Major Land Resource Area 023X
Malheur High Plateau
Accessed: 12/21/2024
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Next, learn more about the selected ecological site group and its characteristic dynamics by browsing the ecological site group description and exploring alternative state and transition model formats.
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Viewing 20 of 21
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-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are tree dominated
- Elevations < 7000'
- Soils Clayey at PCS
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are tree dominated
- Elevations < 7000'
- Soils loamy or ashy
- Frost free days < 100
- Soils very shallow (depth ≤ 12")
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are tree dominated
- Elevation > 7000'
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- MAP ≤ 10"
- Soil texture (PCS) clayey
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soils is shallow to root restrictive layer
- Soils Molisols
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ProvisionalR023XY902ORShallow and Moderately Deep >12 PZ Low and Lahontan sagebrush and Idaho fescueiKey Characteristics
- Site does not pond or flood
- Landform other than dunes
- Soil surface is clayey
- MAP > 10"
- Soil Temperature Regime Frigid. Frost Free Days per Year < 80
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soil is moderately deep or deeper
- Site on other aspects or landforms
- Soil textures (PCS) ashy
- Sites are on backslopes of ash flow landforms
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ProvisionalR023XY904NVCobbly Moderately Deep Clay 10-14 PZ Low or Lahontan Sagebrush and Sandberg bluegrassi
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Soil surface is clayey
- MAP > 10"
- Soils warmer than frigid.
- Soils weekly reactive or less.
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soil is moderately deep or deeper
- Site is on south aspect of plateau landscapes
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soil is moderately deep or deeper
- Site on other aspects or landforms
- Soil textures (PCS) ashy
- Sites are on plateau summits and shoulders
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-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soil is moderately deep or deeper
- Site on other aspects or landforms
- Soils texture (PCS) loamy
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ProvisionalR023XY909ORClayey Mesic Plateaus 8-14 PZ Wyoming Big Sagebrush and Thurber's Needlegrassi
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- MAP ≤ 10"
- Texture (PCS) ashy or loamy
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Soil surface is clayey
- MAP ≤ 10"
-
i
Key Characteristics
- Site subject to Ponding or Flooding
- Site is not sodic
- Soils are clayey
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are shrub or grass dominated
- [Criteria]MAP >10"
- Soils is shallow to root restrictive layer
- Soils Aridisols
-
i
Key Characteristics
- Site does not pond or flood
- Site on dune landform
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Soil surface is clayey
- MAP > 10"
- Soils warmer than frigid.
- Soils extremely reactive and may have visible concentrations of CaCO3.
-
i
Key Characteristics
- Site subject to Ponding or Flooding
- Site is not sodic
- Soils are loamy
-
i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are tree dominated
- Elevations < 7000'
- Soils loamy or ashy
- Frost free days < 100
- Soils > 12" deep.
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ProvisionalR023XY918NVMountain Slope 10-12 PZ Utah Juniper with Thurber's Needlegrass and Sagebrush.i
Key Characteristics
- Site does not pond or flood
- Landform other than dunes
- Surface soils are not clayey
- Sites are tree dominated
- Elevations < 7000'
- Soils loamy or ashy
- Frost free days per year ≥ 100
-
i
Key Characteristics
- Site subject to Ponding or Flooding
- Site has sodic soils properties
Ecological site group keys
Key to Group Modal Sites
I.
Site subject to Ponding or Flooding
B.
Site is not sodic
A.
Site has sodic soils properties
... R023XY924CA – Lake Basins and Terraces with Greasewood and Saltgrass
II.
Site does not pond or flood
B.
Landform other than dunes
1
Soil surface is clayey
i.
MAP ≤ 10"
... R023XY910NV – Very Shallow Mesic Plateaus Low Production Wyoming and Lahontan Sagebrush sites with Sparse Juniper
ii.
MAP > 10"
a.
Soil Temperature Regime Frigid. Frost Free Days per Year < 80
... R023XY902OR – Shallow and Moderately Deep >12 PZ Low and Lahontan sagebrush and Idaho fescue
b.
Soils warmer than frigid.
1)
Soils extremely reactive and may have visible concentrations of CaCO3.
... R023XY915NV – Clayey Plateaus 10-12 PZ Sagebrush with Rhizomatous Grass
2)
Soils weekly reactive or less.
... R023XY904NV – Cobbly Moderately Deep Clay 10-14 PZ Low or Lahontan Sagebrush and Sandberg bluegrass
2
Surface soils are not clayey
i.
Sites are tree dominated
b.
Elevations < 7000'
1)
Soils Clayey at PCS
... F023XY919NV – Plateau Rims 12-16" PZ Western Juniper with Low Sagebrush and Idaho Fescue
2)
Soils loamy or ashy
a)
Frost free days per year ≥ 100
... R023XY918NV – Mountain Slope 10-12 PZ Utah Juniper with Thurber's Needlegrass and Sagebrush.
b)
Frost free days < 100
(1)
Soils very shallow (depth ≤ 12")
... F023XY920NV – Mountain Slopes 10-14 PZ Juniper and Mountain Big Sagebrush
ii.
Sites are shrub or grass dominated
b.
MAP ≤ 10"
1)
Soil texture (PCS) clayey
... R023XY901NV – Shallow and Moderately Deep <12" PZ Low and Lahontan sagebrush and bluebunch wheatgrass/Thurber's needlegrass
2)
Texture (PCS) ashy or loamy
... R023XY909OR – Clayey Mesic Plateaus 8-14 PZ Wyoming Big Sagebrush and Thurber's Needlegrass
a.
[Criteria]MAP >10"
1)
Soils is shallow to root restrictive layer
b)
Soils Molisols
... R023XY901NV – Shallow and Moderately Deep <12" PZ Low and Lahontan sagebrush and bluebunch wheatgrass/Thurber's needlegrass
2)
Soil is moderately deep or deeper
a)
Site is on south aspect of plateau landscapes
... R023XY905NV – Loamy 10-20 PZ Mountain Big Sagebrush and Bluebunch Wheatgrass
b)
Site on other aspects or landforms
(1)
Soils texture (PCS) loamy
... R023XY908NV – Loamy 14-18 PZ Mountain Big Sagebrush and Mountain Brome
(2)
Soil textures (PCS) ashy
(a)
Sites are on backslopes of ash flow landforms
... R023XY903NV – Ashy 10-14 PZ Lahontan Sagebrush
(b)
Sites are on plateau summits and shoulders
... R023XY906NV – Ashy or Loamy Skeletal Moderately Deep 10-20 PZ High-Resilience Mountain Big Sagebrush and Idaho Fescue
Ecological site group photos
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Ecological site groups
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.
