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Effects of pores distribution on transpiration rate

Li, Yanxi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696

Abstract Details

2019, Master of Science, University of Akron, Polymer Science.
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 stoma density.
Hunter King (Advisor)
Ali Dhinojwala (Committee Member)
53 p.
Biology; Biophysics; Plant Biology

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Citations

  • Li, Y. (2019). Effects of pores distribution on transpiration rate [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696

    APA Style (7th edition)

  • Li, Yanxi. Effects of pores distribution on transpiration rate. 2019. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696.

    MLA Style (8th edition)

  • Li, Yanxi. "Effects of pores distribution on transpiration rate." Master's thesis, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1569498857053696

    Chicago Manual of Style (17th edition)

akron1569498857053696
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© 2019, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.