Vegetation Classification and Mapping Project Report - USGS
Vegetation Classification and Mapping Project Report - USGS
Vegetation Classification and Mapping Project Report - USGS
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<strong>USGS</strong>-NPS <strong>Vegetation</strong> <strong>Mapping</strong> Program<br />
Colonial National Historical Park<br />
examples, only one or the other dominates the canopy. However, in many examples, both are<br />
equally dominant. Common species in the canopy <strong>and</strong> understory include Ilex opaca var. opaca<br />
(American holly), Aesculus sylvatica (painted buckeye), Carpinus caroliniana ssp. caroliniana<br />
(American hornbeam), Cornus florida (flowering dogwood), Fagus gr<strong>and</strong>ifolia (American<br />
beech), Juglans nigra (black walnut), Morus rubra var. rubra (red mulberry), Ostrya virginiana<br />
var. virginiana (hophornbeam), Oxydendrum arboreum (sourwood), Pinus echinata (shortleaf<br />
pine), Prunus serotina var. serotina (black cherry), Quercus alba (white oak), Quercus rubra<br />
var. rubra (northern red oak), Ulmus rubra (slippery elm), Ulmus americana (American elm),<br />
Ulmus alata (winged elm), Juniperus virginiana var. virginiana (eastern redcedar), Nyssa<br />
sylvatica (blackgum), Fraxinus americana (white ash), Halesia tetraptera var. tetraptera<br />
(mountain silverbell), Arundinaria gigantea ssp. gigantea (giant cane), Cornus florida<br />
(flowering dogwood), Platanus occidentalis (American sycamore), Betula nigra (river birch),<br />
<strong>and</strong> Fraxinus pennsylvanica (green ash). Euonymus americanus (strawberry bush), Lindera<br />
benzoin var. benzoin (northern spicebush), <strong>and</strong> Corylus americana (American hazelnut) are<br />
common <strong>and</strong> dominant in the shrub layer. The herbaceous layer is species-rich <strong>and</strong> often has<br />
good sedge development. The exotics Microstegium vimineum (Nepalese browntop), Ligustrum<br />
sinense (Chinese privet), <strong>and</strong> Lonicera japonica (Japanese honeysuckle) are common in this<br />
community.<br />
Environmental Description: These forests develop along small streams. Soils are relatively<br />
acidic <strong>and</strong> relatively well-drained. Topographic differences from one floodplain to another, such<br />
as gradient <strong>and</strong> height above the creek, as well as floodplain microtopography (i.e., depositional<br />
l<strong>and</strong>forms such as natural levees <strong>and</strong> sloughs) may influence the variation of vegetation within<br />
this association. However, in most floodplains supporting this type, the distinct alluvial<br />
l<strong>and</strong>forms are poorly developed or occur at very small scales.<br />
<strong>Vegetation</strong> Description: The canopy, subcanopy, shrub, <strong>and</strong> herbaceous layers of st<strong>and</strong>s of this<br />
association are often well-developed. Dominant canopy species always include Liquidambar<br />
styraciflua (sweetgum) <strong>and</strong> Liriodendron tulipifera (tuliptree), while Acer barbatum (southern<br />
sugar maple) (in the southern part of the range) <strong>and</strong> Acer rubrum var. rubrum (red maple) may<br />
also make up significant amounts of the canopy. This community type exists as a continuum<br />
between two subtypes, i.e., the tuliptree subtype <strong>and</strong> the sweetgum subtype. In some examples,<br />
only one or the other dominates the canopy. However, in many examples, both are equally<br />
dominant. Other common species in the canopy <strong>and</strong> understory include Ilex opaca var. opaca<br />
(American holly), Aesculus sylvatica (painted buckeye), Carpinus caroliniana ssp. caroliniana<br />
(American hornbeam), Cornus florida (flowering dogwood), Fagus gr<strong>and</strong>ifolia (American<br />
beech), Juglans nigra (black walnut), Morus rubra var. rubra (red mulberry), Ostrya virginiana<br />
var. virginiana (hophornbeam), Oxydendrum arboreum (sourwood), Pinus echinata (shortleaf<br />
pine), Prunus serotina var. serotina (black cherry), Quercus alba (white oak), Quercus rubra<br />
var. rubra (northern red oak), Ulmus rubra (slippery elm), Ulmus americana (American elm),<br />
Ulmus alata (winged elm), Juniperus virginiana var. virginiana (eastern redcedar), Nyssa<br />
sylvatica (blackgum), Fraxinus americana (white ash), Halesia tetraptera var. tetraptera<br />
(mountain silverbell), Arundinaria gigantea ssp. gigantea (giant cane), <strong>and</strong> Fraxinus<br />
pennsylvanica (green ash). Scattered individuals of Platanus occidentalis (American sycamore)<br />
<strong>and</strong> Betula nigra (river birch) may also occur in some st<strong>and</strong>s. Euonymus americanus (strawberry<br />
bush), Lindera benzoin var. benzoin (northern spicebush), <strong>and</strong> Corylus americana (American<br />
hazelnut) are common <strong>and</strong> dominant in the shrub layer. Other shrub species that may be present<br />
include Viburnum acerifolium (mapleleaf viburnum), Viburnum nudum var. nudum<br />
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