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Stableisotopes of xylem water (18O and D) have been successfully used todetermine sources of soil water for plant transpiration, but mainly indrought-prone environments. The water uptake strategies of three representativetree species in Japan, namely cedar (Cryptomeria japonica), larch (Larixkaempferi) and beech (Fagus crenata), were investigated using δ18O and δD of water (precipitation, soil and xylem), together with wood α-cellulose δ13C and δ18O,along one growing season. The study was carried out in the research forest ofYamagata University (Shonai region), a high precipitation area in Japan, whichexceeds 3000 mm per year. Precipitation water δ18O and δDincreased along the summer growing season, but oxygen and hydrogen isotopiccomposition of soil water remained essentially unchanged. In general, xylemwater isotopes of cedar and larch followed the local meteoric water line, butbeech xylem water was decoupled from soil and precipitation values in July andAugust. For this tree species, the xylem water isotopic records were more depleted than cedar and larch xylem waterisotopic values and the precipitation water isotopic records, indicating thatbeech used more water from soil layers during July-August than the other twospecies, which mainly used newly-fallen precipitation. Wood δ18O showed an oppositeseasonal trend to the one found for xylem water, likely because of leaf waterisotope enrichment, which was in turn controlled by seasonal transpirationrate. The higher δ13Cvalues of cedar during summer suggested that this species had enhancedwater-use efficiency during the growing season compared with the deciduousspecies larch and beech. Our results highlight different water use strategiesamong forest tree species even in areas where the annual water balance is farfrom limiting plant performance.

Using Water Stable Isotopes to Trace Water Sources of Three Typical Japanese Tree Species under Heavy Rainfall Conditions