Study to estimate the transpiration rate of a single tree by leaf using lysimeter and porometer method

Abstract

To evaluate mitigation effect by trees of urban heating, it is important to obtain transpiration per area of tree crown projection, which can easily be utilized for environmental and/or construction industries not only for greening one. Using actual Zelkova serrata, we measured transpiration by Lysimeter (L) and Porometer (P) in 12 hours of daytime in mid-summer. The ratio of values (L:P) turned out to be 1.00 : 0.83, implicating possibility or usefulness of Porometer method which gives the results of measurement on site.