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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 2<br />

COLO.11<br />

APCO.11<br />

FRSP.13<br />

CaMgRatio<br />

Ca<br />

B<br />

PETE.2<br />

P<br />

pH<br />

Al<br />

BOWA.3<br />

Zn<br />

Axis 1<br />

Group<br />

CEGL004418<br />

CEGL006217<br />

CEGL006492<br />

Figure G19. Joint plot showing significant correlations (r 2 = 0.20) of environmental variables<br />

with ordination scores for 50 alluvial forest plots on Axis 1 <strong>and</strong> Axis 2 of the NMDS ordination.<br />

The angles <strong>and</strong> lengths of the radiating lines indicate the direction <strong>and</strong> strength of the<br />

relationship. Environmental variables used in joint plots are listed in Table 5. Plots from the<br />

seven Virginia national parks are labeled to the right of the symbol. Only the 50 plots with<br />

complete environmental data were included in the ordination.<br />

140

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