No abstract

-(Floristic composition and community structure of a seasonally deciduous forest on limestone outcrops in Central Brazil). The objective of this study was to analyze the floristic composition and structure of the tree component in a seasonally deciduous forest on limestone outcrops, located in the northeast region of Goiás State, Brazil. A sample composed of 25 randomly sampled plots of 20 x 20 m (400 m 2 ) within a 50 ha forest, was measured. All woody individuals ≥ 5 cm diameter at breast height (DBH) had their diameter and height measured. The tree community was composed of 39 species with a density of 734 individuals ha -1 ; the richest families were Leguminosae (11 species), Bignoniaceae (4 species) and Apocynaceae (4 species .5% of the total basal area of the forest. Several species grew on rocks, or in rock fissures or in places with a shallow layer of soil or even in litter over rocky layers. The floristic composition showed links with the "Caatinga" flora, with other patches of seasonal forests in Central Brazil and in the Pantanal, and with the Chiquitano forests of Bolivia too, containing even two species considered as endemic to the "Caatinga".Key words -"Caatinga", Central Brazil, "Cerrado" biome, seasonally dry forests RESUMO -(Composição florística e fitossociologia de uma floresta estacional decidual sobre afloramento de calcário no Brasil Central). O objetivo deste estudo foi analisar a composição de espécies lenhosas e a estrutura de um fragmento de Floresta Estacional Decidual sobre afloramento de calcário, situado na Região Nordeste de Goiás, Brasil. ), Tabebuia impetiginosa (1,36 m 2 ha -1 ) e Myracrodruon urundeuva (1,26 m 2 ha -1 ) destacando-se sobre as demais, e somando em conjunto, 61,5% da área basal da floresta. Várias espécies cresceram sobre as rochas, outras nas fissuras ou em locais com solos rasos ou apenas sobre serapilheira cobrindo camadas rochosas. A composição florística mostrou afinidade com a flora da caatinga, com outras manchas de floresta estacional no Brasil Central e no Pantanal, e nas florestas Chiquitanas na Bolívia também, contendo inclusive duas espécies consideradas endêmicas da Caatinga.Palavras-chave -Brasil Central, bioma Cerrado, Caatinga, floresta estacional decidual

No abstract

The interest in South American native plant species has been growing in recent years due to their health benefits. Brazil is one of the world's mega-diverse locations with over 40,000 different plant species representing 20% of the world's flora. The country was visited in the 19th century by European travelers and naturalists, who described the use of native plant species as food. In this study, data on 67 species was recovered from historical documents and bibliographies. Several of the recorded species show potential as functional food in laboratory studies. Other species are unknown or not yet submitted to any study, in order to verify their health benefits.

-(Floristic composition, diversity and structure of the "cerrado" sensu stricto on rocky soils in northern Goiás and southern Tocantins, Brazil). The "cerrado" sensu stricto is a savanna woodland physiognomy which occupies most of central Brazil, with the degree of canopy cover varying from 10% to 60% at a site with trees reaching up to seven meters high. It occurs mostly on deep and well-drained soils but can also be found on shallower ones. The diversity and structure of the "cerrado" sensu stricto on shallow and rocky Cambisols and Litosols were studied here. Sixteen 20 x 50 m 2 plots were sampled in a random design over patches of this vegetation in northern Goiás State and southern Tocantins. All stems from 5 cm diameter at 30 cm from the ground level were measured. Vouchers were collected and deposited at the IBGE herbarium. A total of 87 species in 65 genera and 33 families were found. Diversity index was 2.87 nats ind -1 , density was 836 stems ha -1 with a basal area of 8.4374 m 2 ha -1 . Sørensen's index indicated higher similarities between plots at the same site indicating a geographical gradient influencing the floristic composition of the "cerrado" sensu stricto on rocky soils. Czekanowski's index confirmed this trend. TWINSPAN classification final groups were defined by preferential species of more fertile soils, in opposition to those typical of dystrophic soils and to common species to gallery forests occurring on sloping terrains with gullies.Key words -cerrado, diversity, rock outcrops, savanna, woody vegetation RESUMO -(Composição florística, diversidade e estrutura do cerrado sensu stricto sobre solos rochosos no Norte de Goiás e Sul de Tocantins). O cerrado sensu stricto é uma savana que ocupa grande parte do Brasil Central, apresentando cobertura lenhosa de 10% a 60% onde árvores alcançam até sete metros de altura. Ocorre principalmente em solos bem drenados e profundos mas é também encontrado em solos mais rasos. A diversidade e a fitossociologia do cerrado sensu stricto em Cambissolos e Litossolos rochosos foram aqui estudadas. Dezesseis parcelas de 20 x 50 m 2 foram amostradas aleatoriamente sobre manchas dessa vegetação no Norte de Goiás e Sul de Tocantins. Os troncos com diâmetros a partir de 5 cm a 30 cm do nível do solo foram medidos. As coletas foram depositadas no herbário do IBGE. Um total de 87 espécies em 65 gêneros e 33 famílias foram encontrados. O índice de diversidade de Shannon foi de 2,87 nats ind -1 , a densidade foi de 836 troncos ha -1 e a área basal foi de 8,4374 m 2 ha -1 . O índice de Sørensen indicou similaridades mais elevadas entre parcelas no mesmo local, sugerindo a existência de um gradiente geográfico influenciando a composição florística do cerrado sensu stricto sobre solos rochosos. O índice de Czekanowski confirmou esta tendência. Os agrupamentos finais da classificação por TWINSPAN foram definidos por espécies preferenciais de solos mais férteis, em oposição à espécies típicas de solos distróficos e à espécies comuns com matas de galeria, que oco...