[Show abstract][Hide abstract] ABSTRACT: Este trabalho procurou identificar e quantificar espécies colonizadoras e estrutura em área de empréstimo, assim como listar espécies para recuperação de áreas degradadas. Foram selecionados três ambientes, sendo o ambiente 1 (A1) com histórico de uso menos intenso; ambiente 2 (A2) nível de degradação intermediário e ambiente 3 (A3) com maior degradação. Nos três ambientes foram sorteadas 20 parcelas de 25 m2. Nestas, foram amostrados todos os indivíduos com altura ≥ 0,10 m e DAS ≤ 5,0 cm. Foram calculados os índices de diversidade de Shannon (H’), equabilidade de Pielou (J’), similaridade de Jaccard e Czekanowski, assim como os parâmetros fitossiológicos e a análise de espécies indicadoras. Foram registradas 32 espécies pertencentes a 15 famílias. O ambiente A1 foi o mais rico em espécies e com maior densidade e A2 apresentou a menor riqueza e densidade. Os ambientes apresentaram baixa similaridade florística e estrutural, sendo observadas diferenças estatísticas para a densidade (sendo encontrados 844, 270 e 497 indivíduos em A1, A2 e A3, respectivamente) e diversidade que variou entre 1,680 a 2,074 nats.indivíduo-1. Provavelmente, estas divergências se devem às variações do ambiente impostas pelas diferentes intensidades de degradação.
[Show abstract][Hide abstract] ABSTRACT: The objective of this study was to evaluate the tree flora in a fragment of semi deciduous forest in the region of the Espinhaco, with aim to propose species for restoration of areas degraded by mining exploitation of iron in similar ecosystems. The inventory floristic and structural of vegetation of shrubs and trees was conducted in September 2007, by the quadrants-point method according to the method of minimum distances, whose inclusion criterion of the stem above the height 1.3 m. The individual were stratified into adults (DBH >= 5.0 cm) and juvenile (DBH < 5.0 cm). We sampled 90 points, which were identified 94 species, 70 genera and 32 families. For the diversity index of Shannon, values presented for each layer were 3.96 nats.ind(-1) and 3.94 nats.ind(-1), and equability of Pielou were 0.896 and 0.938, respectively for layer juvenile and adult. Families that stood out by the number of species were Myrtaceae (17), Fabaceae (12), Rubiaceae (8), Euphrobiaceae (6), Sapindaceae (5) and Lauraceae (5). For the recovery area were selected seven groups of species that will be used for recuperation of degraded areas. The characteristics of the species were sufficient for the definition of functional groups that can be used in recuperation of degraded areas.
[Show abstract][Hide abstract] ABSTRACT: The chemical composition of the essential oil obtained by hydrodistillation from fresh leaves of Blepharocalyx salicifolius (Kunth) O. Berg (Myrtaceae) was analyzed by gas chromatography/mass spectrometry (GC/MS). Twenty-two compounds were identified and a predominance of sesquiterpenes was observed (twenty sesquiterpenes-96.53%). This study presents for the first time the qualitative chemical composition of the essential oil from the leaves of B. salicifolius in their native habitat of Brazilian Cerrado. The qualitative chemical profile of essential oil obtained from the specimen in Cerrado differs from those obtained from specimens collected in biomes of southern parts of South America.
No preview · Article · May 2014 · Boletin Latinoamericano y del Caribe de Plantas Medicinales y Aromaticas
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to verify the presence of environmental indicator species and the influence of rocky outcrops on the ecological patterns of woody plant species in a Cerrado stricto sensu. Ten plots were sampled where information regarding rocky outcrops and all live individuals with DAG ≥ 5 cm were registered. Detrended Correspondence Analysis (DCA) was performed to assess floristic relations, while Indicator Species Analysis (ISA) was used to determine the environmental preferences of species. Phytosociological parameters were calculated, and the Student's t test was conducted for independent samples with some structural variables. The DAG of live individuals confirmed the existence of two environments and showed that the presence of rocky outcrops changes the floristic composition between them. The ISA verified the presence of environmental indicator species. The presence of rocky outcrops changed the group of species presenting higher Importance Value (VI) in each environment; however, no significant differences were found between the structural parameters assessed in each environment.
Full-text · Article · Mar 2014 · Floresta e Ambiente
[Show abstract][Hide abstract] ABSTRACT: There is a large increase of degraded areas as result of mining activities in Brazil. This research aims to evaluate growth of the Eremanthus erythropappus on mining reject of quartzite, under the influence of mineral and organic fertilizer. We developed an experiment in a greenhouse, in completely randomized design with four replications. The treatments consisted of five combinations of mineral (MF) and organic (OF) fertilizer, and an additional treatment of mining reject without MF and OF (witness). The combinations were as follows: 0%OF/100%MF; 25%OF/75%MF; 50%OF/50%MF; 75%OF/25%MF; 100%OF/0% MF. Doses of 100% MF and OF were: 0,15 g of N, 0,32 g of P2O5, 0,18 g of K2O, and 5 g of bovine manure per dm3 of mining rejects. The Eremanthus erythropappus responded to mineral fertilization with recommended doses of 0,075 g N, 0,16 g P2O5 and 0,09 g K2O and 2,5 g of bovine manure per dm3 of mining reject of quartzite. The accumulation of nutrients in the species Eremanthus erythropappus on the shoot was as follows: K > N > P > Ca > Mg >S > Mn > Fe > B > Zn > Cu.
[Show abstract][Hide abstract] ABSTRACT: O objetivo do trabalho foi avaliar o uso da Amostragem Adaptativa Cluster (AAC) na
quantificação de indivíduos adultos de Caryocar brasiliense Camb. (Pequi), em
comparação aos métodos de amostragem tradicionais. Foi feito um censo com mapeamento
dos indivíduos adultos de pequi em uma área de cerrado de 36,5ha no Parque Estadual
do Rio Preto/MG. O mapa gerado foi divido em unidades de 20×20m no qual foram
testadas cinco alternativas de amostragem utilizando a Amostragem Casual Simples,
Amostragem Sistemática e Amostragem Adaptativa Cluster. A comparação entre elas foi
feita através do teste F de Graybill a 1% de significância, considerando os
parâmetros precisão e exatidão. Todas as alternativas apresentaram boa exatidão,
sendo a Amostragem Adaptativa Cluster, com condição de inclusão igual a 2, a mais
[Show abstract][Hide abstract] ABSTRACT: Herbicides with known selective action have been used to control weeds in reforestation. Thus, this study evaluated the sensitivity of some tree species of commercial interest and the recovery of degraded areas to glyphosate, aiming at adapting the most efficient methods to control weeds. To perform the experiment four species were selected, namely: Plathymenia reticulata, Bowdichia virgilioides, Kielmeyera lathrophyton and Solanum lycocarpum. The effect of the application of four doses of glyphosate (0, 160, 480, 1440 g ha-1) on the variables: intoxication, plant height, height diameter collect, leaf number and leaf anatomy. For anatomical characterization of the species were also carried out on the leaves of Solanum lycocarpum individuals remaining, Kielmeyera lathrophyton and Bowdichia virgilioides. The most obvious symptoms were leaf chlorosis and necrosis, S. lycocarpum being the species most affected by the action of the herbicide. The highest mortality rate was observed for S. lycocarpum, and all individuals who received higher doses of glyphosate treatments died. The symptoms of intoxication and the normal development of seedlings Plathymenia reticulata, Bowdichia virgilioides, Kielmeyera lathrophyton are indications that these species are tolerant to glyphosate.
[Show abstract][Hide abstract] ABSTRACT: The climate and soil have a close relationship with the vegetation of a particular locality. In order to better understand this dynamic environment of the Brazilian Cerrado, this study aimed to evaluate in the region of Diamantina, high valley of Jequitinhonha, Minas Gerais, Brazil, the interaction between climate variables and the physiognomies of the Rupestrian Savannah and the Rupestrian Field environments and also relate the soil characteristics and species composition with the weather conditions. The climate variables used to characterize the Savannah environments were: temperature; relative humidity; actual and saturated vapor pressure; vapor pressure deficit; wind speed and direction; rainfall; incoming solar radiation; and temperature amplitude. For such analysis, data from two weather stations located close to the two environments were used. The Rupestrian Field distinguished from the Rupestrian Savannah mainly because of the higher wind speed, lower maximum relative humidity, lower actual and saturation vapor pressure, lower maximum and average temperature and lower temperature amplitude. The overall effect of climatic variables plus the geologic considerations discussed, in this study, justifies the physiognomy differences found between the Rupestrian Savannah and the Rupestrian Field.
No preview · Article · Sep 2013 · Revista Brasileira de Meteorologia
[Show abstract][Hide abstract] ABSTRACT: The aim of this study was to determine the spatial distribution of adult individuals of Caryocar brasiliensis Camb. (Pequi) and the distribution of potential classes of fruit production, and thus help define the sampling method for this species. To this end a census of the adult population of pequi (diameter at 0.30 cm and height ≥ 5 cm) in a cerrado area of 36.5 ha in the Rio Preto State Park / MG was carried out. The population was divided into four classes of productivity and the spatial distribution was evaluated for each class and for the total, through Ripley's univariate K function. The significance of the deviations of the distribution was determined through the construction of an "envelope" of complete spatial independence, calculated by means of 999 simulations. The results show that: (i) populations of adult pequis in the cerrado area, as well as class size up to 30 cm, occur in the aggregate pattern and (ii) individuals above 30 cm DAS pattern aggregate only in larger scales of observation. That means that sampling designs with randomized or systematic sampling units would probably not be accurate for the quantification of the species, because the probability of these are located between clusters.
No preview · Article · Jun 2013 · Scientia Forestalis/Forest Sciences
[Show abstract][Hide abstract] ABSTRACT: This work aimed to verify the existence of variations in composition and distribution of tree species due to soil characteristics in a fragment of dystrophic savanna in Curvelo-MG. On description in the compartment of the phanerophytes of this plant community, were installed ten permanent plots with 1.000 m2 (20 x 50 m) with fixed distances of 100 m between each plot. All alive individuals that had diameter at soil height (DSH - diameter to 0.3 m from ground level) > 5.0 cm were sampled. The Individuals with multiple boles were sampled when the value of square root of the sum-square of DSH had been greater than criterion of the inventory. Were collected Soil samples at two depths (0-20 e 20-40 cm) and was measured the distances of plots of a watercourse. To study the community were generated ordination diagrams of plots, species and environmental variables by means of a canonical correspondence analysis (CCA). The richness sampled was 92 species, 36 families and 74 genera, Erythroxylum, Byrsonima, Myrcia and Qualea. Jackknife estimators (first and second order) designed a wealth of 106.4 and 107.8 species. The species Magonia pubescens, Terminalia argentea, Annona crassiflora, Eugenia dysenterica e Xylopia aromatica were distribuited underneath the environmental gradient.
[Show abstract][Hide abstract] ABSTRACT: Studies dealing with the interference of weeds in agro-ecosystems have obtained abundant results for grain production fields and pastures. However, few studies have reported the effect of the presence of such a group of isolated plants on degraded areas under recovery. Thus, this study aims to evaluate the influence of the soil seed bank on the process of environmental restoration of a representative area of campestre cerrado due to the presence of weed grasses. To assess the seed bank, three environments were selected: two degraded environments and one reference-environment (preserved) of campestre cerrado. Soil samples were collected in two seasons (dry and wet), and evaluated in three hundred days. During the evaluation, only six native species and only two species with a habit of arboreal life were found. Most of the seeds which were germinated for the degraded environments in both collections were identified as invasive in the study area. In this sense, the local soil seed bank is not considered sufficient for recovery through ecological succession in these areas, and the use of techniques to accelerate the restoration of these environments is strongly recommended.
[Show abstract][Hide abstract] ABSTRACT: A espécie Lychnophora pohlii Sch. Bip.(Asteraceae), conhecida como "Arnica mineira", é uma planta largamente utilizada na medicina popular e muito abundante na vegetação de campo rupestre de altitude. Nesse contexto, este trabalho teve como objetivo estudar a densidade dessa espécie e sua relação entre os parâmetros do solo em uma área de campo rupestre em Diamantina, região do Alto Jequitinhonha, Minas Gerais. Foram alocadas 10 plotas contíguas de 20 x 50 m, totalizando uma amostragem de 10.000 m2, localizadas dentro do Campus Juscelino Kubitschek da Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM). Nessas plotas, os indivíduos foram avaliados quanto à frequência, dominância e densidade. Estudou-se a relação da densidade dessa espécie com nove atributos químicos e físicos do solo por meio da análise de correspondência canônica (ACC). A maior abundância de indivíduos (I) da espécie Lychnophora pohlii Sch. Bip. foi verificada nas plotas de amostragem da vegetação de número 6, com 255 indivíduos; 7, com 173; 8, com 189; 9, com 159; e 1, com 151. Verificaram-se nessas plotas características florísticas e do solo semelhantes, resultando em uma proximidade espacial quando representadas nos diagramas da ACC. Maiores densidades da espécie Lychnophora pohlii Sch. Bip. foram encontradas em plotas com os maiores valores de pH, P-rem e saturação por bases, variáveis essas mais fortemente correlacionadas pelo primeiro eixo da análise de correspondência canônica.
Full-text · Article · Jun 2013 · Revista Brasileira de Ciência do Solo
[Show abstract][Hide abstract] ABSTRACT: The main goal was to understand the dynamic process of vegetation colonizing an area degraded by the extraction of gold. The study area was stratified into three environments and, in each environment, contiguous ten plots of 100m2 each were allocated. For the realization of the dynamics, two surveys of shrub-tree with level of inclusion (DAS30 > 3 cm) were carried out. The first one was realized in 2008 and second in 2010. In 2010, the new individuals that met the criterion for inclusion (recruits) were marked and measured, the dead registered and the survivors were measured again. The rates of mortality, recruitment, gain and loss in basal area of each environment were calculated and it became evident the importance of dynamics as a tool to help understand the relationships of ecological succession of species. The Shannon diversity index among the three environments were compared by t-test of Hutcheson and it was used the analysis of indicator species to determine species preferences of each of the three pre-determined environments.The total number of individuals passed of 707 to 909 in two years of interval, reinforcing the importance of natural regeneration processes of ecological succession. The environment II remained the most abundant one despite it presented a high mortality rate, which can be explained by the high rate of recruitment. The species Eremanthus incanus, Trembleya laniflora, Trembleya parviflora, Roupala montana, Coccoloba brasiliensis and Tibouchina candoleana, presented higher importance of value in the two surveys, showing superiority in the colonization of the area degraded by the extraction of gold and could be indicated in programs for the recuperation of degraded areas that are in similar conditions in the region of Diamantina municipality.
No preview · Article · Jan 2013 · Ciencia Florestal