Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park Appendix F. Environmental variable averages for associations derived from the analysis of regional quantitative plot data. Mean values for selected continuous and ordinal environmental variables were calculated for the 35 associations occurring in seven national parks in Virginia that were derived from the analysis of quantitative plot data. Calculations were performed with raw (untransformed) values by taking the average across all plots representing a given association. Environmental variables were only summarized if at least half the plots in a given association contained data; otherwise the table cells are shaded. Mean aspect was calculated as the average position along an arc defined by the range of aspect values. Topographic variables and percentage substrate are presented in a separate table from soil chemistry variables. Column headings are as follows: Topographic variables Aspect Slope Inclination (see Table 4) Topographic Position (see Table 4) TRMI = Topographic Relative Moisture Index Percentage substrate %Bedrock = percentage cover by bedrock in plot %Large Rocks = percentage cover by boulders and stones (rocks > 10 cm) in plot %Small Rocks = percentage cover by gravel and cobble (rocks 0.2–10 cm) in plot %Min. Soil = percentage cover by bare sand or mineral soil in plot %Litter&Duff = percentage cover by leaf litter and duff in plot %Wood = percentage cover by dead wood in plot %Water = percentage cover by water in plot %NonVasc = percentage cover by nonvascular plants in plot Soil chemistry variables are as defined in Table 5. Associations present in Colonial National Historical Park are listed in bold font. 116
USGS-NPS Vegetation Mapping Program Colonial National Historical Park Table F1. Environmental variable averages by association – topographic variables and percentage substrate. USNVC Code Aspect Oak / Heath Forests Coastal Plain Mixed Oak / Heath Forest CEGL006269 flat to SW Slope Inclination Toporaphic Position TRMI %Bedrock %Large Rocks %Small Rocks %Min. Soil %Litter & Duff %Wood %Water %NonVasc gentle to moderate lower to middle slope 26.7 0 0 0 6 91 3 0 1 Piedmont / Low Elevation Mixed Oak / Heath Forest CEGL008521 S gentle upper slope 24.6 0 0 1 1 94 4 0 0 Pine - Oak Forests Coastal Plain Loblolly Pine - Oak Forest CEGL004766 flat level to gentle plain/level/bottom - lower slope 31.5 0 0 0 1 96 4 0 1 Eastern White Pine - Hardwood Forest Mesic Acidic Forests CEGL008539 NNW moderate to steep middle slope 25.9
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Vegetation Classification and Mapping Project Report - USGS

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