Major Land Resource Area 190X
Stratovolcanoes of the Mariana Islands
Accessed: 10/09/2025
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Ecological site list
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i
Key Characteristics
- Depth to water not as above; not aquic, soils moderately well to well drained
- Soil depth class is very shallow (1 to 10 in.)
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Key Characteristics
- ¹ ² Depth to water shallow (0-10 in.); aquic, soils somewhat poorly drained
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Key Characteristics
- Depth to water not as above; not aquic, soils moderately well to well drained
- Soil depth class is moderately deep (30 to 40 in), deep (40 to 60) or very deep (60 in or greater)
- Soil surface texture is loamy sand
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Key Characteristics
- Depth to water not as above; not aquic, soils moderately well to well drained
- Soil depth class is moderately deep (30 to 40 in), deep (40 to 60) or very deep (60 in or greater)
- Soil surface texture is sandy loam to loam
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Key Characteristics
- Depth to water not as above; not aquic, soils moderately well to well drained
- Soil depth class is moderately deep (30 to 40 in), deep (40 to 60) or very deep (60 in or greater)
- Soil surface texture is silt loam
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Ecological site keys
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1 Notes from David Clausnitzer: The PESs under II. in the key can all be differentiated by available water holding capacity: Very Shallow (R-001) has AWC of 1 inch (2 cm) due to shallowness and gravel content. Loamy Sand (F-502) has AWC of 3 inches (8 cm) associated with surface texture of ashy loamy sand over subsoil of ashy sand. Sandy Loam or Loam (F-503) has AWC of 4 to 6 inches (9 to 16 cm) associated with surface texture of ashy sandy loam over subsurface of ashy loam over ashy loamy sand or surface texture of ashy loam over subsurface of ashy loamy sand over sand. Silt Loam (F-504) has AWC of 10 to 14 inches (25 to 35 cm) associated with surface texture of ashy silt loam over subsurface of ashy loam, or surface texture of ashy silt loam over subsurface with coarser textures, or one soil with surface texture of ashy sandy loam over subsurface of ashy loam over ashy loamy sand (same as some soils in F-503) but a deep phase of that soil. The surface textures of the soils
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2 John Proctor incorporated edits suggested by Sarah Quistberg to MLRA 190 Key drafted by David. Those changes are reflected in the current key in EDIT.
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