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Courses of δ13C values of sucrose* (a) and bulk needle material (b) in needles of first (continuous black lines) and second (dotted black lines) year for the vegetation period 2006. Dotted vertical lines mark the halves of growing period for the 1-year-old (black) and 2-year-old needles (gray). *Water soluble organic fraction consisted of ≥97 % sucrose. Data is shown as mean values ± SD (n ≥ 3)
