Dynamics of nutrient translocation in stemwood across an age series of a Eucalyptus hybrid
Laclau, Jean-Paul | Bouillet, Jean-Pierre | Ranger, Jacques | Joffre, Richard | Gouma, Raphaël | Saya, Aubin | Programme arbres et plantations forestières (Cirad-Foret Programme arbres et plantations forestières) ; Département Forêt (Cirad-FORET) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Unité de recherche Biogéochimie des Ecosystèmes Forestiers (BEF) ; Institut National de la Recherche Agronomique (INRA) | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Auteur indépendant | We are grateful to the founders of UR2PI, the Republic of the Congo, CIRAD-Forêt and ECO s.a. for financial support.
International audience
Показать больше [+] Меньше [-]Английский. Despite the continuous nature of growth of eucalyptus hybrids in Congo, taper functions fitted to stem profiles of one clone throughout stand development, combined with annual tree measurements, made it possible to locate accurately the position of annual rings in stems. Annual rings were identified on discs of wood sampled every 4 m in four trees cut from 1-, 2-, 3-, 4-, 5-, 6- and 7-year-old stands. Chemical analysis, performed individually for each ring per level and per tree sampled, made it possible to quantify the changes in nutrient content of the rings during stand development. Nutrient translocation in stemwood was thus calculated in a stepwise manner between trees of two successive ages. The cumulated nutrient translocations in stemwood from the 1-year-old stage to the 6-year-old stage amounted to 18·5 kg ha−1N, 4·2 kg ha−1P, 38·8 kg ha−1K, 1·5 kg ha−1Ca and 3·2 kg ha−1Mg. They represented 11, 18, 121, 6, and 15% of the amounts of N, P, K, Ca and Mg accumulated in stemwood, respectively, at the 7-year-old stage (logging age). Negative translocations of N, P, Ca and Mg in stemwood between 6 and 7 years might indicate an improvement in the nutritive status of the stand at the end of the rotation. Much translocation of K in stemwood suggests that this process might be involved in the high use efficiency of this element.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Institut national de la recherche agronomique