On the isotopic composition of leaf water in the non-steady state

Functional Plant Biology : FPB
Graham D Farquhar, Lucas A Cernusak

Abstract

An expression is derived for the isotopic composition of water in leaves under conditions where the composition of water entering the leaf is not necessarily the same as that of water being transpired. The treatment is simplified and considers the average composition of the lamina and of the sites of evaporation. The concept of 'isostorage' is introduced as the product of leaf water content and the isotopic enrichment of leaf water above source water. It is shown that the rate of increase of isostorage is minus the 'isoflux' through the stomata, with the latter expressed as the product of the transpiration flux and the enrichment of the transpired water beyond source water. The approach of the isostorage to the steady state depends on the deviation of the isotopic enrichment of water at the evaporating sites from the steady value, and on the gross (one way) diffusive flux out of the leaf. To achieve model closure, it is assumed that the relationship between leaf water enrichment and that at the sites of evaporation depends on the radial Péclet number in the same manner as in the steady state. The equations have an analytical solution, and we also show how to calculate the results simply using a commonly available computer tool....Continue Reading

References

Aug 10, 1978·Radiation and Environmental Biophysics·F Farris, B R Strain
Mar 29, 1974·Radiation and Environmental Biophysics·G DongmannK Wagener
Jul 8, 2000·Proceedings of the National Academy of Sciences of the United States of America·B R Helliker, J R Ehleringer
Sep 18, 2001·Isotopes in Environmental and Health Studies·M SaurerY Scheidegger
Oct 12, 2002·Plant Physiology·Kim Suan GanGraham Douglas Farquhar
Dec 23, 1977·Science·S EpsteinC J Yapp
Nov 1, 2003·Functional Plant Biology : FPB·Lucas A CernusakGraham D Farquhar

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Citations

Nov 3, 2005·Journal of Experimental Botany·M S SheshshayeeM Udayakumar
Apr 24, 2007·The New Phytologist·Angela Augusti, Jürgen Schleucher
Feb 28, 2007·Plant, Cell & Environment·Margaret M BarbourNate G McDowell
Nov 9, 2006·Rapid Communications in Mass Spectrometry : RCM·Liang-Feng HanBrent R Helliker
Oct 16, 2016·Plant, Cell & Environment·M M BarbourT N Buckley
Mar 1, 2007·Functional Plant Biology : FPB·Margaret M Barbour
Jul 10, 2007·Plant, Cell & Environment·Matthias CuntzLucas A Cernusak
Mar 17, 2010·Isotopes in Environmental and Health Studies·Madavalam Sreeman SheshshayeeMakarla Udayakumar
Jan 20, 2011·Proceedings of the National Academy of Sciences of the United States of America·Ansgar KahmenTodd E Dawson
Mar 1, 2009·American Journal of Botany·Niles J Hasselquist, Michael F Allen
Jun 4, 2011·Plant, Cell & Environment·Neeta S BijoorMichael L Goulden
Jun 29, 2017·Plant, Cell & Environment·Cynthia Gerlein-SafdiKelly Krispin Caylor
Nov 23, 2005·Proceedings of the National Academy of Sciences of the United States of America·Helen W Kreuzer-MartinEric L Hegg
Mar 6, 2008·Isotopes in Environmental and Health Studies·Juske HoritaShabtai Cohen
Jun 17, 2011·Plant, Cell & Environment·Kyounghee Kim, Xuhui Lee
Apr 5, 2007·Plant, Cell & Environment·Romain L BarnardNina Buchmann

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