Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park Appendix H. Compositional summary statistics for vegetation associations within Colonial National Historical Park derived from the analysis of regional quantitative plot data. Compositional statistics were calculated to evaluate the adequacy of groups recognized in cluster analysis and ultimately to assist in naming and describing vegetation associations. Only associations derived from quantitative analysis of the regional plot data are shown. Total mean cover and total frequency were determined for every taxon across the entire dataset. Compositional statistics are shown only for prevalent species in each vegetation association, except for those associations where mean species richness is less than or equal to 10 species. Prevalence is an attribute assigned to a portion of the species within a vegetation type (Curtis 1959). Prevalence is determined by ranking the species of a vegetation type in order of descending constancy then, beginning with the most constant species, selecting as prevalent, a number of species equal to the mean species richness for the vegetation type. Species shaded in green were chosen as primary nominals in the association name, while those in blue are parenthetical nominals. See Methods - Vegetation Classification and Characterization - Summary Statistics section for an explanation of variables shown in each table. Vegetation associations are presented as follows: Acidic Oak - Hickory Forest .......................................................................................................... Table H5 Coastal Plain / Piedmont Floodplain Swamp Forest (Green Ash - Red Maple Type) ..................................................................................................................................... Table H10 Coastal Plain / Piedmont Small-Stream Floodplain Forest ............................................................ Table H9 Coastal Plain Calcareous Seepage Swamp .................................................................................... Table H8 Coastal Plain Depression Wetland (Red Maple - Sweetgum - Willow Oak Type) ..................... Table H11 Coastal Plain Depression Wetland (Swamp Tupelo Type) .......................................................... Table H12 Coastal Plain Dry Calcareous Forest ............................................................................................. Table H7 Coastal Plain Loblolly Pine - Oak Forest ....................................................................................... Table H2 Coastal Plain Mesic Calcareous Ravine Forest .............................................................................. Table H6 Mesic Mixed Hardwood Forest ...................................................................................................... Table H3 Non-Riverine Saturated Forest .................................................................................................... Table H13 Piedmont / Coastal Plain Oak - Beech / Heath Forest ................................................................... Table H4 Piedmont / Low Elevation Mixed Oak / Heath Forest ................................................................... Table H1 Salt Scrub ..................................................................................................................................... Table H22 Tidal Bald Cypress Forest / Woodland ........................................................................................ Table H24 Tidal Freshwater Marsh Table H14 Tidal Mesohaline and Polyhaline Marsh (Low Salt Marsh) ........................................................ Table H15 Tidal Mesohaline and Polyhaline Marsh (Transitional Marsh) ................................................... Table H16 Tidal Oligohaline Marsh (Big Cordgrass Type) .......................................................................... Table H19 Tidal Oligohaline Marsh (Common Reed Tidal Marsh) .............................................................. Table H17 Tidal Oligohaline Marsh (Interior Depression Marsh) ................................................................ Table H18 Tidal Oligohaline Marsh (Mixed Forbs Type) ............................................................................. Table H20 Tidal Oligohaline Marsh (Saltmeadow Cordgrass - Olney Three-Square Low Interior Marsh Type) ............................................................................................................. Table H21 Tidal Shrub Swamp (Wax Myrtle Type) ..................................................................................... Table H23 152
USGS-NPS Vegetation Mapping Program Colonial National Historical Park Table H1. Compositional summary statistics from the regional analysis of Piedmont / Low Elevation Mixed Oak / Heath Forest (CEGL008521). Mean Species Richness 25 Homoteneity 0.663 Number of Plots 75 ve TOTAL TOTAL MEAN SPECIES FREQ COVER Nyssa sylvatica 810 5 6 + 99 9 9 6 18 Vaccinium pallidum 528 4 6 ++ 97 14 13 9 53 Acer rubrum 1090 6 6 0 97 7 6 4 6 Quercus alba 721 6 7 + 93 10 9 7 18 Gaylussacia baccata 225 4 7 +++ 89 29 26 20 209 Sassafras albidum 521 3 4 + 85 12 10 5 21 Vaccinium stamineum 373 2 5 +++ 82 16 13 7 108 Quercus velutina 429 4 5 + 82 14 12 7 23 Chimaphila maculata 412 2 2 0 74 13 10 2 10 Quercus coccinea 212 4 6 ++ 70 25 17 11 69 Quercus prinus 396 5 7 ++ 69 13 9 7 36 Smilax glauca 528 2 2 0 66 9 6 1 6 Amelanchier arborea 388 2 4 ++ 61 12 7 3 28 Pinus virginiana 182 2 4 ++ 59 24 14 6 57 Carya glabra 437 4 4 0 58 10 6 3 6 Smilax rotundifolia 798 3 2 - 54 5 3 1 1 Carya alba 411 4 4 0 50 9 5 2 5 Prunus serotina var. serotina 620 2 2 0 50 6 3 1 3 Ilex opaca var. opaca 576 4 4 0 47 6 3 1 3 Fagus grandifolia 631 6 4 - - 47 6 3 1 1 Rhododendron periclymenoides 275 2 3 + 46 12 6 2 11 Cornus florida 627 4 3 - 46 5 2 1 1 Diospyros virginiana 293 2 2 0 46 12 5 1 5 Quercus falcata 178 3 4 + 45 19 8 4 17 Kalmia latifolia 281 4 4 0 42 11 5 2 5 Mean Cover Relati Cover Constancy Fidelity Diagnostic Value Adj DV (scaled) Adj DV (unscaled) 153
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