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CEGL002693 Acer negundo / Disturbed Understory Riparian Woodland
Type Concept Sentence: No Data Available
Common (Translated Scientific) Name: Box-elder / Disturbed Understory Riparian Woodland
Colloquial Name: No Data Available
Hierarchy Level: Association
Type Concept: This riparian association is found in the Colorado Plateau and other areas of the southwestern U.S. The tree canopy of this association is open and 5-15 m tall. The dominant tree species is Acer negundo alone or with other scattered trees such as Acer glabrum, Juniperus osteosperma, or Juniperus scopulorum. There is a sparse shrub layer up to 2 m tall with Artemisia tridentata, Ericameria nauseosa, Fraxinus anomala, Rhus trilobata, Ribes cereum, Tamarix ramosissima, and (in the south) Quercus gambelii. Herbaceous cover and species composition are variable. The herbaceous stratum may be sparse or dominated by native and introduced species typically found in disturbed areas. Bromus tectorum is common. Other typical species are Heterotheca villosa, Poa pratensis, Sisymbrium altissimum, Lepidium latifolium, Taraxacum officinale, and Verbascum thapsus. Stands occur on upper alluvial terraces below 2015 m (6600 feet) elevation. Sites are on gentle slopes or flat areas near permanent or temporary streams but are rarely flooded because of their location on high, abandoned stream terraces. Soils are usually sandy.
Diagnostic Characteristics: No Data Available
Rationale for Nominal Species or Physiognomic Features: No Data Available
Classification Comments: This association is largely known and described from National Park Service inventory efforts in the Colorado Plateau.
Similar NVC Types: No Data Available
note: No Data Available
Physiognomy and Structure: No Data Available
Floristics: This woodland association has an open to moderately closed (10-80%) tree canopy and moderate to dense total vegetation cover. The tree canopy is between 5 and 15 m tall and dominated by Acer negundo. Acer negundo is also present as seedlings and saplings. Other trees that can be present are Acer glabrum, Juniperus osteosperma, and Juniperus scopulorum. Shrub cover is sparse, though it can be more prominent when the tree canopy is open. The shrub stratum is usually less than 2 m tall and contains species such as Artemisia tridentata ssp. tridentata, Ericameria nauseosa, Fraxinus anomala, Rhus trilobata, Ribes cereum, Tamarix ramosissima, and (in the south) Quercus gambelii. Herbaceous cover and species composition are variable. The herbaceous stratum is dominated by native and introduced species typically found in disturbed areas. Bromus tectorum (exotic) is common. Other typical components of the herbaceous stratum are Boerhavia sp., Conyza canadensis, Heterotheca villosa, Machaeranthera canescens, Poa pratensis, Lepidium latifolium, Sisymbrium altissimum, Taraxacum officinale, and Verbascum thapsus.
Dynamics: The shade provided by the tree canopy and proximity to water make stands of this association attractive to domestic livestock and wildlife. The subsequent grazing, trampling, browsing, and importation of weed seeds can be significant disturbances in this association and are likely instruments in shaping its composition.
Environmental Description: This association is found on flat to gently sloping riparian sites near permanent or temporary streams below 2015 m (6600 feet) elevation. Sites are usually found on terraces several meters above the active floodplain and below the steeper upland slopes on any aspect. They rarely flood. Soils are usually sandy alluvium and can range from well-drained to poorly drained. The ground surface is largely covered by large rocks, litter, downed wood, or bare soil.
Geographic Range: This association has been sampled in the Colorado Plateau from northwestern Colorado to southwestern Utah and northeastern Arizona; it is likely widespread elsewhere in the southwestern U.S.
Nations: US
States/Provinces: AZ, CO, UT
Plot Analysis Summary:
http://vegbank.org/natureserve/ELEMENT_GLOBAL.2.689436
Confidence Level: Moderate
Confidence Level Comments: No Data Available
Grank: GNA
Greasons: No Data Available
| Type | Name | Database Code | Classification Code |
|---|---|---|---|
| Class | 1 Forest & Woodland Class | C01 | 1 |
| Subclass | 1.B Temperate & Boreal Forest & Woodland Subclass | S15 | 1.B |
| Formation | 1.B.3 Temperate Flooded & Swamp Forest Formation | F026 | 1.B.3 |
| Division | 1.B.3.Nd Western North American Interior Flooded Forest Division | D013 | 1.B.3.Nd |
| Macrogroup | 1.B.3.Nd.90 Interior West Ruderal Flooded & Swamp Forest & Woodland Macrogroup | M298 | 1.B.3.Nd.90 |
| Group | 1.B.3.Nd.90.a Tamarisk species - Russian-olive Ruderal Riparian Forest & Scrub Group | G510 | 1.B.3.Nd.90.a |
| Alliance | A4155 Box-elder - Cottonwood species - Spruce species Ruderal Riparian Forest Alliance | A4155 | 1.B.3.Nd.90.a |
| Association | CEGL002693 Box-elder / Disturbed Understory Riparian Woodland | CEGL002693 | 1.B.3.Nd.90.a |
Concept Lineage: No Data Available
Predecessors: No Data Available
Obsolete Names: No Data Available
Obsolete Parents: No Data Available
Synonomy: = Acer negundo / Disturbed Understory Woodland [Provisional] (Cogan et al. 2004)
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- Western Ecology Working Group of NatureServe. No date. International Ecological Classification Standard: International Vegetation Classification. Terrestrial Vegetation. NatureServe, Boulder, CO.