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Fraxinus pennsylvanica - Ulmus americana - Populus deltoides Floodplain Forest Alliance | NatureServe Biotics 2019
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Name: Fraxinus pennsylvanica - Ulmus americana - Populus deltoides Floodplain Forest Alliance Reference: NatureServe Biotics 2019 Description: These floodplain woodlands and forests are found in the northern Great Plains. They have a medium-tall to tall (8-20 m) tree canopy which ranges from open to closed (25-60+%). A tree subcanopy may be present. A deciduous shrub layer is common and can be dense, especially under more open tree canopies. Most shrubs range from 1-3 m tall. The herbaceous stratum is typically moderate to dense, though shading by dense tree or shrub canopies can limit the growth of this stratum. <i>Fraxinus pennsylvanica</i> is usually the dominant tree and is nearly always present in stands. <i>Acer negundo, Tilia americana</i>, and <i>Ulmus americana</i> are commonly present and can be dominant or codominant. Remnant <i>Populus deltoides</i> from earlier successional forest stages may be present, usually significantly taller than the main canopy layer. When a tree subcanopy is present it is composed of canopy species, tall shrubs of <i>Amelanchier alnifolia, Cornus</i> spp., <i>Juniperus scopulorum</i>, and <i>Prunus virginiana</i>. Shorter shrubs, particularly <i>Symphoricarpos occidentalis</i>, are present to abundant. Graminoids include <i>Elymus canadensis, Elymus virginicus, Leersia</i> spp., <i>Muhlenbergia racemosa</i>, and <i>Poa pratensis</i>. Many forbs can be present but common ones are <i>Rudbeckia laciniata, Galium</i> spp., and <i>Viola</i> spp. This alliance occurs on floodplains or terraces and sometimes along lakes or ponds on sites that are flooded periodically but are not subject to frequent scouring or deposition from flood events. Soils are alluvium and deep and usually silty.  Accession Code: urn:lsid:vegbank.org:commConcept:39340-{BBC0E4C9-2F8F-4D7A-9520-4CCEB60EB0E8} Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 18-Dec-2014 to: ongoing
	status: accepted Community's Parent: Populus deltoides - Fraxinus pennsylvanica / Pascopyrum smithii Floodplain Forest Group This Community's Level: Alliance This Community's Children: Show/Hide   Acer negundo / Prunus virginiana Floodplain Forest   Fraxinus pennsylvanica - Ulmus americana - (Acer negundo, Tilia americana) Great Plains Floodplain Forest   Fraxinus pennsylvanica - (Ulmus americana) / Symphoricarpos occidentalis Floodplain Forest		Names:   UID: ELEMENT_GLOBAL.2.934751 NatureServe Explorer   Code: A4131   Translated: Green Ash - American Elm - Eastern Cottonwood Floodplain Forest Alliance   Common: Great Plains Ash - Elm Floodplain Forest   Scientific: Fraxinus pennsylvanica - Ulmus americana - Populus deltoides Floodplain Forest Alliance