Oxygen isotope ratios between soil water and stem water of trees in pot experiments

1998 ◽  
Vol 13 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Kazushi Takahashi
Keyword(s):  
Oxygen Isotope ◽  
Soil Water ◽  
Isotope Ratios ◽  
Oxygen Isotope Ratios ◽  
Pot Experiments ◽  
Stem Water

Correlations between oxygen isotope ratios of wood constituents of Quercus and Pinus samples from around the world

2001 ◽  
Vol 28 (5) ◽  
pp. 335 ◽  
Author(s):  
Margaret M. Barbour ◽  
T. John Andrews ◽  
Graham D. Farquhar
Keyword(s):  
Oxygen Isotope ◽  
Molecular Oxygen ◽  
Aromatic Ring ◽  
Isotope Ratios ◽  
Source Water ◽  
Oxygen Isotope Ratios ◽  
The World ◽  
Isotope Studies ◽  
Stem Water ◽  
Isotopic Signal

The oxygen isotope compositions of three wood constituents (the solvent-extractable portion, lignin and α-cellulose) were measured for samples collected from Quercus and Pinus trees around the world. Among Pinus samples all wood constituents were positively related to modelled δ18O of source water at the site, while among Quercus samples whole wood, lignin and α-cellulose showed positive relationships. The data support the hypothesis that many oxygen atoms in lignin exchanged with unenriched stem water during synthesis, rather than retaining the full isotopic signal from the molecular oxygen added during hydroxylation of the aromatic ring. The data also suggest that extraction of α-cellulose from wood samples is unnecessary for isotope studies looking at correlations with site parameters.

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