TAILIEUCHUNG - Báo cáo khoa học: "Organic matter dynamics in beech and pine stands of mountainous Mediterranean climate"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Organic matter dynamics in beech and pine stands of mountainous Mediterranean climate. | 667 Ann. For. Sci. 56 1999 667-677 Inra Elsevier Paris Original article Organic matter dynamics in beech and pine stands of mountainous Mediterranean climate area Ignacio Santa Reginaa Teresa Tarazonab 11 . Cordel de Merinas 40 Apdo. 257 37071 Salamanca Spain b J. . Villar y Macias no. 1 Salamanca Spain Received 4 March 1999 accepted 16 July 1999 Abstract - Aboveground biomass litter production and weight loss of litter due to decomposition were monitored in two forest ecosystems in the Sierra de la Demanda Spain a Mediterranean climatic zone over a 3-years period. The two ecosystems were a mature beech forest Fagus sylvatica L. and a Scots pine plantation Pinus sylvestris L. . The aboveground biomass was estimated by cutting and weighing seven trees from each site according to diameter classes recording the categories of trunk branches and leaves. The results indicate a total biomass of Mg-ha 1 in the pine stand and Mg-ha 1 in the beech stand. The percentage distribution of biomass weight of trunks branches and leaves was similar in both forests. The higher biomass in relation to DBH was estimated in the beech forest which seems to indicate that it would not be very suitable to reforest land that is appropriate for beech with pine. The litter fall was 5 791 kg-ha_ -year in the pine forest and 4 682 kg-ha_ -year_ in the beech forest although variations from year to year were observed mostly due to water stress in summer. Weight loss due to decomposition of litter was similar in the two forest ecosystems apparently due to the similarity in rainfall distribution at the sites. Jenny s litter decomposition index K and Olson s litter decomposition index Ko were higher for the Scots pine stand than for the beech stand K and Ko. and respectively and Jenny s leaves and Olson s decomposition indices were similar. 1999 Inra Editions scientifiques et medicales Elsevier SAS. aboveground biomass litter fall weight loss I forest .

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