Search

EnglishConsidering that studies on the survival and growth of native species via direct seeding in Brazilian savannas are still scarce, the present work adds information for this technique with 36 native tree species of the Cerrado biome in relation to emergence, survival and growth in the field over three years. Thus, 11,550 seeds were sown in 2,520 pits, spaced 1×1 m, in two areas of 5,000 m2 each, in an abandoned pasture area on a Neossolo Regolitico soil at Fazenda Entre Rios, Federal District, in central Brazil, to evaluate emergence, survival and growth. Each pit received from two to ten seeds of a species, without any treatment of dormancy breaking. The emergency rate was evaluated after 120 days, and the survival of the emergents after one, two and three years. In addition, its height growth was evaluated after three years. Of the 36 species, four presented between 10% and 20% emergence and four (Copaifera langsdorffii, Hymenaea courbaril, Eugenia dysenterica and Stryphnodendron adstringens) above 20% and survival >80% after one year. In this same period, 24 of the tested species presented survival rate >60%. In general, the average survival rate of individuals in the three years was low (53%). Due to the typical slow growth in height of the individuals of the Cerrado species considered (average of 10.8 cm in three years), in the recovery of similar areas, it is also important to consider the planting of other forms of life (herbaceous and shrub) of native species, perhaps even at higher densities, to occupy the soil more quickly and thus seek to compete with exotic grasses. portuguesConsiderando que estudos sobre a sobrevivencia e o crescimento das especies nativas via semeadura direta nas savanas brasileiras ainda sao escassos, este trabalho acrescenta informacoes para essa tecnica com 36 especies arboreas nativas do bioma Cerrado com relacao a emergencia, sobrevivencia e crescimento no campo ao longo de tres anos. Assim, 11.550 sementes foram semeadas em 2.520 covas, espacadas 1 × 1 m, em duas areas de 5.000 m2 cada, em area de pastagem abandonada em solo do tipo Neossolo Regolitico na Fazenda Entre Rios, Distrito Federal, Brasil. Cada cova recebeu de duas a dez sementes de uma especie, sem qualquer tratamento de quebra de dormencia. A taxa de emergencia foi avaliada apos 120 dias, e a sobrevivencia das emergentes apos um, dois e tres anos. Alem disso, seu crescimento em altura foi avaliado apos tres anos. Das 36 especies, quatro apresentaram entre 10% e 20% de emergencia e quatro (Copaifera langsdorffii, Hymenaea courbaril, Eugenia dysenterica e Stryphnodendron adstringens) acima de 20% e sobrevivencia >80%, apos um ano. Nesse mesmo periodo, 24 das especies testadas apresentaram taxa de sobrevivencia >60%. No geral, a taxa media de sobrevivencia dos individuos nos tres anos foi baixa (53%). Devido ao tipico crescimento lento em altura observado para os individuos das especies de Cerrado consideradas (media de 10,8 cm em tres anos), na recuperacao de areas similares e importante tambem levar em conta o plantio de outras formas de vida (herbaceas e arbustivas) de especies nativas, talvez ate em densidades mais elevadas, para ocupar mais rapidamente o solo e assim buscar competir com as gramineas exoticas.