--canopy defoliation, via sapp viscosity changes, from temp variation(fall)--

 an epiphany--

  "sap", or "c+(add vitamin)+h20" flows to the leaf, to be dehydrated from the leaf, by the sun, to separate the molecules in "c+(add vitamin)+h20", to be used in the tree,
or plant--

note--

  when temperatures become too near freezing, the area in between the veins of the leaf( "solar fields"), and the small veins that re-hydrate them, freeze...this prevents re-hydration of the entire leaf, the leaf then dries out, from the suns rays, but is not replenished--


the point--

  due to the leaf being dry( dehydrated), the leaf's connection to the branch, is broken, from wind forces, gravity, and the fact that the stem of the leaf is dry( no water in the stem causes there to
be less "molecular surface tension", and a crack/fissure results), causing the leaf to fall, the change in color is the dehydration process, being expressed visually( from changes in the vibrations, or
"frequency", of the molecules within the leaf's stem), causing different spectrums of the light
rays hitting the leaf, to be "canceled", "deflected", or clipped...resulting in a visual color change, of the leaf, to be observed--

best wishes, john kruschke--


  (cs)