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Search Results: 1 - 10 of 191253 matches for " Douglas Ant?nio de Carvalho "
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A família Arecaceae (palmeiras) no município de Lavras, MG
Joyce de Almeida Alves,Douglas Antnio de Carvalho
CERNE , 2010,
Abstract: This work identified the species of Arecaceae that occur in the County of Lavras, MG and elaborated a dichotomousanalytical key for the species found. The survey was carried out in two stages: (1) survey the main squares and gardens (municipaland privately owned); (2) survey of the species close to the margins of the Lavras County federal, state and municipal highways. Thepalm trees found were photographed and identified in loco or through herbarium survey and related literature. Thirty nine specieswere found, 5 of which are native, distributed in 25 genera. The genera with the higher numbers of species were Syagrus (6), Dypsis(3) and Roystonea (3), making up 31.58% of the species. The native species Acrocomia aculeata and Syagrus romanzoffiana occurin most edges of the travelled roads. In the survey done in the main squares and gardens, the species of the genus Dypsis, Syagrusromanzoffina, Phoenix roebelenii and Caryota urens stood out.
Valéria Evangelista Gomes Rodrigues,Douglas Antnio de Carvalho
CERNE , 2008,
Abstract: Information was gathered in rural communities of the south of the State of Minas Gerais, microregion of Alto RioGrande, municipalities of Lavas, Carrancas, Ingaí, Itumirim and Itutinga, which ones, how and what for, the native semideciduousforest species plants, in this kind of vegetation, are used for popular medicine. The inquiring method used was that proposed byAlencar & Gomes (1998) and the survey and data analysis were based on Trivinos method. Eight informants participated in the fieldwork. For each medicinal species that was sampled, notes were taken on habit and the level of occurrence. In 12 sample areas, 351individuals belonging to 64 families, 112 genres and 142 species, were surveyed. The families that presented the largest number ofnative medicinal species, were: Fabaceae - 11; Asteraceae - 10; Annonaceae, Bignoniaceae, Myrtaceae e Rubiaceae - 7; Solanaceae - 5;Aristolochiaceae, Lamiaceae, e Malvaceae - 4; Anacardiaceae, Dilleniaceae, Lauraceae, Meliaceae e Rutaceae - 3; these speciescontributed with 56,7% of the total. The genres that presented the largest number of native medicinal species were: Aristolochia eEugenia - 4; Luehea, Mikania, Solanum, Vitex e Xylopia - 3. The occurrence of rare species in the studied forest fragments was alsoverified, among which were: Geissospermum laeve (Vell.) Miers., Capsicodendron dinisii (Schwacke) Occhioni, Citronella gongonha(Mart.) R. A. Howard, Maytenus aquifolia Mart., Vitex megapotamica (Spreng.) Moldenke, Virola sebifera Aubl., Eugenia pleuranthaO. Berg, Baufourodendron riedelianum (Engl.) Engl., Solanum pseudoquina A. St.-Hil., e Styrax pohlii A. DC.
Shrub and tree species composition in the cerrados of southwest Minas Gerais
Douglas Antnio de Carvalho,Fernando Roberto Martins
CERNE , 2009,
Abstract: In order to improve the knowledge about variations in the floristic community of Brazilian cerrado, especially inregard to soil and climate conditions, we conducted a floristic assessment of the tree and shrub community of three disjoint adjacentregions situated in three municipalities of southwest Minas Gerais state (geographical coordinates 20-23oS and 44-47oW). Over aperiod of 24 months, in 49 allocated plots of 20 x 20 m, all tree and shrub species 1 m high or more in vegetative and/or reproductivestage were sampled. Additional random samples of blossoming plants were collected outside plots, and each plot was analyzed andcategorized for soil type. 170 botanical species were identified belonging to 103 genera and 46 families. Family Fabaceae and genusMiconia presented the largest number of species. Although the cerrado of southwest Minas Gerais extends over marginal areas ofoccurrence of Brazilian cerrado, its floristic composition is rich not only in species but also in genera and families. Some species foundin these cerrados also occur in local semideciduous forests, while other species that are frequently found in other areas of cerrado werenot found in southwest Minas Gerais. Tibouchina sellowiana does not feature in the list of species occurring in Brazilian cerrados.There is little similarity among the three sampled areas due to soil factors and different types of human influence in each of the areas.Alpinópolis presented cerrado sensu stricto subtype cerrado ralo, with 75 species and red-yellow latosol. Campo do Meiopresented cerrado sensu stricto subtype cerrado típico, with 88 species and red latosol. Pimenta falls under the cerrad o category,with 124 species and red latosol. On the subsurface, the soil of Pimenta was found to present lower Al+++ saturation, which apparentlyshapes conditions for a more vigorous vegetation. The cerrado soils sampled in this study showed high similarity to cerrado soils inother parts of Brazil.
Avalia??o da recomposi??o da cobertura vegetal de dunas de rejeito de minera??o, em Mataraca/PB
Carvalho, Douglas Antnio de;Oliveira-Filho, Ary Teixeira de;
Acta Botanica Brasilica , 1993, DOI: 10.1590/S0102-33061993000200006
Abstract: a phytosociological survey of the vegetation established on tailing sand dunes was carried out in the area of the mining company rutilo & ilmenita do brasil (rib), municipality of mataraca, northern coastland of the state of paraiba, ne brazil (6o29's, 34o56'w, 10 to 75 m of altitude). the purpose was to provide basic information to the environmental restauration programs which have been implemented by the company. the floristic composition and the structure (percent cover, sociability and height) of the plant community that grew on the dune were registered in 30 plots with 3 x 3m in two different sectors: a) area where a pioneer plant community regenerated after the deposition of a 20 cm layer of forest topsoil; b) area where four pioneer species were planted after localized organic fertilization. in the first sector, 51 plant species of 21 families were found whilst in the other sector the figures were 44 species and 17 families. the cover values both for the plots and the species were higher in the sector covered by forest topsoil.
Efeitos de solos e topografia sobre a distribui??o de espécies arbóreas em um fragmento de floresta estacional semidecidual, em Luminárias,MG
Rodrigues, Luciene Alves;Carvalho, Douglas Antnio de;Oliveira Filho, Ary Teixeira de;Curi, Nilton;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000100004
Abstract: the objective of the present study was to analyze the correlations between tree species distribution and environmental variables in a fragment of tropical seasonal forest in luminárias, se brazil. the fragment, locally known as "mata do galego", has an area of c. 77ha, and is located on the margin of the ingaí river at the coordinates 21°29's and 44°55'wg. the survey of the tree community, soils and topography was carried out through systematic sampling with 32 sample plots with 20 x 20m distributed on three transects which extended from the river margin to the forest edge. in these plots, all living individual trees with circumference at breast height (cbh) > 15.5cm were recorded. soil chemical and physical variables were obtained from the analysis of topsoil samples (0-20cm) taken from the center of each plot. topographic variables were obtained from a topographic survey of the plots and adjacent areas. the survey recorded 2343 individuals belonging to 159 species, 109 genera, and 50 families. the gradient analysis; performed through principal components analysis (pca), canonical correspondence analysis (cca), and detrended correspondence analysis (dca); indicated that the plots located near the forest edge and transitional to the montane grasslands are the most differentiated. variables related to soil ph and texture produced the strongest correlations with the distribution of tree species.
Florística e estrutura da comunidade arbórea de um fragmento florestal em Luminárias, MG
Rodrigues Luciene Alves,Carvalho Douglas Antnio de,Oliveira Filho Ary Teixeira de,Botrel Rejane Tavares
Acta Botanica Brasilica , 2003,
Abstract: O objetivo deste trabalho foi analisar a composi o florística e estrutural da comunidade arbórea de uma floresta em Luminárias, MG. O local de estudo é conhecido como Mata do Galego, possui cerca de 77 ha e está localizado a 21°29'S e 44°55'W, às margens do rio Ingaí. A amostragem florística foi realizada em parcelas e também em caminhadas pela floresta. Todo o material coletado foi identificado e incorporado ao Herbário ESAL, da Universidade Federal de Lavras. O levantamento estrutural foi realizado por meio de amostragem sistemática, em 32 parcelas de 20 × 20m, distribuídas em três transe es, da margem do rio até a borda da mata. Nas parcelas, foram amostrados todos os indivíduos arbóreos, vivos, com circunferência à altura do peito (CAP) ≥ 15,5 cm. As variáveis químicas e físicas do solo foram obtidas das análises de amostras superficiais de solo (0-20 cm) de cada parcela. No levantamento florístico foram amostradas 201 espécies, 129 gêneros e 57 famílias. As famílias com maior riqueza foram Myrtaceae, Lauraceae, Fabaceae Faboideae, Rubiaceae, Euphorbiaceae e Fabaceae Mimosoideae. No levantamento estrutural foram amostrados 2343 indivíduos de 159 espécies, 104 gêneros e 50 famílias. As espécies mais abundantes foram Casearia sylvestris, Lithraea molleoides, Machaerium stipitatum, Faramea cyanea, Diospyros inconstans e Copaifera langsdorffii. A Mata do Galego apresentou alta diversidade de espécies (H' = 4,23 nat/indivíduo) e alta equabilidade (J' = 0,83). A alta diversidade de espécies pode estar relacionada à influência de forma es vegetais próximas e aos diferentes microhabitats proporcionados pela topografia, varia es na fertilidade e umidade do solo.
The Bignoniaceae Juss. family (ipes) in the municipal district of Lavras, Minas Gerais
José Magno das Chagas Junior,Douglas Antnio de Carvalho,Mariana Esteves Mansanares
CERNE , 2010,
Abstract: The Bignoniaceae family has 120 genera and 800 species with pantropical distribution, occurring mainly in the neotropics. About 32 genera and 350 species occur in Brazil, which is considered the center of diversity of the family. In Minas Gerais, some surveys indicate the occurrence of species such as Dolichandra unguis-cati, Fridericia speciosa and Handroanthus chrysotrichus. Lavras studies show 58 species. The municipality is located in a transition zone between savanna and semideciduous forest, with rugged terrain, which promotes a diversity of vegetation physiognomy. The objective was to catalog the species of native and exotic Bignoniaceae of Lavras, Minas Gerais, besides the elaboration of an identification key for them. Data were collected from all herbarium specimens with record collection in the city incorporated in the Herbarium ESAL; species cited in phytosociological studies of the county and registration of ornamental species found in parks, gardens and nurseries of the city were also raised. The specimens were identified in situ, by comparisons, consultations with specialists and specialized taxonomic literature. Fifty eight species (51 native and seven exotic) were found, distributed in 21 genera, of which Jacaranda (10 species) was the most common, followed by Fridericia (8 species) and Handroanthus (7 species). Among the ornamental species stood out Handroanthus impetiginosus (Purple-ipe) and Handroanthus serratifolius (Yellow-ipe). The number of species was superior to other localities, the largest similarity observed was with species of Itacolomi State Park, Minas Gerais.
Evaluation of the antifungal activity by plant extracts against Colletotrichum gloeosporioides Penz
Silva, Polyanna Alves;Oliveira, Denilson Ferreira;Prado, Ney Robson Taironi do;Carvalho, Douglas Antnio de;Carvalho, Gilvane Aparecida de;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000200012
Abstract: aiming to develop more efficient and environmental friendly methods than those available to control colletotrichum gloeosporioides penz, which causes blister spot in coffee trees, a search for plants able to produce substances active against such pathogen was carried out. thus, extracts of 48 plant species, collected at alto rio grande region, in minas gerais, were prepared and submitted to in vitro assays with that fungus. the best results were obtained with the extracts prepared from digitalis lanata ehrh, origanum manjorona l., plantago lanceolata hook. and stevia rebaudiana (bertoni) bertoni, which inhibited c. gloeosporioides spores germination. after dilution of some active extracts with aqueous 1 % tween 80 solution in a 1:2 or 1:3 ratio (extract:aqueous solution), their antifungal activity vanished. some of the active extracts were also submitted to freeze drying and none of them presented any alteration in their antifungal activity. concluding, several plants presented potential to be used in the search for new bioactive substances to control c. gloeosporioides, especially o. manjorona l., which inhibited 96 % of the fungus spores germination.
Florística e estrutura da vegeta??o arbórea de um fragmento de floresta semidecedual às margens do reservatório da usina hidrelétrica Dona Rita (Itambé do Mato Dentro, MG)
Carvalho, Douglas Antnio de;Oliveira-Filho, Ary Teixeira de;Vilela, Enivanis de Abreu;Curi, Nilton;
Acta Botanica Brasilica , 2000, DOI: 10.1590/S0102-33062000000100005
Abstract: a floristic and phytosociological survey of the tree commnunity was carried out in a fragment of sub-montane semideciduous forest located on the margin of the dona rita hydroelectric reservoir, municipality of itambé do mato dentro, state of minas gerais, south-eastern brazil (19o26's, 43o14'w, 610-630m of altitude). all individuals with a stem diameter at the base, of dbt > 5cm (lianas excepted) found in thirty five 15x15m quadrats, were identified, measured (dbt) and had their height estimated (individuals found outside quadrats with reproductive structure were also collected). the following phytosociological parameters were calculated for all species: density per area, absolute frequency, absolute dominance calculated from the basal area, and importance value. the shannon diversity index and the corresponding evenness were calculated. jaccard's similarity indices and euclidian distances were also calculated among the studied forest and other forests surveyed in the following regions of minas gerais state: upper and mid rio grande, lower rio paranaiba and upper rio s?o francisco. a total of 2,430 individuals were recorded in the sample area. these belonged to 50 families, 144 genera and 216 species. the following families produced the highest importance values: euphorbiaceae, myrtaceae and caesalpiniaceae. the most important species were apuleia leiocarpa, pera glab rata, licania hypoleuca, and mabeafistulifera. a comparison with the other areas indicated that the forest of itambé do mato dentro is more similar to those of the upper rio grande which are all under a stronger floristic influence of the atlantic forest, although the most important species are not the same. the soils of the area are deeper, highly weathered and leached, despite the strongly sloping topography because they had gone through an intense process of alteration prior to the present pedogenetic cycle.
Flora arbustivo-arbórea de um fragmento de mata ciliar no alto rio Grande, Itutinga, Minas Gerais
Vilela, Enivanis de Abreu;Oliveira-Filho, Ary Teixeira de;Carvalho, Douglas Antnio de;Gavilanes, Manuel Losada;
Acta Botanica Brasilica , 1995, DOI: 10.1590/S0102-33061995000100003
Abstract: a floristic survey was carried out in an 9.450m2 fragment of riparian forest on the margin of the hydroelectric reservoir of camargos, itutinga, state of minas gerais, se brazil. all individuals with minimum diameter at the base of stem 5cm were surveyed in the sampled area forest. a list is provided with 253 species of trees and shrubs belonging to 66 botanic families. floristic similarity indices were calculated in comparisons with other floristic surveys of forest in the states of s?o paulo and minas gerais.
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