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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 />

PETE.6<br />

RICH.9<br />

FRSP.2<br />

PETE.3<br />

FRSP.23<br />

K<br />

BOWA.1<br />

Mg<br />

Ca<br />

BOWA.6<br />

RICH.1<br />

FRSP.4<br />

FRSP.1<br />

Axis 1<br />

Fertility<br />

Base Saturation<br />

pH<br />

FRSP.8<br />

COLO.24<br />

BOWA.2<br />

FRSP.21<br />

APCO.13<br />

APCO.10<br />

APCO.1<br />

APCO.9<br />

APCO.2<br />

Group<br />

CEGL007232<br />

CEGL008475<br />

Figure G10. Joint plot showing significant correlations (r 2 = 0.20) of environmental variables<br />

with ordination scores for 98 oak - hickory forest plots on Axis 1 <strong>and</strong> Axis 3 of the NMDS<br />

ordination. 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 or below the symbol.<br />

131

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