[FLPERMACULTURE] Interesting tree tidbit

[Micheal Wheeler]

what the link basically says is trees maintain an average internal
temperature of their leaves of about 70 deg. F regardless of climate.

http://dsc.discovery.com/news/2008/06/11/tree-leaf-temperature.html

>They compared current observed records of humidity and temperature against
the isotope ratios in the trees, and found that tree leaves were internally
cooler than surrounding air temperatures in warm climes, and warmer in cool
climes.
>Tree leaves keep cool through constant evaporation and reducing sun
exposure through leaf angles or reflective qualities. Warmth is gained by
decreasing evaporation and increasing the number of leaves per branch.
>The fact that part of this adaptation occurs at the level of entire forest
canopies, and not just within individual leaves, is one reason direct
measurements of tree temperatures have been so hard.
>Measured across an entire growing season, the forest canopy temperatures
were found to be seven to nine degrees F higher than the cool, ambient air
in the Swiss Alps.

-- 
"True affluence is not needing anything." - Gary Snyder
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.mutualaid.org/pipermail/fingerlakespermaculture/attachments/20080620/e3a8527d/attachment.html