Major Land Resource Area 081C
Edwards Plateau, Eastern Part
Accessed: 12/21/2024
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i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
- Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, less than 20% slopes
- Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes less than 20%
- Shallow loam to clay loam soils (10-20”(25-50cm)) over cemented limestone with interbedded limestone bedrock, very calcic (greater than 40% CCE), violent effervesces
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i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
- Sites are not affected by soil chemistry
- Soils are deep to very deep (>40” (100cm))
- Soils are clay texture, non-calcareous with high shrink-swell and large cracks when soils are dry
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i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
- Soils highly calcareous (>15% CCE within top 20” (50cm))
- Sites without high volume of coarse fragments. Moderately deep to very deep clay loam to clay soils on stream terraces
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i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
- Sites are not affected by soil chemistry
- Soils are deep to very deep (>40” (100cm))
- Soils are Loam to clay loam texture, non-calcareous on hillslopes and plateaus
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i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
- Soils highly calcareous (>15% CCE within top 20” (50cm))
- Sites with a high volume of coarse fragments in top 20” (>35% by volume). Site occurs along terrace breaks, steep slopes, or terraces with coarse fragments up to 10” diameter covering 50-75% of surface and making up 40-50% volume in top 20” (50cm). These upland sites occur on gravelly clay loam soils over limestone on hills
-
i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
- Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, less than 20% slopes
- Site without highly calcareous subsoil or bedrock, OR if lime horizon present, accompanied by high volume of coarse fragments at soil surface, slopes less than 10%
- Site occurs on ridges with coarse fragments up to 10” diameter covering 40-75% of surface and making up 40-75% volume in top 20” (50cm), soils are well drained clays and clay loams
-
i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
- Sites are not affected by soil chemistry
- Soils are moderately deep (20-40” (50-100cm)). Soils are Loam to clay loam texture, non-calcareous on hillslopes and plateaus
-
i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
- Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, greater than 20% slopes
- Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes greater than 20%
- Shallow loam to clay loam soils (10-20”(25-50cm)) over cemented limestone with interbedded limestone bedrock, very calcic (greater than 40% CCE), violent effervesces
-
i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
- Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, greater than 20% slopes
- Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes greater than 20%
- Shallow silty clay to clay soils (10-20”(25-50cm)), often gravelly to stony with slopes less than 20%, underlain by hard calcareous materials
-
i
Key Characteristics
- Site in a lowland position (bottom) that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
- Soils are less than 35% clay in the mineral soil. Site is very deep with well drained, moderate to rapid permeability soils on flood plains
-
i
Key Characteristics
- Site not in a lowland position, and does not receive significant additional moisture.
- Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
- Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, less than 20% slopes
- Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes less than 20%
- Shallow silty clay to clay soils (10-20”(25-50cm)), often gravelly to stony with slopes less than 20%, underlain by hard calcareous materials
-
i
Key Characteristics
- Site in a lowland position (bottom) that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
- A. Soils are greater than 35% clay in the mineral soil. Site is very deep with moderately well drained, very slow permeable soils on flood plains of streams
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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.
Ecological site keys
MLRA 81C Site Key
I.
Site in a lowland position (bottom) that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
A.
A. Soils are greater than 35% clay in the mineral soil. Site is very deep with moderately well drained, very slow permeable soils on flood plains of streams
... R081CY699TX – Clayey Bottomland 29-35" PZ
B.
Soils are less than 35% clay in the mineral soil. Site is very deep with well drained, moderate to rapid permeability soils on flood plains
... R081CY561TX – Loamy Bottomland 29-35 PZ
II.
Site not in a lowland position, and does not receive significant additional moisture.
A.
Soil depth very shallow (<10” (25cm)), shallow (10-20” (25-50cm)) skeletal (>35% coarse fragments by volume in top 20” (50cm”)) soils on south and west aspects and/or with a root restricting layer which react like shallow soils
1
Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, less than 20% slopes
i.
Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes less than 20%
a.
Shallow loam to clay loam soils (10-20”(25-50cm)) over cemented limestone with interbedded limestone bedrock, very calcic (greater than 40% CCE), violent effervesces
... R081CY355TX – Adobe 29-35 PZ
b.
Shallow silty clay to clay soils (10-20”(25-50cm)), often gravelly to stony with slopes less than 20%, underlain by hard calcareous materials
... R081CY574TX – Shallow 29-35 PZ
ii.
Site without highly calcareous subsoil or bedrock, OR if lime horizon present, accompanied by high volume of coarse fragments at soil surface, slopes less than 10%
a.
Site occurs on ridges with coarse fragments up to 10” diameter covering 40-75% of surface and making up 40-75% volume in top 20” (50cm), soils are well drained clays and clay loams
... R081CY360TX – Low Stony Hill 29-35 PZ
2
Soils shallow (10-20” (25-50cm)), but may include moderately deep to deep (>20” (>50cm)) skeletal soils, greater than 20% slopes
i.
Site with a highly calcareous subsoil (<10” (25cm)), often gravelly or skeletal subsoil OR underlain by hard calcareous materials and slopes greater than 20%
a.
Shallow loam to clay loam soils (10-20”(25-50cm)) over cemented limestone with interbedded limestone bedrock, very calcic (greater than 40% CCE), violent effervesces
... R081CY362TX – Steep Adobe 29-35 PZ
b.
Shallow silty clay to clay soils (10-20”(25-50cm)), often gravelly to stony with slopes less than 20%, underlain by hard calcareous materials
... R081CY363TX – Steep Rocky 29-35 PZ
B.
Soil depth moderately deep to deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
1
Soils highly calcareous (>15% CCE within top 20” (50cm))
i.
Sites with a high volume of coarse fragments in top 20” (>35% by volume). Site occurs along terrace breaks, steep slopes, or terraces with coarse fragments up to 10” diameter covering 50-75% of surface and making up 40-50% volume in top 20” (50cm). These upland sites occur on gravelly clay loam soils over limestone on hills
... R081CY359TX – Gravelly Redland 29-35 PZ
ii.
Sites without high volume of coarse fragments. Moderately deep to very deep clay loam to clay soils on stream terraces
... R081CY357TX – Clay Loam 29-35 PZ
2
Sites are not affected by soil chemistry
i.
Soils are moderately deep (20-40” (50-100cm)). Soils are Loam to clay loam texture, non-calcareous on hillslopes and plateaus
... R081CY361TX – Redland 29-35 PZ
ii.
Soils are deep to very deep (>40” (100cm))
a.
Soils are clay texture, non-calcareous with high shrink-swell and large cracks when soils are dry
... R081CY356TX – Blackland 29-35 PZ
b.
Soils are Loam to clay loam texture, non-calcareous on hillslopes and plateaus
... R081CY358TX – Deep Redland 29-35 PZ
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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.
