TAILIEUCHUNG - Báo cáo khoa học: "Mineral nutrient concentrations in sapwood and heartwood: a literature review"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Mineral nutrient concentrations in sapwood and heartwood: a literature review. | Ann. For. Sci. 59 2002 713-722 INRA EDP Sciences 2002 DOI forest 2002059 713 Review Mineral nutrient concentrations in sapwood and heartwood a literature review Pierre Meerts Laboratoire de Génétique et Écologie végétales Université Libre de Bruxelles Chaussée de Wavre 1850 1160 Bruxelles Belgium Received 18 January 2002 accepted 8 April 2002 Abstract - Patterns in mineral nutrient concentrations in sapwood and heartwood are investigated from published data for N P K Ca and Mg in 22 species of Gymnosperms and 71 species of Angiosperms. The average value of heartwood sapwood concentration ratio is element-specific increasing in the following order P N K Mg Ca . Concentrations of P N and K are mostly lower in heartwood compared to sapwood. Large variation exists in the concentration pattern of Ca and Mg whose functional significance is unclear. A phylogenetic pattern is confirmed Gymnosperms having lower mineral nutrient concentrations in wood compared to Angiosperms most strikingly so for N K and Mg in sapwood. Heartwood and sapwood concentrations are positively correlated across species and species with nutrient-poor sapwood have disproportionately poorer heartwood. The results are discussed in relation to the hypothesis that mineral nutrients are recycled from senescing sapwood. wood mineral nutrient concentration translocation resorption efficiency Gymnosperms Angiosperms Résumé - Concentrations en elements minéraux dans le bois de creur et l aubier une revue de la littérature. Les patrons de variation des concentrations en N P K Ca et Mg dans le bois de creur et l aubier sont analyses à partir de données de la littérature se rapportant à 22 espèces de Gymnospermes et71 espèces d Angiospermes. Le bois de creur est le plus souventplus pauvre en N P et Kque l aubier. Les rapports de concentration creur aubier varient selon l élément dans l ordre suivant P 0 36 N 0 76 K 0 78 Mg 1 20 Ca 1 25 . De grandes variations existent dans le .

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