University of Akron
Effects of pores distribution on transpiration rate.
Degree: MS, Polymer Science, 2019, University of Akron
Stomata are microscopic pores in plant leaves which
control the exchange of water vapor and CO2. Except for extrinsic
factors, the gas exchange rates are predominantly determined by two
intrinsic properties: stomata size and density.Stomata size and
density has not changed much during the past 400 million years, and
previous studies have shown that higher stomatal conductance is
associated with smaller pores and higher density. It was also shown
that there exists a maximum packing of stomata after which
additional pores make less efficient use of the surface. Here we
use the load cell to measure the ethanol evaporation rates of
differently distributed pores. We verify that for the same covering
fraction, smaller pores can evaporate more without the wind and the
evaporation rate is only depended on the interplay among ah for
a(pore radius), (density),and h(boundary layer). However, for flow
speeds of 1m/s,3m/s with different pore radii, the transpiration
rate is only depended on the covering fraction instead of ah. We
can quantify this phenomenon with the theoretical equation when the
resistance of vapor shell is negligible. While we also found when
the pore depth is much larger than radius, additional terms to the
simplified theory must be included. On scales and wind speeds
relevant to natural leaves, the transition we found above rarely
occurs because considering the microscopic stoma-scale and higher
Advisors/Committee Members: King, Hunter (Advisor).
Subjects/Keywords: Biophysics; Biology; Plant Biology
to Zotero / EndNote / Reference
APA (6th Edition):
Li, Y. (2019). Effects of pores distribution on transpiration rate. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696
Chicago Manual of Style (16th Edition):
Li, Yanxi. “Effects of pores distribution on transpiration rate.” 2019. Masters Thesis, University of Akron. Accessed December 08, 2019.
MLA Handbook (7th Edition):
Li, Yanxi. “Effects of pores distribution on transpiration rate.” 2019. Web. 08 Dec 2019.
Li Y. Effects of pores distribution on transpiration rate. [Internet] [Masters thesis]. University of Akron; 2019. [cited 2019 Dec 08].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696.
Council of Science Editors:
Li Y. Effects of pores distribution on transpiration rate. [Masters Thesis]. University of Akron; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696