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GREAT BASIN PINYON-JUNIPER WOODLAND ( S040)
Division 304, Forest and Woodland, CES304.773
Spatial Scale & Pattern: Matrix Classification Confidence: medium
Required Classifiers: Natural/Semi-natural, Vegetated (>10% vasc.), Upland
Diagnostic Classifiers: Montane [Lower Montane], Lowland [Foothill], Forest and Woodland (Treed), Foothill(s), Piedmont, Plateau, Ridge/Summit/Upper Slope, Aridic, Pinus monophylla, Juniperus osteosperma
Non-Diagnostic Classifiers: Sideslope, Temperate [Temperate Continental], Alkaline Soil, Long Disturbance Interval, F-Patch/Medium Intensity
Concept Summary: This ecological system occurs on dry mountain ranges of the Great Basin region and eastern foothills of the Sierra Nevada. It is typically found at lower elevations ranging from 1600-2600 m. These woodlands occur on warm, dry sites on mountain slopes, mesas, plateaus, and ridges. Severe climatic events occurring during the growing season, such as frosts and drought, are thought to limit the distribution of pinyon-juniper woodlands to relatively narrow altitudinal belts on mountainsides. Woodlands dominated by a mix of Pinus monophylla andJuniperus osteosperma, pure or nearly pure occurrences of Pinus monophylla, or woodlands dominated solely by Juniperus osteosperma comprise this system. Cercocarpus ledifolius is a common associate. Understory layers are variable. Associated species include shrubs such as Arctostaphylos patula, Artemisia arbuscula, Artemisia nova, Artemisia tridentata, Cercocarpus ledifolius, Cercocarpus intricatus, Coleogyne ramosissima, Quercus gambelii, Quercus turbinella, and bunch grasses Hesperostipa comata, Festuca idahoensis, Pseudoroegneria spicata, Leymus cinereus (= Elymus cinereus), and Poa fendleriana. This system occurs at lower elevations than Colorado Plateau Pinyon-Juniper Woodland (CES304.767) where sympatric.
DISTRIBUTION
Range: Occurs on dry mountain ranges of the Great Basin region and eastern foothills of the Sierra Nevada, typically at lower elevations ranging from 1600-2600 m.
Ecological Divisions: 206, 304
TNC Ecoregions: 11:C, 12:C, 18:C
Subnations/Nations: CA:c, NV:c, UT:c
CONCEPT
Alliances and Associations:
• JUNIPERUS OSTEOSPERMA WOODLAND ALLIANCE (A.536) Juniperus osteosperma / Artemisia arbuscula Woodland (CEGL002757) Juniperus osteosperma / Artemisia nova / Rock Woodland (CEGL000729) Juniperus osteosperma / Artemisia nova Woodland (CEGL000728) Juniperus osteosperma / Artemisia tridentata / Achnatherum hymenoides Woodland (CEGL000731) Juniperus osteosperma / Cercocarpus intricatus Woodland (CEGL000733) Juniperus osteosperma / Pseudoroegneria spicata Woodland (CEGL000738) Juniperus osteosperma / Sparse Understory Woodland (CEGL000732)
• JUNIPERUS SCOPULORUM TEMPORARILY FLOODED WOODLAND ALLIANCE (A.563) Juniperus scopulorum Temporarily Flooded Woodland [Placeholder] (CEGL002777)
• PINUS MONOPHYLLA - (JUNIPERUS OSTEOSPERMA) WOODLAND ALLIANCE (A.543) Pinus monophylla - Juniperus osteosperma - Quercus gambelii / Artemisia tridentata Woodland (CEGL000837) Pinus monophylla - Juniperus osteosperma / (Shepherdia rotundifolia, Amelanchier utahensis) Woodland (CEGL002942) Pinus monophylla - Juniperus osteosperma / Artemisia arbuscula Woodland (CEGL000830) Pinus monophylla - Juniperus osteosperma / Artemisia nova Woodland (CEGL000831) Pinus monophylla - Juniperus osteosperma / Artemisia tridentata ssp. vaseyana / Pseudoroegneria spicata Woodland (CEGL000833) Pinus monophylla - Juniperus osteosperma / Artemisia tridentata Woodland (CEGL000832) Pinus monophylla - Juniperus osteosperma / Cercocarpus ledifolius / Pseudoroegneria spicata Woodland (CEGL000834) Pinus monophylla - Juniperus osteosperma / Cercocarpus montanus - Quercus gambelii Woodland [Provisional] (CEGL002968) Pinus monophylla - Juniperus osteosperma / Coleogyne ramosissima Woodland [Provisional] (CEGL002971) Pinus monophylla - Juniperus osteosperma / Gutierrezia sarothrae / Pleuraphis jamesii Woodland [Provisional] (CEGL002970) Pinus monophylla - Juniperus osteosperma / Hesperostipa comata Woodland (CEGL002969) Pinus monophylla - Juniperus osteosperma / Prunus virginiana Woodland (CEGL000836) Pinus monophylla - Juniperus osteosperma / Quercus turbinella Woodland (CEGL002941) Pinus monophylla - Juniperus osteosperma / Sparse Understory Woodland (CEGL000829) Pinus monophylla - Quercus gambelii / Artemisia tridentata Woodland (CEGL000838) Pinus monophylla / Amelanchier alnifolia / Arctostaphylos patula Woodland (CEGL000826) Pinus monophylla / Artemisia tridentata Woodland (CEGL000827) Pinus monophylla / Cercocarpus ledifolius Woodland (CEGL000828) Pinus monophylla / Symphoricarpos oreophilus - Artemisia tridentata Woodland (CEGL000839) Pinus monophylla Woodland (CEGL000825)
• PINUS MONOPHYLLA WOODED TALL HERBACEOUS ALLIANCE (A.1487) Pinus monophylla - Juniperus osteosperma / Leymus cinereus Wooded Herbaceous Vegetation (CEGL000835)
• QUERCUS TURBINELLA SHRUBLAND ALLIANCE (A.793) Quercus turbinella - Juniperus osteosperma Shrubland (CEGL000981)
• California community types:
• Singleleaf Pinyon Woodland (87.040.00)
• Singleleaf Pinyon / Big Sagebrush (87.040.02)
• Singleleaf Pinyon / Green Ephedra (87.040.03)
• Singleleaf Pinyon / Waxberry - Desert Gooseberry (87.040.04)
• Singleleaf Pinyon / Silk Tassle Bush (87.040.05)Singleleaf Pinyon / Utah Juniper / Big Sagebrush - Blackbush (87.040.06)
• Singleleaf Pinyon / Utah Juniper / Black Sagebrush (87.040.07)
• Singleleaf Pinyon / Utah Juniper / Antelope Brush (87.040.07)
• Singleleaf Pinyon / Muller Oak (87.040.08)
• Singleleaf Pinyon / Muller Oak / California Fiddleleaf (87.040.09)
• Singleleaf Pinyon / Desert Almond (87.040.10)
• Singleleaf Pinyon / Desert Gooseberry (87.040.11)
• Singleleaf Pinyon / Curl-leaf Mountain Mahogany / Big Sagebrush - Antelope Bitterbrush (87.040.12)
• Juniper Woodlands (89.000.00)
• Utah Juniper (89.300.01)
• Utah Juniper / Big Sagebrush - Green Ephedra (89.300.02)
• Utah Juniper / Big Sagebrush - Desert Bitterbrush - Nevada Ephedra (89.May 30, 2007.300.04)
• Utah Juniper / Sticky Snakeweed (89.300.05)
• Utah Juniper / Shadscale (89.300.06)
• Utah Juniper / White Bursage (89.300.07)
• Utah Juniper / Blackbush (89.300.08)
• Utah Juniper / Blackbush / Galleta (89.300.09)
• Utah Juniper / Spanish Bayonet (89.300.10)
• Utah Juniper / Nevada Ephedra / Desert Needlegrass (89.300.11)
• Singleleaf Pinyon - Utah Juniper Woodland (89.500.00)
SOURCES
References: Barbour and Major 1977, Holland and Keil 1995
Last updated: 20 Feb 2003
Stakeholders: WCS
Concept Author: NatureServe Western Ecology Team
LeadResp: WCS |
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