Abstract
Changes in root zone water storage between 0 and 1 m depth were monitored at 14-day intervals under contrasting canopies of Eucalyptus nitens (a gum) and Eucalyptus delegatensis (an ash) during their fourth and fifth years of growth and periods of non-limiting and limiting water availability, respectively. The leaf area index of the gum remained approximately double that of the ash throughout this time. Stem volume growth differed by factors of 1.8 and 2.0 between E. nitens and E. delegatensis while total water use differed by factors of 1.1 and 0.9 in two periods, respectively. A cumulative plot of volume growth as a function of total evapotranspiration suggested that stem volume growth of E. nitens was less sensitive to severe water stress than that of E. delegatensis.
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