Toposequences of soils developed on basaltic rocks: physicochemical attributes

• Autor(a) principal: Gonçalves, Marcos Aparecido
• Data de Publicação: 2013
• Outros Autores: Tavares Filho, João, Vendrame, Pedro Rodolfo Siqueira, Telles, Tiago Santos
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista de Ciências Agrárias (Belém. Online)
• Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/848

Soils are formed in a structural continuity of layers along a toposequence. The objective of this study was to characterize the chemical and physical properties of soils in two topossequences derived from basaltic rocks in the state of Parana, with different slopes, aiming to identify the relationships between their attributes, relief, and parent material. We studied two toposequences, with differentiated reliefs, developed on parent material consisting of vesicular and aphanitic basaltic rocks. The following physical properties were evaluated: texture, bulk density, particle density, macroporosity, microporosity, aggregate stability in water, degree of dispersion, and degree of flocculation. Chemical analyses were carried out for determination of Ca, Mg, K, P, Al, H+Al, C, and ΔpH. The results were submitted to principal component analysis (PCA) to obtain the correlation circles. In the circle of eigenvectors, in the slope with soft undulating relief, most vectors are located in the negative sector, both for physical and chemical properties with the latter being closer together. Also, the relationships between Ca, Mg, K and aluminum are evident. This way, chemical and physical properties are listed in the two slopes, and the level of correlation depends on the existing interactions. In addition, young soils with different characteristics and behavior were different from the others. Effective depth and structure were limiting attributes, but other favorable attributes were observed. The relationships among the attributes are differentiated along the slopes, and are influenced by the physicochemical nature of the geological substrate.