H2O/CO2 diffusion rates

Bill Williams bwilliam at oyster.smcm.edu
Wed Nov 11 09:10:19 EST 1992


In article <92311.111507MEK104 at psuvm.psu.edu> , MEK104 at psuvm.psu.edu
writes:
>I tend to agree in that I'm skeptical, but I think an important
factor that
>may not be included in some of the theoretical and experimental work
is the
>heat exchange that occurrs from leaf to atmosphere.  To take the
debate full
>circle, could the relative size of individual stomata have an effect
on heat
>exchange?  This could also be way out of whack since I'm not familiar
enough
>with the literature.

Since the relevance of stomata to heat exchange is entirely through
transpiration, I don't see how this could be the case unless data for
transpiration were estimated from direct microscopic measurements of
stomatal aperture, distribution, pore length, and so on.  As far as I
know, no one has successfully modeled the biophysics of transpiration
at that level.  There is someone in Germany (name forgotten) who has
recently set up a gas-exchange apparatus with a transparent cuvette and
a long-distance microscope, so the dimensions of the pores and the
gross leaf conductance can be compared.  I haven't seen any results
yet, but they should be exciting.
___________________________________
William E. Williams, bwilliam at oyster.smcm.edu
Divison of Natural Sciences and Mathematics
St. Mary's College of Maryland
St. Mary's City, MD 20686



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