Name:
Pinus contorta / Carex (aquatilis, angustata) Swamp Woodland
Reference:
NatureServe Biotics 2019
Description:
This swamp woodland is found in Oregon. <i>Pinus contorta</i> is the dominant tree. <i>Populus tremuloides, Pinus ponderosa, Abies lowiana</i>, and <i>Abies grandis</i>, if present, are scattered individuals. <i>Salix</i> spp. are present in some wetter stands. The ground cover is dominated by a dense sward of <i>Carex angustata</i> or <i>Carex aquatilis</i>. Common grasses include <i>Calamagrostis canadensis, Deschampsia cespitosa, Juncus arcticus ssp. littoralis, Poa palustris, Poa pratensis, Hordeum brachyantherum, Elymus glaucus, Glyceria striata</i>, and <i>Phleum alpinum</i>. <i>Poa pratensis</i> was present on all stands and will increase in cover with overgrazing or lowering of the water table. The rich forb component includes <i>Achillea millefolium, Geum macrophyllum, Fragaria virginiana, Fragaria vesca, Polemonium occidentale, Platanthera dilatata, Ligusticum grayi, Trifolium longipes, Epilobium ciliatum</i>, and <i>Taraxacum officinale</i>. <i>Salix geyeriana</i> and <i>Spiraea douglasii</i> are present on many stands but are low in cover. This association is strongly associated with deep pumice mantles. It is similar to ~<i>Picea engelmannii / Carex angustata</i> Swamp Forest (CEGL000359)$$ but occurs below the elevational distribution of <i>Picea engelmannii</i>. Elevations are low to moderate. Landforms include forested floodplains along streams, small forested basins, the margins of meadows, and shallow, concave, subirrigated drainages. The microrelief is flat to very slightly undulating to concave. Soils are deep pumice alluvia. This association is abundant in the southeastern East Cascades ecoregion and at moderate to high elevations in the central Blue Mountains ecoregion of Oregon. It is found in landforms supporting active floodplains, shores of lakes and ponds, and forested basins. Microtopography is flat, smooth to slightly undulating, or slightly concave. Valleys are flat, low- to moderate-gradient and moderately wide to wide. Surface textures range from sandy loam to silt loam. One plot had a thin layer of sedge peat on top of a sandy loam subsurface soil at the edge of a pond. Available water-holding capacity is moderate to high. The water table is near to slightly above the soil surface in June and is within 60 cm of the surface in August and September.
Accession Code:
urn:lsid:vegbank.org:commConcept:29049-{B1E344FB-5C4B-4CCD-AFB6-271D91F9ED36}
Plot-observations of this Community Concept:
0
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