub Volcanics
2
Volcanic influenced soils
i.
Organic soils on lower to moderately sloping landforms (hills, plains, terraces, dipslopes). With at least a 2-inch organic cap. Influenced by Ash and/or tephra.
... VX226X00A113 – Aleutian Shrub Meadow Ashy Slopes
ii.
Soils on steep soils with ash influence or derived from basalt and tephra on steeply sloping mountains and dip slopes.
... VX226X00A107 – Aleutian Steep Tundra Slopes
B.
Landforms other than volcanic, with potential for secondary volcanic influence
2
Lower sloping and depositional soils
i.
Eolian or wind deposited soils on hills and plains.
... VX226X00A110 – Aleutian Eolian Plains and Hills
ii.
Alluvial or other depositional soils
a.
Soils developed on terraces and floodplain steps
... VX226X00A114 – Aleutian Dwarf Shrub Terraces
b.
Hill slopes and dip slopes gentle rolling meadows. No water table, dry upland communities at low elevations.
... VX226X00A112 – Aleutian Rolling Meadow Lowlands
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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