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Vegetation Classification and Mapping Project Report - USGS

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<strong>USGS</strong>-NPS <strong>Vegetation</strong> <strong>Mapping</strong> Program<br />

Colonial National Historical Park<br />

Axis 3<br />

COLO.13<br />

COLO.16<br />

COLO.14<br />

GEWA.6<br />

CaMgRatio<br />

Fertility<br />

pH<br />

COLO.15<br />

COLO.6<br />

GEW A.3<br />

COLO.3<br />

APCO.6<br />

Axis 1<br />

N<br />

OM<br />

APCO.4<br />

COLO.29<br />

BOWA.5<br />

Mg<br />

Boulders<br />

TRMI<br />

Al<br />

BOWA.4<br />

Group<br />

CEGL006186<br />

CEGL007181<br />

CEGL007748<br />

Figure G13. Joint plot showing significant correlations (r 2 = 0.290) of environmental variables with ordination scores for 73 basic<br />

mesic <strong>and</strong> calcareous forest plots on Axis 1 <strong>and</strong> Axis 3 of the NMDS ordination. The angles <strong>and</strong> lengths of the radiating lines indicate<br />

the direction <strong>and</strong> strength of the relationship. Boron <strong>and</strong> Na were also significantly correlated in the same direction as pH <strong>and</strong> Fertility,<br />

but were removed from the graphic for clarity. Environmental variables used in joint plots are listed in Table 5. Plots from the seven<br />

Virginia national parks are labeled to the right of or below the symbol. Only the 73 plots in this group with complete environmental<br />

data were included in the ordination.<br />

134

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