TAILIEUCHUNG - Báo cáo khoa học: "Belowground biomass seasonal variation in two Neotropical savannahs (Brazilian Cerrados) with different fire histories"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Belowground biomass seasonal variation in two Neotropical savannahs (Brazilian Cerrados) with different fire histories. | Ann. For. Sci. 58 2001 713-721 INRA EDP Sciences 2001 713 Original article Belowground biomass seasonal variation in two Neotropical savannahs Brazilian Cerrados with different fire histories Welington Braz Carvalho Delitti1 2 Juli Garcia Pausas2 and Deborah Moreira Burger1 1 Department of Ecology Institute of Biosciences University of São Paulo. CP 11461 CEP 05422-970 São Paulo Brazil 2 Centro de Estudios Ambientales del Mediterráneo CEAM C Charles Darwin 14 Parc Tecnològic 46980 Paterna València Spain Received 15 November 2000 accepted 7 March 2001 Abstract - The belowground biomass of two types of ecosystems frequently burned open savannah Campo Cerrado and protected-from-fire closed savannah Cerradão was sampled every two months during a one year period in three soil layers 0-12 13-24 25-36 cm . Living organs were separated by flotation and sieving. Belowground biomass showed significant seasonal variation values being higher during the rainy season and lower during the dry period. Fire and soil depth also had significant effects on belowground biomass. Biomass values were significantly higher in Cerradão for all months and in all soil layers. Belowground biomass was correlated significantly with climatic variables related to the water availability of the year sampled. Cerradão belowground biomass showed a higher correlation with climatic parameters than Campo Cerrado. The cerrados belowground biomass must be taken in consideration in the studies of fire effects land use change and global carbon storage and release capacity. belowground biomass Brazil cerrado fire roots tropical savannah Résumé-Variation saisonnière de la biomasse souterraine dans deux savanes tropicales Cerrados brésiliens l une protégée et l autre soumise à des incendies frequents. La biomasse souterraine de deux types d écosystème savane ouverte frequemment brũlée Campo cerrado et savane fermee protegee du feu Cerradão a été échantillonnée tous les deux mois pendant un an en trois couches de

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