RESUMO:Conduziu-se este trabalho, com o objetivo de conhecer a composição florística do estrato arbóreo de uma área de cerradão, domínio do Cerrado, na Floresta Nacional de Paraopeba -FLONA, município de Paraopeba, estado de Minas Gerais, Brasil (19°16'19"S e 44°24' 06"W). Foram instaladas 30 parcelas de 10 x 10 m, em transectos de 10 x 100 m, totalizando 3.000 m². A distribuição dos transectos foi feita sistematicamente ao longo da trilha, distanciadas 20 m entre si. Foram encontrados 1172 indivíduos/ha, com um total de 61 espécies, pertencentes a 53 gêneros, representados em 30 famílias. As famílias com maior riqueza de espécies foram Fabaceae (Leguminosae) (10) e Vochysiaceae (5), seguidas por Rubiaceae, Sapindaceae, Myrtaceae e Bignoniaceae (4). Das 61 espécies identificadas, pode-se afirmar que 44 (72%) são acessórias e apenas 17 (28%) peculiares de Cerrado, o que evidencia que as espécies de formações florestais encontradas no cerradão parecem ocorrer em seu limite de distribuição, caracterizando o cerradão como uma vegetação de transição entre as florestas e o Cerrado, uma vez que o Cerrado sensu lato comporta-se como um mosaico de espécies peculiares e acessórias, que se sobrepõem ao longo de todo o seu domínio.Palavras-chave: Diversidade, espécies acessórias, espécies peculiares, cerrado. FLORISTIC OF AN AREA OF CERRADÃO WITHIN THE NATIONAL FOREST OF PARAOPEBA -MINAS GERAIS
RESUMO -Com o intuito de selecionar espécies que possam ser testadas na recuperação de áreas com alta concentração de arsênio, foram estudadas 10 áreas de Cerrado degradadas pelo garimpo de ouro em Paracatu, MG. Utilizou-se a escala de valores de cobertura e abundância de Braun-Blanquet, sendo as espécies classificadas também quanto à forma de vida de Raunkiaer. CERRADO SPECIES WITH POTENTIAL FOR RECOVERY OF DEGRADED AREAS FOR GOLD MINING, PARACATU-MG ABSTRACT -The objective of this work was to study species that can be tested in the recovery
The Brazilian savanna is a mosaic of phytophysiognomies influenced by edaphic and topographic factors that range from the occurrence of fires to anthropic disturbance. The goal of this study was a comparative analysis between two cerrado areas in southeastern goiás, relating the floristic composition and structure of the vegetation to soil properties to better understand the physiognomic characteristics of the region. Twenty-five 20 × 20 m plots were used. All plants with circumference at breast height of more than 15 cm were measured. Soil samples collected at a depth of 0-20 cm were subjected to physical and chemical analyses. canonical correspondence analysis (cca) was used to detect possible correlations between the soil properties and species abundance and distribution. The density and total basal area were 1,647 ind/ha and 15.57 m 2 /ha, respectively, in Ouroana. At this site, 107 species were sampled. In Montes Claros de Goiás, the density and total basal area were 781 ind/ha and 17.62 m 2 /ha, and 120 species were sampled. The soil texture of Ouroana was sandy and significantly different from the medium to clayey texture of Montes Claros. The soils of both areas are dystrophic, however, more fertile in Montes Claros and aluminum-toxic in Ouroana. The species of vegetation were distributed according to soil fertility levels. The CCAs grouped species according to soil properties that defined location and abundance as well as the phytophysiognomies of the studied areas.
-The seed bank is the reserve of viable seeds found in the soil and is related to diversity and abundance of species that make up the weed populations. This study aimed to determine the seed bank in four distinct environments (grazing area, area of vegetables, annual crop area and perennial crop area) in two seasons (rainy and dry season). To determine the seed bank, each environment was divided into four sub-areas of 0.2 hectares, considering that each area was a repetition, totaling 16 experimental units. Samples of 0.8 kg were taken from each area, and each sample was distributed on a plastic tray and allowed to germinate in a greenhouse. The density of the individuals was determined by observing the number of emerging seedlings in the trays, performing the counting at every 18 days. Evaluations were made for ninety days in each season. The germination curve was calculated, as well as the Shannon diversity index (H'), the Sorensen similarity index and the relative importance. The seven main species identified in the environments were Cyperus rotundus, Nicandra physaloides, Galinsoga parviflora, Alternanthera tenella, Panicum maximum, Portulaca oleracea and Eleusine indica. Among the studied environments, during the rainy season, the highest number of individuals was found in annual crop and the greatest diversity in the evergreen environment. During the dry season, the number and diversity of individuals were lower and similar in all environments.Keywords: rainy season, dry season, Shannon index, relative importance, diversity. Palavras-chave: estação das chuvas, estação da seca, índice de Shannon, importância relativa, diversidade. RESUMO -O banco de sementes é a reserva de sementes viáveis encontradas no solo e está relacionado à diversidade e abundância das espécies que compõem as populações de plantas daninhas. Com este estudo, objetivou-se determinar o banco de sementes em quatro ambientes distintos (área de pastagem, área de hortaliças, área de cultura anual e área de cultura perene), em duas épocas do ano (estação das chuvas e da seca
Os objetivos deste trabalho foram determinar a composição florística de um fragmento de Floresta e analisar a sua similaridade com outras áreas de Floresta Estacional Semidecidual e Floresta Ombrófila Densa, com o intuito de classificar a tipologia florestal da área de estudo. O levantamento foi realizado em uma trilha interpretativa na Pousada Serra D'Água (20º41'24"S e 42º29'47"W, 1.100 m de altitude), região de entorno do Parque Estadual da Serra do Brigadeiro (PESB), Município de Araponga, MG. A listagem florística foi obtida a partir do levantamento fitossociológico, no qual foram demarcados 150 pontos quadrantes. Foram relacionadas 147 espécies, 98 gêneros e 50 famílias. As famílias com maior número de espécies foram: Melastomataceae (14), Leguminosae (11), Myrtaceae (10), Rubiaceae (8), Annonaceae (7), Flacourtiaceae (7), Lauraceae (7) e Meliaceae (6). Os resultados da análise de agrupamento revelaram que os aspectos de proximidade geográfica e altitude são os principais responsáveis pela similaridade florística de muitas áreas. A vegetação da área de estudo pode ser classificada como Floresta Estacional Semidecidual Montana, pelo fato de a sua composição florística mostrar alta similaridade com outras áreas dessa mesma tipologia.
Natural regeneration of cerrado under plantation of Eucalyptus camaldulensis Dehn. in the north of Minas Gerais, BrazilThe formation of homogeneous landscapes has become a problem in conservation biology, since these crops directly interfere in the dynamics of communities. Therefore, the objective of this study was to determine the floristic composition and structure of the natural regeneration of cerrado in the understory of Eucalyptus camaldulensis and verify whether the regeneration differs depending on the distance from the edges of the stand. The present work was carried out in the municipality of Montes Claros, MG. Two plots were demarcated for the survey, each subdivided into nine subplots of 10x10 m each, using the height e" 0.30 m as the inclusion criterion . A total of 2,413 individuals were recorded. In Plot 1, we sampled 914 individuals belonging to 63 species and 26 families; Eugenia dysenterica, Hymenaea stigonogocarpa, Calliandra sp. and Duguetia furfuracea were the most important species according to the Importance
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