Indirect gradient analysis - Alaska Geobotany Center
Indirect gradient analysis - Alaska Geobotany Center
Indirect gradient analysis - Alaska Geobotany Center
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Geometric determination of plots along the first axis<br />
Dissimilarity matrix:<br />
All the plots are positioned with<br />
respect to reference plots 3<br />
and 9.<br />
For Plot 1, the dissimilarity to<br />
Plot 3, d 1,3<br />
, is 38, and<br />
dissimilarity to Plot 9, d 1,9<br />
, is<br />
67. (See dissimilarity matrix.)<br />
d 1,3 = 38<br />
x 1,3 = 21<br />
d 1,9 = 67<br />
The x coordinate of plot 1 is:<br />
x = (L 2 + (dA) 2 - (dB) 2 )/2L<br />
X 1,3<br />
= (80 2 + 38 2 - 67 2 )/(2(80)) =<br />
(6400 + 1444 + 4489)/160 = 21
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