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Within-ring delta C-13 spatial variability and interannual variations in wood cellulose of two contrasting provenances of Pinus pinaster

Abstract : The carbon isotope composition (d13C) of cellulose extracted from wood samples was measured on 26-year-old maritime pine trees (Pinus pinaster Ait.) of the mesic French provenance Landes and of the drought-resistant Moroccan provenance Tamjoute, all growing at the same location in France. Analysis of spatial variability revealed that intra-ring d13C values varied over a range of about 0.5%o (mean SD = 0.12%o) for circumference and of about 1%o (mean SD = 0.22%o) for height and that interannual variability of d13C was 3%o. The successive year-to-year d13C values on four trees (from 1972 to 1991) were found to roughly parallel the variations of a water stress index, calculated by taking into account climatic variables as well as the level of the water table in the soil: d13C increased with drought. The two provenances (30 trees per provenance) were compared at a juvenile stage (old rings) and at a mature stage (recent rings). The drought-resistant provenance (Tamjoute) presented lower d13C values, independent of ring age. Relationships between d13C and tree height are discussed both at the within- and between-provenance levels.
Keywords : PIN MARITIME
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Anne Nguyen-Queyrens, André Fehri, Denis Loustau, Jean-Marc Guehl. Within-ring delta C-13 spatial variability and interannual variations in wood cellulose of two contrasting provenances of Pinus pinaster. Canadian Journal of Forest Research, NRC Research Press, 1998, 28 (5), pp.766-773. ⟨10.1139/cjfr-28-5-766⟩. ⟨hal-02698172⟩

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