Vegetation Classification and Mapping Project Report - USGS

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Appendix C: Global and local plant community descriptions C.3 Shrubland C.3.6. Forestiera pubescens Shrubland Base map class NatureServe common name NatureServe code Not.mapped Wild.Privet.Shrubland CEGL001168 Summary: This shrubland association is reported from canyon bottoms, floodplains, sandy terraces along major rivers, and washes in southwestern Colorado, northeastern Arizona, and southeastern Utah. Elevation ranges from 1340 to 1680 m (4400-5500 ft). Stands typically form a narrow, but continuous, band about 3 m above the channel on streambanks and natural levees at the interface between the riparian zone and drier uplands. They occur on the outer edge of the active floodplain. Soils range from silty clays over clay loam to sandy loam derived from alluvium. This shrubland consists of a dense to open canopy of Forestiera pubescens, often with Atriplex canescens, Ericameria nauseosa, or Rhus trilobata, on the flat benches and floodplains adjacent to and above the river channel. There is often a mix of riparian and upland vegetation in these areas, with Salix exigua forming a dense band along the stream edge. This dense riparian shrubland can form a narrow, unfragmented, continuous cover that may alternate creekside to creekside, as part of the natural mosaic of the floodplain for one-tenth of a mile to several miles. Phragmites australis, a tall erect grass, or Sporobolus airoides often occur among the shrubs, with Artemisia tridentata, Ericameria nauseosa (= Chrysothamnus nauseosus), or pinyon-juniper dominating the adjacent upland vegetation. The dominance or codominance Forestiera pubescens in the shrub layer characterizes this association. Classification confidence: 2 - Moderate. Classification comments: Globally. More survey and classification work is needed to clarify the concept of this association throughout its range. It may be possible to split into more associations based on understory dominants. Petrified Forest National Park. Data are not available. Vegetation hierarchy: Physiognomic class III Shrubland Physiognomic subclass III.B. Deciduous.shrubland Physiognomic group III.B.2. Cold-deciduous.shrubland Physiognomic subgroup III.B.2.N. Natural/Semi-natural.cold-deciduous.shrubland Formation name III.B.2.N.d. Temporarily.flooded.cold-deciduous.shrubland Alliance name Forestiera pubescens.Temporarily.Flooded.Shrubland. Alliance.(A.969),.Wild.Privet.Temporarily.Flooded. Shrubland.Alliance Ecological systems placement: Ecological system unique ID CES306.821 Ecological system name Rocky.Mountain.Lower.Montane-Foothill.Riparian.Woodland. and.Shrubland C29
Vegetation Classification and Distribution Mapping Report: Petrified Forest National Park NatureServe conservation status: Global rank. G1G2 (30-Nov-1998). The Forestiera pubescens riparian shrubland has not been documented outside of a few locations in Colorado. It probably occurs in Utah, Arizona, and New Mexico, although not in any great abundance. Indications of its possible presence are inferred from (1) the Flora of Utah, which lists fourteen collections of Forestiera pubescens from sandy terraces along the Colorado and San Juan rivers, and smaller tributaries in Emery, Garfield, Grand, Kane, San Juan, and Wayne counties (Welsh et al. 1987), and (2) Arizona floras that list Forestiera pubescens as Forestiera neomexicana (a synonym), but do not record the number or location of the collections. Livestock grazing is limited in this plant association due to the dense shrub cover, and Forestiera pubescens is not very palatable to livestock. Distribution: Globally. This association is known from Colorado in the San Miguel/Dolores River Basin. Petrified Forest National Park. This association occurred adjacent to the Puerco River west of U.S. Highway 191. Environmental summary: Globally. This shrubland association is reported from canyon bottoms, floodplains, sandy terraces along major rivers, and washes in southwestern Colorado, northeastern Arizona, and southeastern Utah. Elevation ranges from 1340 to 1680 m (4400-5500 ft). Stands typically form a narrow, but continuous, band about 3 m above the channel on streambanks and natural levees at the interface between the riparian zone and drier uplands. They occur on the outer edge of the active floodplain. Soils range from silty clays over clay loam to sandy loam derived from alluvium.. Petrified Forest National Park. This association occurred in a valley bottom at 1503 m (4930 ft) elevation. The site was a level, intermittently flooded area adjacent to the Puerco River. The substrate was a sandy loam soil. USFWS wetland system: Palustrine. Vegetation description: Globally. This shrubland consists of a dense to open canopy of Forestiera pubescens, often with Atriplex canescens, Ericameria nauseosa, or Rhus trilobata, on the flat benches and floodplains adjacent to and above the river channel. There is often a mix of riparian and upland vegetation in these areas, with Salix exigua mixing or forming a dense band along the stream edge. This dense riparian shrubland can form a narrow, unfragmented, continuous cover that may alternate creekside to creekside, as part of the natural mosaic of the floodplain for onetenth of a mile to several miles. Phragmites australis, a tall erect grass, or Sporobolus airoides often occur among the shrubs. Common forbs include Descurainia pinnata, Chenopodium album, and Stanleya pinnata. The invasive, exotic shrub Tamarix chinensis may be present to codominant in some stands. Artemisia tridentata, Ericameria nauseosa, or pinyon-juniper often dominate the adjacent upland vegetation. This appears to be a flood-tolerant association which may be excluded from grazing due to the density of shrub cover. Petrified Forest National Park. Only one relevé was classified as Forestiera pubescens Shrubland, with total vegetation cover of 56%. The vegetation cover consisted of 37% cover in the shrub stratum and 19% cover in the herbaceous stratum. The species diversity was low, with only six species. The shrub layer was characterized by Forestiera pubescens with 12% cover and with common associates Atriplex canescens (7% cover) and Ericameria nauseosa (14% cover). The herbaceous layer was dominated by Sporobolus airoides with 18% cover. C30
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National Park Service U.S. Departme
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Vegetation Classification and Distr
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The National Park Service, Natural
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Acronyms and Abbreviations AA ac AP
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Executive Summary The classificatio
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Acknowledgments Behind the authors
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Axis 3 Axis 2 Vegetation Classifica
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Appendix D Plant species list The s
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D3 Appendix D continued Scientific
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Appendix E Plant community and map
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Appendix E: Plant community and map
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Appendix F Plant community and map
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F3 Appendix F continued Plant commu
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Appendix F continued Plant communit
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G4 B1 Cottonwood / Rubber Rabbitbru
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G6 B3 Blue Sage Dwarf-Shrubland Fig
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G8 B5 Copperweed - Alkali Sacaton S
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G10 B7 Drummond Goldenweed - Gallet
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G12 B9 Greasewood / New Mexico Salt
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G14 B11 Iodine Bush Shrubland Figur
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G16 B13 Sandsage Colorado Plateau S
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G18 B15 Tamarisk Shrubland Figure.G
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G20 B17 Winter-fat / Blue Grama Dwa
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G22 B19 Alkali Sacaton - Blue Grama
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G24 B21 Blue Grama Herbaceous Veget
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G26 B23 Galleta - Alkali Sacaton He
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G28 B25 New Mexico Saltbush / Alkal
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G30 B27 Russian Thistle Sand Dune V
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G32 B29 Arizona Siltbush Sparse Veg
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G34 B31 Slender Buckwheat Sparse Ve
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G36 B33 Airstrip Figure.G65..Photos
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G38 B35 Barren Wash Figure.G68..Gro
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G40 B37 Park Sites Figure.G71..Phot
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G42 B39 Residences Figure.G73..Phot
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G44 B41 Run-off Control Feature Fig
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G46 B43 Stock Ponds Figure.G77..Pho
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G48 B45 Vegetated Wash Complex Figu
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Appendix H: Accuracy Assessment Dat
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Table H-4. Contingency table: Manag
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The Department of the Interior prot
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