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Optimization theory of stomatal behaviour I. A critical evaluation of five methods of calculation

Thomas, D, Eamus, D and Bell, Darren (1999). Optimization theory of stomatal behaviour I. A critical evaluation of five methods of calculation. Journal of Experimental Botany,50(332):383-390.

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Title Optimization theory of stomatal behaviour I. A critical evaluation of five methods of calculation
Author Thomas, D
Eamus, D
Bell, Darren
Journal Name Journal of Experimental Botany
Publication Date 1999
Volume Number 50
Issue Number 332
ISSN 0022 0957   (check CDU catalogue open catalogue search in new window)
Start Page 383
End Page 390
Total Pages 8
Place of Publication Oxford
Publisher Oxford University Press
HERDC Category C1 - Journal Article (DEST)
Abstract There are two principal aims in this first manuscript, first, to compare five methods for calculating the marginal unit water cost of plant carbon gain (E/A) of leaves of two Australian tropical tree species, and second, to test the hypothesis that E/A of tropical tree leaves is constant when leaf-to-air vapour pressure difference (D) varies. Few differences in the absolute values of E/A or the form of the response were found between species. However differences did exist between methods of calculation. Importantly, E/A was rarely constant with changing D. Stomatal limitations of net photosynthesis caused by a reduction in internal carbon dioxide concentration as stomatal conductance declined caused E/A to increase when D was increased. Some methods are applicable to canopy scale field measurements whilst others could only be used in laboratory settings where sufficient control of the environment is possible. The best method of calculation of E/A varied according to the criteria used to judge best. However, overall, despite the large numbers of independent data sets required, Method 1 was judged best for calculating E/A for individual leaves as, although it relies on the largest number of independently derived relationships, it has the fewest assumptions. Methods 2 and 3 were applicable to the field when a number of simplifying assumptions were made.
DOI http://dx.doi.org/10.1093/jexbot/50.332.383   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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