Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park Similar Associations: • Lolium (arundinaceum, pratense) Herbaceous Vegetation (CEGL004048). • Phleum pratense - Bromus pubescens - Helenium autumnale Herbaceous Vegetation (CEGL004018). • Schizachyrium scoparium - (Andropogon virginicus) - Solidago spp. Herbaceous Vegetation (CEGL006333)-has a greater component of native species and occurs on drier soils. Related Concepts: Information not available. SOURCES Description Authors: S. C. Gawler. References: Clark 1986, Dowhan and Rozsa 1989, Eastern Ecology Working Group n.d., Edinger et al. 2002, Ehrenfeld 1977, Elliman 2003, Keever 1979, NRCS 2004, Newbold et al. 1988, Perles et al. 2006a, Perles et al. 2006b, Perles et al. 2006c, Perles et al. 2007, Sneddon et al. 1995, TDNH unpubl. Data. Figure I27. Cultural Meadow at Colonial National Historical Park. September 2004. NAD 1983 / UTM easting 364850, northing 4119073. 286
USGS-NPS Vegetation Mapping Program Colonial National Historical Park COMMON NAME (PARK-SPECIFIC): TIDAL OLIGOHALINE MARSH (COMMON REED TIDAL MARSH) SYNONYMS USNVC English Name: Common Reed Tidal Herbaceous Vegetation USNVC Scientific Name: Phragmites australis Tidal Herbaceous Vegetation USNVC Identifier: CEGL004187 LOCAL INFORMATION Environmental Description: This association is a dense, tall grassland indicative of disturbance. It occurs on dredge spoils and other disturbed areas, generally in areas that are regularly flooded with tidal water. Species within and adjacent to this community are typical of oligohaline conditions where salt concentrations are between 0.5 and 5 ppt. Substrates range from muck or peat to sand. Vegetation Description: This vegetation is characterized by dense stands of the invasive, nonnative grass Phragmites australis (common reed), typically to the exclusion of all other vascular plant species. Other species typical of oligohaline marsh may occur with low cover, such as Peltandra virginica (green arrow arum), Typha angustifolia (narrowleaf cattail), Spartina cynosuroides (big cordgrass), and Polygonum punctatum (dotted smartweed). Most Abundant Species: Stratum Lifeform Species Herb (field) Graminoid Phragmites australis (common reed) Characteristic Species: Phragmites australis (common reed). Other Noteworthy Species: Information not available. Subnational Distribution with Crosswalk Data: State SRank Rel Conf SName Reference VA SNR* B 1 Tidal Oligohaline Marsh Fleming et al. 2006 Local Range: Tidal Oligohaline Marsh (Common Reed Tidal Marsh) was noted at College Creek / Kingsmill, Jamestown Island, and in other areas as small patches. It is one of five associations included in the map class Tidal Oligohaline Marsh. The five associations cannot be mapped separately based on photo signatures, and a combined map class was used the vegetation map. Polygons of Tidal Oligohaline Marsh may, in some cases, include several associations. Classification Comments: Tidal Oligohaline Marsh (Common Reed Tidal Marsh) is distinguished by being dominated by Phragmites australis (common reed). Other Comments: Information not available. Local Description Authors: K. D. Patterson. Plots: None. Colonial National Historical Park Inventory Notes: Information not available. GLOBAL INFORMATION USNVC CLASSIFICATION Physiognomic Class Herbaceous Vegetation (V) Physiognomic Subclass Perennial graminoid vegetation (V.A.) Physiognomic Group Temperate or subpolar grassland (V.A.5.) Physiognomic Subgroup Natural/Semi-natural temperate or subpolar grassland (V.A.5.N.) Formation Tidal temperate or subpolar grassland (V.A.5.N.n.) Alliance Phragmites australis Tidal Herbaceous Alliance (A.1477) 287
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