tailieunhanh - Báo cáo khoa học: "iomass of root and shoot systems of Quercus coccifera shrublands in Eastern Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Biomass of root and shoot systems of Quercus coccifera shrublands in Eastern Spain. | 803 Ann. For. Sci. 57 2000 803-810 INRA EDP Sciences Original article Biomass of root and shoot systems of Quercus coccifera shrublands in Eastern Spain Isabel Canellas Rey de Vinasa and Alfonso San Miguel Ayanzb a Dpto Selvicultura CIFOR-INIA 28080 Madrid Spain b Dpto. Silvopascicultura . Montes Ciudad Universitaria 28040 Madrid Spain Received 12 October 1999 accepted 14 February 2000 Abstract - Belowground and aboveground biomass of kermes oak shrublands Quercus coccifera L. an evergreen sclerophyllous species common in garrigue communities in Spain have been studied by controlled excavation and harvesting. Aboveground biomass has been measured on 320 1-m1 2 plots. Total biomass varies with age and ranges between 7 months to kg m-2 . 40 year and leaf biomass increases with age until 6-8 years kg m-2 . and then decreases and reaches a steady state around kg m-2 . 40 year . Total belowground biomass ranges from 34 to 81 mg ha-1 . including rhizomes and lignotubers. Roots and rhizomes were concentrated in the uppermost 15 to 35 cm of the soils. The root area always exceeded the shoot area. The average dry weight root shoot ratio was ranging from to . It is quite higher than that of other Mediterranean ecosystems. Kermes oak productivity Quercus coccifera shoot biomass root biomass root shoot ratio Résumé - Biomasses des systèmes souterrains et aériens des garrigues de Quercus coccifera de l Est de l Espagne. Les biomasses souterraines et aériennes de Quercus coccifera espèce arbustive et persistante assez courante dans les garrigues espagnoles ont été mesurées au moyen de techniques d excavation et de coupe. La biomasse aérienne a été mesurée sur 320 placettes de 1 m2 chacune. La biomasse totale change avec l âge en prenant des valeurs qui varient entre les kg m-2 . à l âge de 7 mois à kg m-2 40 années . De même la biomasse foliaire augmente avec l âge jusqu à 6-8 ans kg m-2 . et diminue .