Variation in branchlet δ13C in relation to branchlet nitrogen concentration and growth in 8-year-old hoop pine families (Araucaria cunninghamii) in subtropical Australia

摘要: *This article is free to read on the publisher's website* Carbon isotope composition (delta(13)C) of branchlet tissue at nine canopy positions, and nitrogen concentration (N-mass) four were assessed in 8-year-old hoop pine (Araucaria cunninghamii Ait. exD. Don) trees from 23 half-sib families, grown six blocks a progeny test southeastern Queensland, Australia. There was considerable variation among sampling families both delta(13)C N-mass. The positively related N-mass only for samples upper outer crown (P < 0.005). Phenotypic correlations existed between tree growth delta(13)C. Branchlet th, inner lower 0.037) height, but branchlets not or negatively 0.045). significant differences positions (upper as well northern side), with heritabilities greater than 0.40. significance these findings discussed relation water light competition within pine.