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Abstract. Source water utilized by four families of loblolly pine (Pinus taeda L.) was assessed by comparing the H isotope composition (D) of xylem sap and of soil water from four depths (020cm, 2040cm, 1.2m, and 2.1m) across 1year. Soil water D values varied with soil moisture content in the well-drained, sandy site and at each of the four soil depths. In September and November 1997 and May through...