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Sporobolus neglectus - Sporobolus vaginiflorus - Isanthus brachiatus - Panicum philadelphicum - (Poa compressa) Alvar Herbaceous Vegetation | Midwestern Ecology Working Group...
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Name: Sporobolus neglectus - Sporobolus vaginiflorus - Isanthus brachiatus - Panicum philadelphicum - (Poa compressa) Alvar Herbaceous Vegetation Reference: Midwestern Ecology Working Group... Description: 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.  Accession Code: VB.CC.36630.CEGL005235 Plot-observations of this Community Concept: 0
	Party Perspective according to: NatureServe (organization) Perspective from: 17-Nov-2014 to: 01-May-2019
	status: accepted This Community's Level: association This Community's Children: [none]		Names:   Translated: Barrens Dropseed - Poverty Dropseed - Fluxweed - Philadelphia Panicgrass - (Canada Bluegrass) Alvar Herbaceous Vegetation   Scientific: Sporobolus neglectus - Sporobolus vaginiflorus - Isanthus brachiatus - Panicum philadelphicum - (Poa compressa) Alvar Herbaceous Vegetation   Code: CEGL005235   Common: Annual Alvar Pavement Grassland   UID: ELEMENT_GLOBAL.2.686394 NatureServe Explorer