Abstract
Publisher Summary This chapter describes the relative importance of various possible sources of water available to river red gums or Eucalyptus camaldulensis. The technique used in this study monitored the stable isotope composition of water from tree sap and different possible water sources. However, a detailed analysis of isotope data and measurement of soil water status was used to provide insights into the water relations of Eucalyptus camaldulensis. The study not only addresses an important ecological problem but also provides an example of the power of isotopic methods for studying plant-water sources. Naturally occurring differences in the concentration of the stable isotopes D and 18 O were used to determine the sources of water transpired by E. camaldulensis. The comparison of tree sap and creek water δD and δ 18 O data showed that creek water is not the dominant source of water for trees flooded by creek water. The combination of the δD and δ 18 O data allowed application of a simple two end-member mixing model to estimate the proportion of groundwater and shallow soil water used by the trees.
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