Weird question on phenology

KEVIN SHIELL shiell at
Tue Oct 11 06:44:31 EST 1994

There are a number of reason for the trees turning color.  Temperature is
only a very minor reason (although it may be species specific).  It seems that
light (day length) is probably the biggest driving force although
moisture (rainfall) is a factor.  This can be seen in trees
growing near or surrounded by ashphalt, they will turn color before
other trees with good available moisture.  I hope you get some better
answers than this, a good physiologist might be able to give you a more
detailed explanation of your specific observation.

Kevin Shiell
Grad. Student: NAtive Fruit Development University of Saskatchewan

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