Itacolomi State Park Research Articles

Schizaeales no Parque Estadual do Itacolomi, Minas Gerais, Brasil

This work presents the taxonomic study of Schizaeales from Itacolomi State Park, located in Ouro Preto and Mariana Municipalities, Minas Gerais State, Brazil. The vegetation of the Park is mostly formed by campos rupestres and semideciduous forests. The Schizaeales is found primarily in tropics and southern temperate zones, consisting of three families: Schizaeaceae, Anemiaceae and Lygodiaceae. Fourteen taxons were found: Anemia (11 species, including three varieties), Lygodium (one species), Schizaea (one species). Six taxons were recognized as endemics to Brazil. Identification keys, descriptions, illustrations and comments are presented.

Influence of geology in the geochemistry signature of Itacolomi State Park waters, Minas Gerais-Brazil

In all geological scenarios, mineral water reactions will affect the water chemistry. As such, water resources in different rocks commonly involve different hydrogeological compartments. The aim of this work is to evaluate the influence of geology in the geochemistry signature of Itacolomi State Park waters. To do so, a survey of the geological units in the area was carried out, a geological/stratigraphic division was made, and its correlation with the main geological events was determined. Using the advantages of GIS, all the catchments were delimited. Based on this division, near 30 stream and lake segments were chosen for analyses. In each point, all physiochemical properties of the water were measured, and samples were collected to determine the concentrations of major and trace elements by ICP–OES. The dynamics of the Itacolomi State Park rock-soil and stream water solutions suggest that mixing of drainage waters from different bedrock and soil sources regulates stream water physical–chemical parameters and solute concentrations. The analytical data showed a clear correlation between the chemical compositions of the solute and the geological characteristics of the catchment. Units that are covered by iron oxide hardpan (Manso unit) and iron-banded formations (Custodio unit) show a large amount of soluble elements, including high values of Fe and Mn. On the other hand, the presence of high values of Al and K (Itacolomi unit) are a direct consequence of the presence of quartzite associated with low pH values.

Influência geológica em assinaturas químicas das águas e solos do Parque Estadual do Itacolomi, Minas Gerais

Esse trabalho apresenta uma avaliação geoquímica das águas superficiais do Parque Estadual do Itacolomi, relacionando-a com os cenários geológicos e com a geoquímica dos solos. Foram coletadas 36 amostras de solo de diferentes profundidades em pontos localizados em áreas representativas das diversas unidades litológicas. Também foram selecionados 18 pontos de amostragem de água em trechos com diferentes padrões de drenagem. os elementos maiores e traços foram determinados por ICP-OES. nas amostras de água, foram, também, determinados os parâmetros físico-químicos. Os resultados demonstram que a geologia exerce grande influência nas características químicas do solo e das águas superficiais da região. A comparação com valores-padrões definidos pelas normas CETESB 195/05 e CONAMA 357/05 indica concentrações anômalas de diversos elementos, possibilitando a comprovação da influência geológica e pedológica na qualidade das águas, já que a área de estudo é uma unidade de conservação livre de interferências antrópicas. Além disso, também foi possível observar a inadequação dessas normas em relação aos parâmetros de qualidade, que não consideram os fatores geológicos.

Papilionoideae (Leguminosae) nos campos rupestres do Parque Estadual do Itacolomi, MG, Brasil

O presente trabalho trata do estudo florístico de Papilionoideae dos Campos Rupestres do Parque Estadual do Itacolomi (PEI), localizado no sul da Cadeia do Espinhaço. O trabalho de campo foi realizado no período entre setembro/2003 e outubro/2004. Foram encontradas 28 espécies de Papilionoideae, reunidas em 18 gêneros, sendo Desmodium o mais representativo, com cinco espécies. São fornecidos neste trabalho chaves analíticas, diagnoses, ilustrações e comentários sobre a distribuição geográfica e fenologia de cada espécie.

Asplenium Badinii (Aspleniaceae), A New Endemic Fern Species from Minas Gerais, Brazil

A new species of Asplenium L. (Aspleniaceae) is described and illustrated. Asplenium badinii Sylvestre & P. G. Windisch is an endemic species of the isolated forest clumps (capoes) from Itacolomi State Park, from Minas Gerais, Brazil, in areas dominated by open rocky sites (campos rupestres). This environment is known for its high level of generic and specific endemism. The new species belongs to the A. salicifolium L. species group, with apical pinnae similar to lateral ones, smooth blades, and spores with echinate perispore. It is related to A. juglandifolium Lamark and A. bradeanum Handro. Diagnostic characters for A. badinii are the long basal segment on the acroscopic side of the proximal pinnae as well as the linear to linear-lanceolate scales on the stem.

The Orchidaceae of Itacolomi State Park in Minas Gerais, Brazil

This paper compares the partial Orchidaceae floras of Itacolomi State Park in Ouro Preto, Minas Gerais, Brazil, in two different periods. The first is represented by all colections prior to 1980, while the second comprises those of the past five years. Floral analyses document the recent collections.