-(Floristic composition of palm swamp communities near Uberlândia, Minas Gerais, Brazil). Over a two-year period, four palm swamp communities near Uberlândia, MG, Brazil, were studied for their floristic composition. Transects were randomly established to cross the following zones: palm swamp border (dryish soils), middle area (intermediate soil moisture), and lower zone (with permanently satured soils). The transects were censused each month and voucher herbarium specimens were collected and identified by means of keys, comparisons with identified material at HUFU, IBGE and UB, and with the help of specialists for some families. Voucher specimens were deposited at HUFU. A total of 526 species, 250 genera and 89 families were collected. The five families with highest number of species were: Poaceae (64), Asteraceae (63), Cyperaceae (54), Melastomataceae (27) e Fabaceae (23). In the palm swamp border, 361 species were collected, 168 of which were exclusive to this zone. A total of 300 species were collected in the middle zone, of which 75 were exclusive to this area. The lower zone had the lowest species diversity, with 52 exclusive species from a total of 136 taxa. The great richness found in the palm swamp possibly is due to soil differences, especially those related to humidity. RESUMO-(Composição florística de veredas no Município de Uberlândia, MG). Foram estudadas quatro comunidades vegetais de veredas no Municipio de Uberlândia, MG, durante dois anos com o objetivo de conhecer sua composição florística. As veredas foram percorridas por meio de trilhas estabelecidas, ao acaso, passando pela borda (local de solo mais seco), meio (solo medianamente úmido) e fundo (solo saturado com água). A freqüência de visitas à cada vereda foi mensal e o material botânico coletado foi incluído no Herbarium Uberlandense (HUFU). A identificação das espécies foi feita utilizando-se chaves analíticas, consultas a especialistas de várias famílias e/ou comparação com exsicatas devidamente identificadas e depositadas nos herbários HUFU, IBGE e UB. No levantamento florístico foram registradas 526 espécies, 250 gêneros e 89 famílias. As cinco famílias com maior número de espécies foram Poaceae (64), Asteraceae (63), Cyperaceae (54), Melastomataceae (27) e Fabaceae (23). Na zona de borda da vereda foram amostradas 361 espécies sendo 168 exclusivas deste ambiente. Um total de 300 espécies ocorreu na zona de meio, sendo 75 exclusivas. Na zona de fundo ocorreu a menor riqueza específica, compreendendo um total de 136 espécies com 52 exclusivas desta área. A grande riqueza florística encontrada nas veredas amostradas deve-se, possivelmente, às diferenças edáficas, especialmente aquelas relacionadas com a umidade.

No abstract

No abstract

RESUMO -RESUMO -RESUMO -RESUMO -RESUMO -(Comparação da vegetação arbórea de cerradão e de cerrado na Reserva do Panga, Uberlândia, Minas Gerais). O estudo foi desenvolvido na Reserva Particular do Patrimônio Natural do Panga, localizada no Municí-pio de Uberlândia, Estado de Minas Gerais. Realizou-se, pelo método de parcelas, o levantamento florístico e a análise dos parâmetros fitossociológicos das espécies arbóreas com circunferência do tronco ≥ 15cm, numa faixa de 840m x 20m (1,68ha), abrangendo comunidades vegetais contíguas de cerradão e cerrado (sentido restrito). Foram coletadas amostras compostas de solo, numa profundidade de 0 a 10cm, em 12 diferentes parcelas, para determinar a sua composição química. Na amostragem total foram encontrados 3.137 indivíduos distribuídos em 107 espécies e 43 famílias. Nas 25 parcelas de cerradão (1,0ha) ocorreram 93 espécies, das quais Qualea grandiflora e Vochysia tucanorum apresentaram os maiores índices de valor de importância (IVI). Em 0,68ha de cerrado, ocorreram 76 espécies e 37 famílias, sendo que as espécies de maior IVI foram Qualea grandiflora e Q. parviflora. Fabaceae, Vochysiaceae e Myrtaceae apresentaram o maior número de espécies, nas duas comunidades vegetais. Palavras-chave -

RESUMO(Florística e zonação de espécies vegetais em veredas no Triângulo Mineiro, Brasil) A riqueza e a distribuição das espécies vegetais, a profundidade do lençol freático e a textura do solo nas zonas de borda, meio e fundo foram determinadas em cinco veredas em Uberlândia e Uberaba, Minas Gerais. A amostragem florística foi desenvolvida, mensalmente de janeiro de 2002 a janeiro de 2003 em cada vereda. As coletas de solo e as medidas do lençol freático foram feitas na parte central de cada zona das veredas. Na amostragem florística foram encontradas 436 espécies pertencentes a 59 famílias e 206 gêneros. O número de espécies encontrado nas seis veredas variou de 146 a 219. Na zona de borda, foram coletadas entre 26 e 87 espécies enquanto na zona de meio, em geral, com maior riqueza específica foram registradas entre 78 e 111 espécies. A ordenação florística mostrou variabilidade entre as veredas situadas em solo argiloso e arenoso e entre as zonas com maior e menor umidade do solo. A maior retenção de água no solo argiloso pode ter interferido na variação da flora entre as veredas em solo argiloso e arenoso. Palavras-chave: região do cerrado, lençol freático, textura do solo. ABSTRACT(Floristic and zonation of plant species in palm marshes in the Triângulo Mineiro region, Brazil) This study was performed to determine the richness and distribution of plant species, the depth of the water table and the soil texture of the border, middle and lower zones of five palm marshes in Uberlândia and Uberaba, Minas Gerais. The floristic sampling was carried out monthly from January 2002 to January 2003. The soil sampling and water table measuring were made in the central area of each sampled zone. Sampled species totaled 436 and belonged to 59 families and 206 genera. The number of species found in six marshes ranged from 146 to 219. On the border area 26 to 87 species were collected, whereas in the middle area a greater richness (78 to 111 species) was obtained. The floristic ordination showed variability between marshes located in clayey and sandy soils and between areas with high and low soil humidity. The highest water storage in the clayey soil may have interfered with discrimination of floras between the marshes on clayey and sandy soils.

Dry semideciduous and deciduous forests occur only on calcium-rich soils and occupy almost 20% of the 200 million ha of the cerrado region of central Brazil. Other savanna physiognomies of woodlands and grasslands, and gallery forests generally occur on acid soils with low calcium levels. The literature on phytosociological aspects of such cerrado physiognomies is quite abundant whereas there is very little information on deciduous forests. Also lacking is information on soil fertility and its influence on species distribution. The objective of the present study was to study the distribution of native species within a dry deciduous forest in the Araguari river valley, Uberlâ ndia, Minas Gerais as related to soil properties. A 1-ha sampling area, with no apparent difference in physiognomy, was divided into fifty 10 m · 20 m plots arrayed in 10 · 5 grid and all trees with a minimum circumference of 15 cm at 1.30 m height were surveyed. A composite soil sample was collected from 0 to 10 cm depth in each plot and soil pH, organic C and nutrient availability were determined. Cluster analysis based on soil chemical properties showed the existence of two distinct groups of plots. Further field examinations revealed that the forest was situated in an area of transition between mica schist and basalt parent materials, without any apparent difference in the forest physiognomy. The basalt-derived soil in 23 plots had significantly higher availability of Ca (47.0 cmol(+) kg -1 soil), Mg (2.59), and K (0.96) than the mica schist derived soil (Ca-18.4, Mg-1.29, and K-0.66) in the remaining 27 plots, though both soils would be classified as eutrophic. A total of 59 species belonging to 27 families were encountered in the area as a whole, of which 36 were common to both soils. In total, 16 species occurred exclusively on the mica schist soil and 7 on the basaltic soil. Myracrodruon urundeuva Allem. (Anacardiaceae) and Tabebuia roseo-alba (Ridl.) Sandwith (Bignoniaceae) were species with high importance values in the forest as a whole. Though there was no significant difference in the diversity index between the two soils, the importance values of these species was larger in the basalt-derived soil with higher nutrient availability.Joã o Paulo De Souza is a scholarship holder of CNPq.

No abstract

Palavras-chave: cerrado, murundu, vegetação, lençol freáticoABSTRACT -(Plant community and abiotic characteristics of a murundu field in Uberlândia, MG). Murundus are small usually round mounds, that often present soil and vegetation different from the surrounding level area. All micro-elevations incountered in a 1.08ha murundu field had their length, width and height measured. The depth of the water table was measured and soil characteristics were obtained within and outside the murundus. All woody plants (lianas, trees, and shrubs) with a diameter of ≥ 5 mm at ground level were identified. A total 434 elevations (31.4% of the total area) were encontered, of which 48 (24.3%) contained woody plants. The mound vegetation comprised 116 species belonging to 72 genera, and 42 families. The depth of the water table for those murunduns with woody plants varied between 99.2 and 206.8cm. The studied soil showed a low content of exchangeable bases, but only slight differences were observed between murundus and level soils. Matayba guianensis Aubl. and Erythroxylum suberosum A. St.-Hil. had the highest densities, while Copaifera langsdorffii Desf. and Blepharocalyx salicifolius (Kunth) O. Berg. showed the highest basal areas. The heigher diversity encountered here in comparison to other published reports may be due to cattle grazing and trampling as well as burning.