DBPapers
DOI: 10.5593/SGEM2015/B32/S13.038

RESEARCH OF SOIL AIR REGIME IN A CLAYEY-LOAM SOIL

R.I. Teodorescu, P. Voicu, D. Raducu, V. Tudor, A. Asanica
Thursday 24 September 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-37-7 / ISSN 1314-2704, June 18-24, 2015, Book3 Vol. 2, 279-286 pp

ABSTRACT
The air permeability has been sporadically studied in Romania, even if its data are useful in the characterization of soil pores. The paper emphasize the study of the physical processes involved in air regime of a clayey-loam soil, the factors that determined its aeration status, as well as the influence of biological activity on soil aeration. The researchers were performed in Marculesti area, located in the southern part of Romania. The soil is a clayey-loam Cambic Chernozem, formed in loess like deposits. The bioclimatic zone is steppe, while the climate is temperate continental, with an average annual temperature of 10.6°C and an average annual precipitation of 480 mm. The soil was sampled in autumn, after harvesting and crop transportation, when soil compaction is very high, in cylinders (235.6 cm3) from the three depth of the upper part of the soil (0 - 50 cm) representing the active rooting zone. The data showed that, the air regime of the studied soil was evaluated by the aim of the two indicators of the air content: the limit of aeration (LA) and the index of aeration deficiency (Ida): the values obtained for the studied soil showed an optimum LA for the all studied horizons; the values obtained for Ida were negative, pointing out the fully satisfactory aeration of the studied soil. The air permeability measurements showed high values throughout the studied soil profile, especially in the lower Am horizon, unaffected by tillage. The data of the image analysis of the pore distribution, characterized by their shape and size, showed the higher value 0.25 m2m-2 in the deeper Am horizon and the lower one in the more compacted Apt horizon, 0.14 m2m-2. The micromorphological observations on soil thin sections pointed out the dominance of the porosity generated by soil macro- and mezofauna (more preserved in Am and more collapsed and integrated in Ap and Apt soil matrix, under compacted processes). The air regime of the soil was influenced by the biological activity, which improved pore volume and generated continuous pores. The high values of permeability for air may also be due to the increased numbers of cracks, which created preferential paths of water and air circulation.

Keywords: air regime, soil, micromorphology

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