Comm #12721
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Tsuga heterophylla / Mahonia nervosa / Achlys triphylla Forest
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accession code: VB.CC.23026.TSUGAHETEROPHYL
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Western Ecology Working Group of... |
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This conifer forest association may occur as young- or old-growth. Stands are found at elevations of 610-1370 m (2000-4500 feet) in Oregon. Aspects are usually northern in the southern Cascades and southwest-facing further north. Slopes average 36%. Soils are typically derived from basaltic or andesitic parent material. The dominant overstory species are Pseudotsuga menziesii (56%) and Tsuga heterophylla (28%). The understory tree layer is dominated by Tsuga heterophylla (6%) with no other tree species present in most stands. The shrub layer is characterized by Mahonia nervosa (= var. nervosa) (31%), Acer circinatum (22%), and Rosa gymnocarpa (2%). Important forbs include Achlys triphylla (12%), Viola sempervirens (4%), Anemone deltoidea (2%), and Tiarella trifoliata (6%). |
Comm #12723
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Alnus serrulata - Xanthorhiza simplicissima Shrubland
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accession code: VB.CC.36349.CEGL003895
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Southeastern Ecology Working Gro... |
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This association includes shrublands on rocky or gravelly substrates along narrow river margins in the southeastern Blue Ridge Escarpment gorges, ranging elsewhere on the Southern Blue Ridge and into the Cumberland Plateau. Vegetation composition, density, and height vary with frequency of flooding, substrate, and soil depth. <i>Alnus serrulata</i> and <i>Xanthorhiza simplicissima</i> are common and characteristic but not always dominant. Other shrubs may include <i>Arundinaria gigantea, Diervilla sessilifolia, Salix nigra, Salix sericea, Rhododendron arborescens, Rhododendron viscosum, Rhododendron maximum, Rhododendron periclymenoides, Kalmia latifolia, Leucothoe fontanesiana, Cornus foemina, Cornus amomum, Physocarpus opulifolius, Itea virginica</i>, and <i>Viburnum nudum var. cassinoides</i>. Arborescent species that occur as tall shrubs (or as occasional trees, less than 10% cover) include <i>Acer rubrum, Carpinus caroliniana, Diospyros virginiana, Liquidambar styraciflua, Liriodendron tulipifera, Platanus occidentalis</i>, and <i>Tsuga canadensis</i>. Open areas dominated by grasses and forbs include species such as <i>Agrostis perennans, Boykinia aconitifolia, Carex torta, Eupatorium fistulosum, Lycopus virginicus, Trautvetteria caroliniensis, Houstonia serpyllifolia, Impatiens capensis, Hypericum mutilum, Viola x primulifolia</i>, and <i>Holcus lanatus</i> (exotic). Adjacent alluvial forests in the Blue Ridge are dominated by <i>Tsuga canadensis, Liriodendron tulipifera, Betula lenta</i>, and, at lower elevations, below 610 m (2000 feet), <i>Platanus occidentalis</i> and <i>Liquidambar styraciflua</i>. |
Comm #12729
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Quercus muehlenbergii - Carya spp. / Ostrya virginiana Upper East Gulf Coastal Plain Forest
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accession code: VB.CC.33371.CEGL003903
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Southeastern Ecology Working Gro... |
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This dry-mesic to mesic chinquapin oak - mixed oak-hickory forest association is found in the Upper East Gulf Coastal Plain of Tennessee. It has been documented at Shiloh National Military Park (Hardin County, Tennessee). The canopy is dominated by a mixture of <i>Quercus muehlenbergii, Quercus alba</i>, and <i>Quercus velutina</i>, with <i>Fraxinus americana</i> and <i>Juglans nigra</i> in smaller amounts or in the understory. <i>Carya</i> spp. are prominent in the canopy and subcanopy, including <i>Carya ovata, Carya ovalis, Carya alba</i>, and <i>Carya glabra</i>. All the lower woody strata contain substantial <i>Ostrya virginiana</i>. The one stand sampled is near an ancient (Woodland Period) Native American mound complex very near the Tennessee River. The vegetation could be influenced by shells and shell fragments in the soil. The site could be a former shell midden, but this has not been investigated. |
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