Ed: Because both temperature and day length control formation of fall colors. Up here temperature used to be the primary controlling factor (it got cold enough to cause leaves to change color and drop before the days were short enough to do so), but now it doesn't get as cold as early, so day length has more chance to cause the leaves to change.
Lee At 04:45 PM 10/27/2008, you wrote: >Lee, > >Why do you think the change of color from temperature is not well >synchronized with the timing of the color change from changes in day length? > >Ed > >"Two roads diverged in a yellow wood, And sorry I could not travel both. " >Robert Frost (1874–1963). Mountain Interval. 1920. >----- Original Message ----- >From: <mailto:[EMAIL PROTECTED]>Lee Frelich >To: <mailto:[email protected]>[email protected] >Sent: Monday, October 27, 2008 5:10 PM >Subject: [ENTS] Re: Fall colors and leaf drop > > >Steve: > >Fall colors are much later in MN, WI and MI than they were a few decades >ago. They are just past peak now in Minneapolis, whereas the peak was >usually October 5-10, 20 years ago. On the door Peninsula WI, and >Porcupine Mountains, MI the peak has moved back about 10-14 days since the >1980s. This is probably due to warmer temperatures during September and >early October. Now the leaves stay green until short days cause them to >turn, where in the old days the cold forced them to turn color before days >got so short. > >Lee > > > --~--~---------~--~----~------------~-------~--~----~ Eastern Native Tree Society http://www.nativetreesociety.org You are subscribed to the Google Groups "ENTSTrees" group. To post to this group, send email to [email protected] To unsubscribe send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/entstrees?hl=en -~----------~----~----~----~------~----~------~--~---
