Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park association was represented by 21 plots from the northern Coastal Plain of Virginia. The original concept of this vegetation was based on field work by Bill Moorhead (VDNH), who investigated several of the large, elliptical depressions that dot the flat landscape in Accomack County. There are three plots that document this vegetation at two sites: "Dahl Swamp" and "The Lake" (G. Fleming pers. comm.). The stands apparently cover many hectares and are associated with slight depressions with drainage impeded by an impermeable clay layer about half a meter below the soil surface. The habitat apparently has a seasonally high water table but ponds water only intermittently or for short periods. Most of the areas seen by Bill Moorhead had been logged some decades ago and had a very open (woodland-like) physiognomy due to poor restocking of canopy trees. However, he also obtained information from local people that one of the areas was known historically as "savanna land," suggesting that fire and hydrology maintained a woodland physiognomy in the depressions (G. Fleming pers. comm.). Similar Associations: • Carex striata var. brevis Herbaceous Vegetation (CEGL004120). • Liquidambar styraciflua - Acer rubrum - Quercus phellos / Leucothoe racemosa Forest (CEGL006110)--is also found in Ecoregion 58. • Quercus michauxii - Quercus pagoda / Clethra alnifolia - Leucothoe axillaris Forest (CEGL007449)--southern analogue found on mineral soils near the edge of extensive peat flats on the outer Coastal Plain terraces of southeastern Virginia and North Carolina; compositionally very similar to CEGL004644 but contains southern species such as Quercus laurifolia, Leucothoe axillaris, Arundinaria gigantea ssp. tecta, and Sabal minor that are absent from CEGL004644. Related Concepts: • Quercus (michauxii, pagoda, phellos, alba) / Clethra alnifolia / Woodwardia virginica Forest (VDNH 2003) = SOURCES Description Authors: G. P. Fleming, mod. M. Pyne and G. P. Fleming. References: Fleming et al. 2001, Fleming pers. comm., J. Harrison pers. comm., Southeastern Ecology Working Group n.d., VDNH 2003. Figure I17. Non-Riverine Saturated Forest (plot COLO.18) at Colonial National Historical Park. July 2004. NAD 1983 / UTM easting 340914, northing 4124971. 256
USGS-NPS Vegetation Mapping Program Colonial National Historical Park Figure I18. Non-Riverine Saturated Forest (plot COLO.28) at Colonial National Historical Park. May 2005. NAD 1983 / UTM easting 340770, northing 4124926. 257
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Vegetation Classification and Mapping Project Report - USGS

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