Questioning a traditional method of growth analysis

• To: forest@ftp.funet.fi
• Subject: Questioning a traditional method of growth analysis
• From: dsouth@forestry.auburn.edu (David South)
• Date: Wed, 22 Dec 1993 19:51:33 +0200

Many forest researchers use mean relative growth rates as a method of
growth analysis.  I contend that this is not a valid technique since in most
cases, the MRGR is a function of tree size.  Usually the MRGR declines as
seedling size increases.  Therefore, using this technique does not "eliminate
differences in growth rates due to seedling size."


I solicit replies from anyone who still believes that comparing
mean relative growth rates is a valid technique for comparing growth of
seedlings that differ in initial size.


In particular, I am looking for anyone who can demonstrate that

(1) MRGR is independent of seedling size.

or

(2) When MRGR is a function of seedling size, any valid explanation 
    for why this method of growth analysis should be used when comparing
    growth response to various treatments.  


I do not accept "tradition" as a valid scientific justification for using
this method of growth analysis.
David South                          FAX: 205-844-1084
School of Forestry                   Telephone: 205-844-1022
Auburn University, AL 36849-5418     Email:  dsouth@forestry.auburn.edu
USA

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