THREE DIMENSIONAL CHARACTERIZATION OF SOIL MACROPOROSITY BY X-RAY MICROTOMOGRAPHY

Revista Brasileira de Ciência do Solo

Sabrina Passoni¹  Luiz Fernando Pires¹  Richard Heck¹  Jadir Aparecido Rosa¹ 

关键词: soil structure;    pore size distribution;    soil porosity;    image analysis;    soil microstructural components;    estrutura do solo;    distribuição do tamanho de poros;    porosidade do solo;    análise de imagens;    componentes microestruturais do solo;   

DOI  :  10.1590/01000683rbcs20140360

来源: SciELO

【 摘 要 】

Analysis of the soil pore system represents an important way of characterizing soil structure. Properties such as the shape and number of pores can be determined through soil pore evaluations. This study presents a three-dimensional (3D) characterization of the shape and number of pores of a sub-tropical soil. To do so, a second generation X-ray microtomograph equipped with a plain type detector was employed. A voltage of 120 kV and current of 80 mA was applied to the X-ray tube. The soil samples analyzed were collected at three different depths (0-10, 10-20, and 20-30 cm). The results obtained allowed qualitative (images) and quantitative (3D) analyses of the soil structure, revealing the potential of the microtomographic technique, as well as the study of differences in soil macroporosity at different depths. Macroporosity was 5.14 % in the 0-10 cm layer, 5.10 % in the 10-20 cm layer, and 6.64 % in the 20-30 cm layer. The macroporosity of unclassified pores (UN) was 0.30 % (0-10 and 10-20 cm) and 0.40 % (20-30 cm), while equant pores (EQ) had values of 0.01 % at the three depths under analysis.

【 授权许可】

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