TAILIEUCHUNG - Báo cáo khoa học: "Organic matter and nitrogen dynamics in a mature forest of common beech in the Sierra de la Demanda, Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Organic matter and nitrogen dynamics in a mature forest of common beech in the Sierra de la Demanda, Spain. | 301 Ann. For. Sci. 58 2001 301-314 INRA EDP Sciences 2001 Original article Organic matter and nitrogen dynamics in a mature forest of common beech in the Sierra de la Demanda Spain Ignacio Santa Reginaa and Teresa Tarazonab a . . Cordel de Merinas 40-52 Apdo 257 37071 Salamanca Spain b Servicio de Medio Ambiente . Villar y Macias n 1 Salamanca Spain Received 21 February 2000 accepted 9 October 2000 Abstract - Aboveground biomass litterfall leaf weight loss due to decomposition N return and seasonal leaf N dynamics were studied in the Sierra de la Demanda Spain a Mediterranean climatic zone. The forest ecosystem considered was a climax beech Fagus sylvatica L. forest. Aboveground biomass was estimated by cutting and weighing seven trees from a beech stand according to diameter classes recording the categories of trunk branches and leaves. The results indicate a total biomass of Mg ha-1. The litterfall was 4682 kg ha-1 yr-1 although variations from year to year were observed mostly due to water stress in summer. Greater K Jenny s constant and Ko Olson s constant values were obtained for total litter than for leaves alone. It is possible that the mean soil humidity might not be a limiting factor in the decomposition process and that this effect would be due to the distribution of rainfall rather than to the total amount of precipitation together with elevated temperature and airing of the holorganic soil horizon. The leaf N contents of beeches growing in the Sierra de la Demanda were studied relating the contents to other structural stand characteristics. For this N was analysed in shed leaves in leaf biomass and in leaves decomposing on a test plot in the Tres Aguas beech forest. Leaf nitrogen contents were measured over a vegetative cycle in the above beech forest. Finally leaf nitrogen contents were studied in thirty beech stands in the Sierra de la Demanda located at different altitudes. Annual nitrogen accumulation in leaf biomass was .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp