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Name
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Reference
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Description |
Comm #6401
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Populus deltoides ssp. wislizeni / Salix irrorata Forest
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accession code: VB.CC.32066.CEGL005993
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Western Ecology Working Group of... |
0
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This lower-montane riparian association is known from small tributaries of the Rio Grande in northern New Mexico. Also, within Bandelier National Monument, this association occurs along a canyon bottom with low solar exposure. It occurs on narrow valley bottom alluvial sediments with low to moderate gradients. Flooding is estimated to occur on a 10-year return interval or less. Elevations range from 1525 to 1900 m (5000-6250 feet). Stands occur on alluvial terraces and bars adjacent to perennial stream channels with gradients less than 10%. The substrates are alluvial deposits derived from basalt and andesite volcanics. The ground surface is characterized by shrubs rooted among rhizomatous grasses, exposed gravels and soil-intermixed litter patches. Stands are dominated by <i>Populus deltoides ssp. wislizeni</i> with moderately open canopies along with scattered <i>Acer negundo, </i><i>Juniperus monosperma</i>, and <i>Juniperus scopulorum</i>. The undergrowth is characterized by thickets of <i>Salix irrorata</i> and a diverse complement of grasses and forbs. As a keystone species, the reproduction of <i>Populus deltoides</i> after flooding (and sufficient subsequent base flows) is critical to the sustainability of this community. |
Comm #6402
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Pinus strobus - Betula populifolia / Comptonia peregrina / Schizachyrium scoparium Woodland
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accession code: VB.CC.31302.CEGL006004
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Eastern Ecology Working Group of... |
0
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This dry sandy riverbluff community occurs on the Merrimack and Soucook rivers in New Hampshire, and may occur elsewhere in New England. The steeply sloping bluffs of glacial sand deposits derived from glacial Lake Merrimack are kept open by the erosion of the base of the bluff by the river flow. The physiognomy of this community is variable, but on average is an open tree canopy characterized by one or more of the following trees: <i>Betula populifolia, Pinus strobus, Populus tremuloides</i>, and <i>Betula papyrifera</i>. <i>Comptonia peregrina</i> is typically present in the sparsely distributed shrub layer, and <i>Quercus ilicifolia</i> may also occur. The herbaceous layer is dominated by <i>Schizachyrium scoparium, Polygonella articulata, Lechea</i> spp., and <i>Lespedeza capitata</i>. <i>Hudsonia ericoides</i> and <i>Lupinus perennis</i>, although not present in all occurrences, are particularly characteristic. |
Comm #6403
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Deschampsia caespitosa - Danthonia californica Coastal Herbaceous Vegetation
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accession code: VB.CC.19316.DESCHAMPSIACAES
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Western Ecology Working Group of... |
0
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Comm #6404
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Populus balsamifera ssp. trichocarpa / Betula papyrifera Forest
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accession code: VB.CC.31162.CEGL000670
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Western Ecology Working Group of... |
0
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Comm #6405
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Populus balsamifera ssp. trichocarpa / Cornus sericea Forest
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accession code: VB.CC.32883.CEGL000672
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Western Ecology Working Group of... |
0
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This association has been documented from Washington south to northern California and eastward to Idaho and Montana west of the Continental Divide, as well as central Montana. It occurs over a broad elevation range of 610 to 2135 m (2000-7000 feet) where <i>Populus balsamifera ssp. trichocarpa</i> is the dominant cottonwood at elevations considered relatively low to mid gradient. This forest type occupies alluvial terraces of major rivers and streams, point bars, side bars, mid-channel bars, delta bars, an occasional lake or pond margin, and even creeps onto footslopes and lower subirrigated slopes of hilly or mountainous terrain. Stands occasionally occur on upper positions of moderate to steep toeslopes and colluvial fans at the base of avalanche chutes. Many of these sites are flooded in the spring and dry deeply by summer's end; capillary action keeps upper portions of the soil profile moist. Other sites are merely subirrigated. <i>Populus balsamifera ssp. trichocarpa</i> dominates the overstory with average cover values ranging from approximately 30-90%. <i>Populus angustifolia, Populus tremuloides, Betula papyrifera</i>, and <i>Salix amygdaloides</i> are common subordinates. Several conifer species can be present with low cover (2-10%) in the upper canopy or as young saplings and are never consistently present. Conifers include <i>Tsuga heterophylla, Pseudotsuga menziesii, Abies lasiocarpa</i>, and <i>Picea engelmannii</i>. The shrub layer comprises at least 25% cover, with <i>Cornus sericea</i> diagnostic for the type and having anywhere from 1-90% cover; other shrub taxa with high constancy include <i>Symphoricarpos</i> spp., <i>Rosa</i> spp., <i>Salix</i> spp., <i>Crataegus</i> spp., <i>Amelanchier alnifolia, Salix lutea, Acer glabrum</i>, and <i>Alnus incana</i>. There are no graminoids exhibiting high constancy, though any one of a number of disturbance-associated exotics can manifest high coverages. Native grasses such as <i>Calamagrostis canadensis, Glyceria striata</i>, and <i>Deschampsia caespitosa</i> can be abundant in undisturbed stands, but this is increasingly less common. <i>Maianthemum stellatum, Galium triflorum, Solidago canadensis</i>, and <i>Equisetum</i> spp. are the only forbs that exhibit even relatively high constancy across the range of the type. |
Comm #6406
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Pinus rigida / Quercus ilicifolia / Lespedeza capitata Woodland
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accession code: VB.CC.31268.CEGL006025
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Eastern Ecology Working Group of... |
0
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This pitch pine - scrub oak barren community occurs on northeastern sand plains, generally on outwash plains, sand dunes and glacial till. Soils are typically sandy, well-drained and nutrient poor. A local history of fire is essential to the maintenance of the community. An open canopy (30-70%) of <i>Pinus rigida</i> over a variable tall-shrub layer (25-95%) of <i>Quercus ilicifolia</i> or <i>Quercus prinoides</i> forms the characteristic structure of this community. In places the canopy may also contain <i>Populus tremuloides, Prunus serotina, Prunus pensylvanica</i> or <i>Betula populifolia</i>. A short-shrub layer of <i>Vaccinium pallidum, Vaccinium angustifolium, Gaylussacia baccata, Comptonia peregrina</i> and <i>Pteridium aquilinum</i> is usually present. Characteristically, small grassy openings dominated by <i>Schizachyrium scoparium</i>, occur within the woodland matrix. These grassy patches are rich in herbaceous species such as <i>Andropogon gerardii, Sorghastrum nutans, Lespedeza capitata, Polygala nuttallii, Lechea mucronata, Lysimachia quadrifolia, Helianthemum canadense</i> and <i>Lupinus perennis</i>. These patches create important habitat for several rare invertebrates. |
Comm #6407
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CEGL007216
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accession code: VB.CC.7025.CEGL007216
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EcoArt 2002 |
0
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Comm #6408
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CEGL002651
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accession code: VB.CC.5059.CEGL002651
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6409
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CEGL002652
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accession code: VB.CC.5060.CEGL002652
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6410
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CEGL002653
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accession code: VB.CC.5061.CEGL002653
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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