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| Format: | Artículo científico |
| Language: | en |
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Universidade Federal de Viçosa
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=48829501 |
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- Dry biomass distribution in a cerrado sensu stricto site in central Brazil Ailton Teixeira do Vale Jeanine Maria Felfili Agrociencias Cerrado savanna wood calorific power biomass and carbon sequestering The Cerrado has been the main source of firewood and charcoal in Brazil, but despite beingone of the hot spots for conservation of the worlds biodiversity, neither plantations of native species norsustainable management has been adopted in the region. The aim of this work was to investigate the biomassdistribution and the potential for energy production of the cerrado species. The study was conducted in acerrado sensu stricto site at the Água Limpa Farm (15º 5614 S and 47º 4608 W) in the Cerrado BiosphereReserve. An area of 63.54ha was divided in 20 x 50m plots and, a random sample consisting of ten of theseplots, representing 1.56% of the study-site, was assessed. All woody individuals from 5 cm diameter at 30cm above ground level were identified and measured. Each individual was felled, the twigs thinner than 3cmwere discarded while the larger branches and the trunks, both with bark, were weighted separately. After that,2.5cm transverse sections of the trunk with bark were taken at 0, 25, 50, 75 and 100% of the length. Asimilar sample was also taken at the base of each branch. A total of 47 species in 35 genera and 24 familieswere found, with an average density of 673 individuals per ha. The diameter distribution showed a reversed-J shape with 67% of the individuals up to 13cm, while the maximum diameter was 32.30cm. Seven speciesrepresented 72% of the total biomass. In general, the species with higher production per tree were amongthose with higher production per ha. This content was distributed by diameter classes, reaching a maximumof 2.5ton/ha between 9 to 13cm and then, decreasing to 0.96 ton/ha between 29 to 33cm diameter.Carbon sequestering was 6.2ton/ha (until the actual stage of cerrado) based on an average 50% carbon contentin the dry matter. The heat combustion of the wood varied from 18,903kj/kg to 20,888kj/kg with anaverage of 19,942kj/kg. The smaller diameter classes fix more carbon due to the large number of smallplants per ha. But, for a species that reached larger dimensions and contained individuals in all diameter classes,Vochysia thyrsoidea, one can verify an increase in carbon fixation from 1.41 kg/ha in the first class (5 to9cm) to 138,3kg/ha in the last (25 to 33cm). That indicates that it is possible to select species that reachlarger size with a higher capacity of carbon accumulation per plant. The species that reached larger dimensions,with a production per tree above average and had high calorific power values were Dalbergia miscolobium,Pterodon pubescens and Sclerolobium paniculatum. These species have potential for use in fuelwood plantationsand sustainable management. 2005 artículo científico 0100-6762 https://www.redalyc.org/articulo.oa?id=48829501 en http://www.redalyc.org/revista.oa?id=488 Revista Árvore application/pdf Universidade Federal de Viçosa Revista Árvore (Brasil) Num.5 Vol.29