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Description |
Comm #6821
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Sporobolus neglectus - Sporobolus vaginiflorus - Isanthus brachiatus - Panicum philadelphicum - (Poa compressa) Alvar Herbaceous Vegetation
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accession code: VB.CC.36630.CEGL005235
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Midwestern Ecology Working Group... |
0
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Annual alvar pavement-grasslands occur in Ontario and New York in the central and eastern Great Lakes region on shallow soils (usually less than 10 cm deep) over flat limestone and dolostone outcrops (pavements). At some sites there is a distinctive soil moisture regime of alternating wet and dry seasons; they are often saturated in early spring and late fall, and they are subject to severe summer drought in most years (except unusually wet years). Due to the very shallow soils, and often saturated conditions during freeze-thaw cycles in early and late winter, needle ice often forms in the soils, causing frost-heaving of the shallow soils. This community typically occurs in a landscape mosaic with other alvar communities; the most common associated communities are tufted hairgrass wet alvar grassland, juniper alvar shrubland, alvar nonvascular pavement, little bluestem alvar grassland, and poverty grass dry alvar grassland. This community consists of a mosaic of pavement and grassland areas dominated by characteristic native species, such as <i>Sporobolus neglectus, Sporobolus vaginiflorus, Panicum philadelphicum, Poa compressa, Oligoneuron album (= Solidago ptarmicoides), Danthonia spicata, Isanthus brachiatus (= Trichostema brachiatum), Packera paupercula (= Senecio pauperculus), Carex crawei</i>, and <i>Panicum flexile</i>. There is usually less than 10% cover of shrubs. There may be nearly equal cover of grassy vegetation, and exposed rock covered with nonvascular plants. Lichens and mosses are common on 'pavement' rock outcrops that occur as patches within this mosaic. |
Comm #6822
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CEGL008317
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accession code: VB.CC.7658.CEGL008317
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EcoArt 2002 |
0
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Comm #6823
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CEGL000861
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accession code: VB.CC.3465.CEGL000861
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6824
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Betula nana / Mesic Forbs - Mesic Graminoids Shrubland
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accession code: VB.CC.17998.BETULANANAMESIC
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Western Ecology Working Group of... |
0
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Most stands of this association occur in subalpine meadows and willow communities. It grows in areas where soils are saturated from snowmelt runoff for a significant part of the growing season, often on fens or bogs, where the vegetation receives water from seeps and springs. Elevational range is 2600-3000 m (8500-10,000 feet). Betula nana dominates the canopy with 20-80% cover. Due to their small size, Betula nana patches often intergrade with surrounding communities. Other shrubs present include 0-20% cover each of Salix planifolia, Salix monticola, Salix wolfii, and Dasiphora fruticosa ssp. floribunda (= Pentaphylloides floribunda) and 0-10% cover each of Salix brachycarpa and Lonicera involucrata. The herbaceous undergrowth grows on small hummocks and is usually dominated by a dense mixture of mesic forbs and mesic graminoids. Mesic graminoids include 0-30% cover of Calamagrostis canadensis, 0-10% cover each of Carex aquatilis, Carex utriculata, and Deschampsia caespitosa, and 0-5% cover of Carex norvegica. Forb species include 0-10% cover each of Chamerion angustifolium (= Epilobium angustifolium), Caltha leptosepala, Ligusticum filicinum, Angelica pinnata, Mertensia ciliata, and Thalictrum alpinum, and 0-5% cover of Conioselinum scopulorum. |
Comm #6825
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Boreal Glaciere Talus Sparse Vegetation
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accession code: VB.CC.37091.CEGL005243
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Midwestern Ecology Working Group... |
0
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This boreal talus community is found in the upper midwestern United States and in adjacent Canada in northern Ontario. Stands contain quartzite or other metamorphic or igneous rock talus slope or 'felsenmeer' communities that are characterized by all-summer upwellings of cool, moist air near or at their bases. Glaciere talus forms as the result of periglacial frost and ice-wedging. Quartzite, in particular, is a brittle rock that is susceptible to frost-wedging. The talus slopes themselves consist of lichen-covered boulders ranging from 0.25-1 m in diameter. Nearly all sites occur in areas that were glaciated during the Pleistocene. The vegetation is physiognomically complex, tending to be shrubby with scattered trees and patches of ferns, mosses, and lichens. At the Wisconsin sites, there may occur scattered soil pockets that support scattered pines (<i>Pinus strobus</i> and <i>Pinus resinosa</i>). These are often associated with mossy beds of <i>Polypodium virginianum</i>. At the base of the talus slope, cold air upwells during the summer among the jumbled boulders along a narrow (3-20 m wide) front. Here, among the talus blocks, shrublands typically occur, dominated by <i>Acer spicatum, Ribes glandulosum</i>, and <i>Cornus rugosa</i>, under which is a dense carpet of ferns (mostly <i>Polypodium virginianum</i>) and rare and disjunct mosses and lichens. Scattered trees of <i>Betula papyrifera, Acer saccharum, Acer rubrum</i>, and <i>Abies balsamea</i> may be present. Rare plants present may include species disjunct from slightly to much farther north, such as <i>Viburnum edule, Ribes oxyacanthoides, Clematis occidentalis, Ledum groenlandicum</i>, and <i>Abies balsamea</i>. In general, this community type has been incompletely surveyed and occurrences should be carefully inspected for rare bryophytes, lichens, and terrestrial snails. <br><br>In Ontario (Ouimet Canyon and Cavern Lake), slow-melting ice is present throughout the summer among the talus blocks and arctic disjunct plants, such as <i>Arenaria humifusa, Pyrola grandiflora, Carex atratiformis, Arnica lonchophylla ssp. lonchophylla (= Arnica chionopappa), Salix myrtillifolia, Saxifraga paniculata</i>, and <i>Polygonum viviparum</i>, occur. The moss <i>Aulacomnium acuminatum</i> is dominant and may comprise 90% of the ground cover. Scattered 'layering' of small trees of <i>Picea mariana</i> and <i>Betula papyrifera</i> may occur in the cold upwelling zone, and <i>Ledum groenlandicum</i> is locally frequent. |
Comm #6826
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Betula alleghaniensis - (Acer saccharum, Picea glauca) Forest
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accession code: VB.CC.37094.CEGL005245
NOT CURRENTLY ACCEPTED
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Midwestern Ecology Working Group... |
0
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This yellow birch forest type is provisionally reported from Isle Royale, Michigan, but its rangewide status is still unclear. It may extend to the east, until <i>Picea rubens</i> enters into the range. At Isle Royale National Park, this community occupies gentle to steep slopes at elevations from 190-240 m (630-780 feet). Soils are moderately well-drained to rapidly drained sandy loams. The vegetation forms a closed-canopy, deciduous forest. Canopy cover is usually about 70-80% cover (sometimes less); the most abundant trees are <i>Betula alleghaniensis, Picea glauca</i> and <i>Betula papyrifera</i>. There is often a subcanopy with 5-30% cover (same species as in the canopy). Cover of tall shrubs is about 5-10% cover; the most abundant tall shrubs are saplings of <i>Picea glauca</i> and <i>Abies balsamea</i>, and <i>Sambucus racemosa</i>. Cover of short shrubs varies from 10-70% cover; the most abundant short shrubs are <i>Rubus parviflorus, Sorbus decora, Diervilla lonicera, Lonicera canadensis</i>, and <i>Rubus idaeus</i>. There is a sparse cover of dwarf-shrubs, mainly <i>Rubus pubescens</i>. Cover of herbs varies from 40-80% cover; the most abundant herbs are <i>Aralia nudicaulis, Cornus canadensis, Clintonia borealis, Lycopodium annotinum, Streptopus lanceolatus var. roseus, Athyrium filix-femina</i>, and <i>Oxalis montana</i>. Cover of nonvascular plants is sparse (0-10% cover); <i>Pleurozium schreberi</i> is characteristic. |
Comm #6827
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Populus tremuloides / Alnus incana - Salix spp. Forest
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accession code: VB.CC.22756.POPULUSTREMULOI
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Western Ecology Working Group of... |
0
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Comm #6828
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CEGL000875
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accession code: VB.CC.3479.CEGL000875
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6829
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CEGL000876
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accession code: VB.CC.3480.CEGL000876
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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Comm #6830
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CEGL000025
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accession code: VB.CC.2653.CEGL000025
NOT CURRENTLY ACCEPTED
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EcoArt 2002 |
0
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