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Measurement of soil macropore geometry by image analysis of sections through impregnated soil

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Abstract

The geometry of the soil pore space affects root growth directly by providing pathways for root extension and indirectly through its effects on soil aeration and on water infiltration, redistribution and drainage. Image analysis of sections through impregnated blocks of undisturbed soil allows quantitative assessment of the pore space. Samples are dehydrated and impregnated with resin containing a fluorescent dye. Once the resin has hardened, the blocks can be cut to reveal a section through the structure. An image of the pore space, which is now filled with resin, can be obtained using ultra-violet light either photographically or digitally. Digital images are segmented into pore space and solid. Image analysis techniques can be used to classify the pore space into channels, fissures and packing pores. This allows appropriate measurements to be made on each class so that stereology can be used to estimate 3-D parameters from the measurements made on the image. Various indices can also be derived to quantify the pore structure.

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  1. CSIRO Division of Soils, GPO Box 639, 2601, Canberra, ACT, Australia

    Anthony J. Ringrose-Voase

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Ringrose-Voase, A.J. Measurement of soil macropore geometry by image analysis of sections through impregnated soil. Plant Soil 183, 27–47 (1996). https://doi.org/10.1007/BF02185563

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