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Question of interest:

Does fertilization with nitroget homogenize communities and are effects consistent across environmental gradients?
control/+N

Use pairwise experiment-within blocks

calculate dissimilarity (e.g. Euclidean distance)
D1 = C1 compared to N1
D2 = C2 compared to N2
calculate variability in D1:n

Dissimilarity between blocks:

Dc = dissimilarity among control plots
Dn = dissimilarity among treated plots
compare Dc to Dn
Dc = Dn (null hypothesis)
Dc >? Dn (alternative hypothesis)
Dobs / Dexpected by chance
(Dc / Dn)obs compared to (Dc / Dn)ebc
plot D against productivity (P)

How to measure dissimilarity?

this is basically beta diversity (B)

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This page last changed on 26-Sep-2005 13:49:31 PDT by LTER.dpennington.

This material is based upon work supported by the National Science Foundation under award 0225676. Any opinions, findings and conclusions or recomendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation (NSF).


Long Term Ecological Research Network, UNM	National Center for Ecological Analysis and Synthesis, UCSB	Biodiversity Research Center, KU	San Diego Supercomputer Center, UCSD


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Copyright 2004 Partnership for Biodiversity Informatics, University of New Mexico, The Regents of the University of California, and University of Kansas