Major Land Resource Area 197X
Volcanic Islands of American Samoa
Accessed: 10/09/2025
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Select an ecological site
Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
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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.
Ecological site list
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Key Characteristics
- Soils that undergo periodic or occasional flooding
- Soils that have a perennial high water table (<3 feet from surface)
- Not tidal; fresh water
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Key Characteristics
- Soils that undergo periodic or occasional flooding
- Soils that have a perennial high water table (<3 feet from surface)
- Tidal (twice daily); saline sea water
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Key Characteristics
- Soils that undergo periodic or occasional flooding
- Soils that do not have a perennial high water table (>3 feet from surface)
- Sandy soils derived from coral
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Key Characteristics
- Soils that do not undergo flooding
- Organic soils (Folists) in aa lava
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Key Characteristics
- Soils that undergo periodic or occasional flooding
- Soils that do not have a perennial high water table (>3 feet from surface)
- Silty clay or silty clay loam soils derived from alluvium
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Key Characteristics
- Soils that do not undergo flooding
- Mineral soils
- Areas that receive average annual rainfall greater than 155 inches
- Soils with slopes less than 70 percent
- Skeletal soils
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Key Characteristics
- Soils that do not undergo flooding
- Mineral soils
- Areas that receive average annual rainfall greater than 155 inches
- Soils with slopes less than 70 percent
- Non-skeletal soils
- Formed in volcanic ash or residuum over tuff or rock
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Key Characteristics
- Soils that do not undergo flooding
- Mineral soils
- Areas that receive average annual rainfall less than 155 inches
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Key Characteristics
- Soils that do not undergo flooding
- Mineral soils
- Areas that receive average annual rainfall greater than 155 inches
- Soils with slopes less than 70 percent
- Non-skeletal soils
- Formed in volcanic ash deposited over cinders
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Key Characteristics
- Soils that do not undergo flooding
- Mineral soils
- Areas that receive average annual rainfall greater than 155 inches
- Soils with slopes greater than 70 percent
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
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.
