In the example you described there would be great differences below ground. One would expect significant competition for nutrients and moisture in situation A that would not be experienced in situation B. On Tue, 1 Nov 1994, Mike Sonntag wrote: > Hallo, > > developing an individuum-based model of mixed species forests I came > over a problem I would like to share with you: > > How does a suppressed tree know that it is suppressed? > > Consider the following (hypothetical) situation: You have two > indentical clones of, lets say, spruce. The first (A) you plant on a site > in e.g. montane Germany under an existing canopy. The > other (B) you plant e.g. in Finland on an open field. The sites are such > that the amount of radiation, climate (temperature, precipitation) > and soil are for both clones identical. So if both clones come out they both > experience the same climate, soil etc.. Now both trees should grow in > the same way, but experience tells you that the suppressed spruce A will > grow in a different way than B, meaning A will grow more in height > than B, and less in diameter. > > Question: How does A tell that it is suppressed? What is the > difference in the situation of A and B? > Is it the quality of light that it filtering through the canopy > telling tree A of it suppressed status? or do I overlook something > fundamental? > > The answer is very important for the further development of my > simulation model. > > Any comments and suggestions are highly appreciated, > > yours truely, > > Michael Sonntag > Forschungsgruppe Umweltsystemanalyse > University of Kassel > Moenchebergstr. 11 > 34109 Kassel > Germany > Tel.: 0561 804 31 75 > Fax: 0561 804 31 76 > Mail: michael@usys.informatik.uni-kassel.de >
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