Major Land Resource Area 118A
Arkansas Valley and Ridges, Eastern Part
Accessed: 10/07/2024
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Ecological site list
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Key Characteristics
- Site does not receive additional moisture from the surrounding landscape (side slopes, plateaus, and ridges), soils formed in residuum and colluvium.
- Soils are less than 50 cm to restrictive layer (shallow).
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Key Characteristics
- Site does not receive additional moisture from the surrounding landscape (side slopes, plateaus, and ridges), soils formed in residuum and colluvium.
- Soil greater than or equal to 50 cm to restrictive layer (moderately deep, deep, or very deep).
- Occurs on linear to convex backslope or side slopes of paleoterraces, plateaus, and ridges.
- Less than 35 percent clay (fine-loamy or fine-silty) in particle size control section with a layer of clay accumulation within 10 to 35 cm from the soil surface.
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Key Characteristics
- Site receives additional moisture from the surrounding landscape (flood plains, terraces, and foot slopes), soils formed in alluvium.
- Rare (1 to 5 times in 100 years) to frequent (greater than 50 times in 100 years) flooding occurs.
- Occurs on paleoterraces or high terraces and are subject to rare flooding for brief periods (2- less than 7 days).
- Soils are well to moderately well drained and characterized by a layer of clay accumulation within 25 to 50 cm from the soil surface.
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Key Characteristics
- Site receives additional moisture from the surrounding landscape (flood plains, terraces, and foot slopes), soils formed in alluvium.
- Rare (1 to 5 times in 100 years) to frequent (greater than 50 times in 100 years) flooding occurs.
- Occurs on flood plains.
- Soils are somewhat poorly to poorly drained and characterized by greater than 60 percent clay in the particle size control section and a layer of clay accumulation 20 to 30 cm from the surface.
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Key Characteristics
- Site does not receive additional moisture from the surrounding landscape (side slopes, plateaus, and ridges), soils formed in residuum and colluvium.
- Soil greater than or equal to 50 cm to restrictive layer (moderately deep, deep, or very deep).
- Occurs on linear to convex backslope or side slopes of paleoterraces, plateaus, and ridges.
- Greater than 35 percent clay (fine) in the particle size control section with a layer of clay accumulation within 25 cm of the soil surface.
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Key Characteristics
- Site does not receive additional moisture from the surrounding landscape (side slopes, plateaus, and ridges), soils formed in residuum and colluvium.
- Soil greater than or equal to 50 cm to restrictive layer (moderately deep, deep, or very deep).
- Occurs on gently sloping to concave uplands.
- Greater than 35 percent clay (fine) in the particle size control section and moderately to strongly alkaline (pH 7.9 to 9.0) below 25 cm.
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Key Characteristics
- Site receives additional moisture from the surrounding landscape (flood plains, terraces, and foot slopes), soils formed in alluvium.
- Flooding does not occur.
- Soils are well to moderately well drained and characterized by a layer of clay accumulation within 25 to 50 cm from the soil surface.
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i
Key Characteristics
- Site receives additional moisture from the surrounding landscape (flood plains, terraces, and foot slopes), soils formed in alluvium.
- Rare (1 to 5 times in 100 years) to frequent (greater than 50 times in 100 years) flooding occurs.
- Occurs on flood plains.
- Soils are well to moderately well drained and characterized by an irregular decrease in organic carbon, stratified textures and/or a buried A horizon (fluventic soils).
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