Estudo fitofisionÃmico por classes de solos na EstaÃÃo EcolÃgica de XingÃ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The landscape is an answer to the present and past climate conditions, that results in several relieve forms, different kind of soils and vegetation. From this principle, this work had as main objective to analyze the phytophysiognomy of areas with different pedologic units of Xingà Ecological Station. For attending this purpose, it was studied the âBioclimate as modelating agent of pedo-landscapesâ, the âClassification of landscapes according geological and climatic componentsâ, and finally, the âPhytophysiognomic study through soil classesâ. These three aspects of the research, despite of being separated for methodological questions, in reality makes part of only one project. The Xingà Ecological Station, whose area embraces part of the States of Alagoas (Delmiro Gouveia and Olho DâÃgua do Casado), Sergipe (Canindà do SÃo Francisco) and Bahia (Paulo Afonso), is under coordinates 09 25â 00â to 09 40â 00â S and 37 45â 00â to 38 05â 00â W Gr., totalizing at about 9,500 ha. The bioclimate study was realized through climatic data survey. The absence of meteorological station in the Conservation Unit lead us to use of a model of linear regression equation for calculating the mean temperature. For this procedure there were used information of altitude, latitude and longitude of existent pluviometric stations in neighbors municipalities, as well as the others that make part of Xingà Ecological Station, for estimating the annual and monthly mean temperature. With the month values of temperature and pluviosity, graphic were constructed and obtained the biologically dry period in each station. From these data, using interpolation method, there were determined the isolines that permitted the construction of a bioclimatic map. With the results, it was possible to establish a relationship between pedo-landscapes and bioclimate. The next step constituted the classification of landscape. The investigated elements, with the purpose of knowing it, were the geological (tectonic and lithology), relieve and soils. The geomorphological compartmentation was the adopted methodology for individualizing the spaces, with the objective of characterizing them as geo-environmental units with distinct lithology, relieve and soils. In the third and last step was realized a phyto-physiognomic study through soil classes. These classes were delimited from the data previously obtained in this research. Thus, it was possible to correlating them with the other physical factors of the environment. In this phase, it was introduced the biotic element â vegetation â and, through limiting parcels with distinct pedologic classes, their variation were achieved. Since laboratory analyses, the soils revealed to be distinct in relation to their chemical-pedological content, despite of their similar physical characteristics. These results, plus the quantification of woody specimens in the studied areas, allowed explaining the variation of species responsible for distinction in the physiognomic composition of vegetation

ASSUNTO(S)

xingà solos phytophysiognomy xingà caatinga caatinga soils fitofisionomia geografia

ACESSO AO ARTIGO

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