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Genetic differences in δ 13 C (isotopic composition of dry matter carbon) have been evidenced among poplar genotypes at juvenile stages. To check whether such differences were maintained with age in trees growing in plantations, we investigated the time course of δ 13 C as recorded in annual tree rings from different genotypes growing at three sites in southwestern France and felled at ∼15–17 years. Wood cores were cut from tree discs to record the time course of annual basal area increment (BAI). The isotopic ratio δ 13 C was recorded in bulk wood and in extracted cellulose from the annual rings corresponding to the period 1996–2005. Discrimination against  13 C between atmosphere and tissues (Δ 13 C) was computed by taking into account the inter-annual time course of δ 13 C in the atmosphere. Annual BAI increased steadily and stabilized at about 8 years. An offset in δ 13 C of ∼1‰ was recorded between extracted cellulose and bulk wood. It was relatively stable among genotypes within sites but varied among sites and increased slightly with age. Site effects as well as genotype differences were detected in Δ 13 C recorded from the cellulose fraction. Absolute values as well as the genotype ranking of Δ 13 C remained stable with age in the three sites. Genotype means of Δ 13 C were not correlated to annual BAI. We conclude that genotypic differences of Δ 13 C occur in older poplar trees in plantations, and that the differences as well as the genotype ranking remain stable while trees age until harvest.

tree physiology

Time course of δ 13 C in poplar wood: genotype ranking remains stable over the life cycle in plantations despite some differences between cellulose and bulk wood