tailieunhanh - Báo cáo khoa học: "haracterizing base-cation immobilization in the stem of six hardwoods of eastern Canada"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Characterizing base-cation immobilization in the stem of six hardwoods of eastern Canada. | Ann. For. Sci. 59 2002 397-407 INRA EDP Sciences 2002 DOI forest 2002014 397 Original article Characterizing base-cation immobilization in the stem of six hardwoods of eastern Canada Patricia Boucher and Benoit Côté Department of Natural Resource Sciences Macdonald Campus McGill University 21 111 Lakeshore Ste-Anne-de-Bellevue Québec H9X 3V9 Canada Received 25 May 2001 accepted 27 November 2001 Abstract - Rates of base-cation immobilization in the stem of basswood beech red oak red maple sugar maple and white ash were compared to identify the relative potential for impoverishing soils. Two natural stands in southern Quebec were studied. Allometric equations predicting stem nutrient content from stem diameter were developed. Between 20 and 25 trees per species were sampled for age and stem diameter at breast height and the area covered by the projection of the tree crown on the ground. Rates of K Ca and Mg immobilization were assessed by dividing stem nutrient content by age and crown projection. Stem K and Ca content for similar stem diameter classes were highest in white ash and sugar maple respectively whereas red oak was lowest in stem Mg content. Overall rates of base-cation immobilization were highest in mid-successional white ash g m-2 yr-1 and red oak g m-2 yr-1 . allometric equation base-cation hardwood immobilization stem Résumé - Caractérisation de l immobilisation des cations basiques dans le tronc de six espèces forestieres feuillues de l Est du Canada. Les taux d immobilisation des cations basiques dans les tiges de tilleul de hêtre de chêne rouge d érable rouge d érable à sucre et de frêne d Amérique ont été comparés pour identifier les espèces avec un potentiel élevé d appauvrissement du sol par l immo-bilisation des cations basiques. L étude a été réalisée dans deux peuplements naturels du sud du Québec. Des équations allométriques entre le contenu en cations et le diamètre des arbres ont été établies. Vingt à 25 arbres ont été .