Indirect gradient analysis - Alaska Geobotany Center
Indirect gradient analysis - Alaska Geobotany Center
Indirect gradient analysis - Alaska Geobotany Center
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Relating the ordination to environmental factors:<br />
(3) Correlation of axes x,y coordinates with with environmental data<br />
Kendall s Tau Correlation Coefficients from Anja<br />
Kade s study<br />
Variable<br />
Thaw depth<br />
Soil moisture<br />
Soil pH<br />
Depth of O horizon<br />
Cover of bare soil<br />
Vegetation height<br />
Axis 1<br />
0.39<br />
-0.28<br />
0.53<br />
0.32<br />
0.48<br />
-0.43<br />
Axis 2<br />
-0.47<br />
0.39<br />
-0.36<br />
0.59<br />
-0.33<br />
0.50<br />
• Scores on Axis 1<br />
and Axis 2 were<br />
correlated with<br />
each environmental<br />
variable. This table<br />
shows the highest<br />
correlations for<br />
each axis.<br />
• The highest scores<br />
on the Axis 1<br />
appear to be<br />
related most<br />
strongly to climate<br />
and pH.<br />
Shrub cover<br />
Factors related to<br />
Bioclimate/pH <strong>gradient</strong><br />
-0.63<br />
Factors related to<br />
Disturbance <strong>gradient</strong><br />
0.46<br />
• Scores on Axis 2<br />
are most strongly<br />
related to<br />
cryoturbation and<br />
disturbance.
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