Releve Virginia Division of Natural Heritage, see http://www.dcr.virginia.gov/natural_heritage/documents/nh_plotform_instructions.pdf
Overall Taxon Cover Values are Automatically Calculated?
no
Plot Quality Fields:
Plot Validation Level
(2) classification plot: sufficient for inclusion in a classification revision
Overall Plot Vegetation Fields:
--no data--
Misc Fields:
Observation Narrative
Plot Location: ca. 0.1 miles S. of Interior Ditch at a point 0.4 miles W of Lake Drummond. Great Dismal Swamp NWR.
Hummock and hollow microtopography.
Nutrient Regime: Eutrophic.
The plot represents vegetation found over substantial area on both side of Railroad Ditch west of Lake Drummond. Although in some ways typical of the secondary, seasonally flooded forests of the Great Dismal Swamp, these communities are unusual in their abundance of Liriodendron tulipifera, Asimina triloba, and the more typically montane ferns Dryopteris internedia and D. carthusiana. Many of the canopy trees (mostly Acer rubrum, Nyssa biflora, and Liriodendron, with a few scattered Taxodium distichum) are large and apparently quite old (>100 years). In places, massive tangles of Smilax rotundifolia cover the crowns of canopy trees and smother large expanses of shrub layer vegetation. In addition to the current prominence of mesic-site species such as Asimina and Dryopteris spp., the habitat has a number of peculiar features which all suggest large-scale hydrologic changes leading to peat dessication and decomposition. Most trees are more of less elevated on large root hummocks; Taxodium knees abound in places where no trees occur, and well preserved, Chamaecyparis thyoideslogs are half-buried in the humus.
0-2cm - litter
2-3cm - duff
3-27cm - dark blackish-brown organic humus, SBK, very firm, dry and powdery w/charcoal
27-50cm - moist peat (=H9)w/charcoal ca. 0.5 cm diam.
50-70cm - dark brown, less decomposed, almost dry crumbly peat
70-80cm - crumbly dry peat (=H7)
80-100cm - similar (=H8) w/ more charcoal
100-120cm - wet peat (=H8) WATER TABLE AT 100cm.
Disturbance Data:
Disturbance Type
Disturbance Intensity
Disturbance Comment
unknown
Logged long ago. Taxodium stumps & knees present. Charcoal abundant in substrate.