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Báo cáo toán học: "Restitution minérale au sol par la litière dans les plantations de Pinus kesiya Royle ex-Gordon dans l’ouest du Camerou"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Restitution minérale au sol par la litière dans les plantations de Pinus kesiya Royle ex-Gordon dans l’ouest du Cameroun. | Ann. For. Sci. 56 1999 431-439 Inra Elsevier Paris 431 Article original Restitution minérale au sol par la litière dans les plantations de Pinus kesiya Royle ex-Gordon dans 1 ouest du Cameroun Raphael Njoukama Robert Oliver13 Régis Peltierc a Irad Recherches forestieres BP 285 Foumban Cameroun bCirad-AMIS BP 5035 34032 Montpellier Cedex 1 France c Engref departement foresterie rurale et tropicale BP 5093 34033 Montpellier cedex 1 France Reẹu le 20 novembre 1998 revise le 2 mars 1998 accepté le 3 mars 1998 Abstract - Nutrient return to soil through litter fall in Pinus kesiya Royle ex. Gordon plantations in West Cameroon. Nutrients return through litter fall in Pinus kesiya ex. Gordon plantations of West Cameroon. Litter production and nutrient return were studied in 14- and 36-year-old plantations of Pinus kesiya in a humid savannah of Cameroon. Litter fall was observed throughout the year with maximum fall in March in the two plots. Average annual litter production within the plantations amounted respectively to 8 293 and 9 867 kg-ha -year of which leaf fall contributed to 86 and 74 respectively and was found to be the main provider 78-95 of the nutrients that return to the soil. Nutrient translocation occurs within the older leaves before their abscission. This migration of nutrients N p K and Mg occurs from the leaves to the tree. The rates of litter decomposition in the two plots are 41 and 70 . With regard to nutrient turnover it ranges globally from 33 to 92 for N p Ca and Mg and is more than 100 for K which might have been leached during the rains. All these parameters especially translocation and return are mechanisms that confer on trees the capacity to adapt themselves to poor soils. Inra Elsevier Paris. Pinus kesiya I forest plantation litter fall translocation nutrient return Resume - La production de la litière et la restitution des bioéléments au sol ont été déterminées dans deux plantations 14 et 36 ans de Pinus kesiya en savane humide du Cameroun. .