DOI: 10.5593/SGEM2014/B32/S13.006


M. Fer, R.Kodesova, A. Klement
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-14-8 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 2, 37-44 pp

The aim of this work was to describe an impact of erosion and deposition processes on soil properties and consequently on a microbial activity and CO2 emission. Study was performed on morphologically diverse study site in loess region of Southern Moravia, Czech Republic. The original soil type was Haplic Chernozem, which was due to erosion changed into Regosol (steep parts) and Colluvial soil (base slope and the tributary valley). The grab soil samples were taken from topsoil at 5 locations of the selected elevation transect and also from the parent material (loess). The basic soil properties were measured in the laboratory: pHKCl, pHH2O particle size distribution, oxidable organic carbon content, carbonates content and electric conductivity. Bulk density, porosity and soil particle density were also determined. Colony-forming units per gram of dry soil (CFU) were analyzed. Wet and also dry soil samples were measured 24 hours in the laboratory using the LCi-SD portable photosynthesis system with soil respiration chamber. The maximal net CO2 exchange rate (NCER), average NCER between 11:00 to 16:00 o’clock and NCER at 19:00 o’clock were evaluated. The net H2O exchange rates were also assessed. In general, the microbial activity and soil respiration increased with increasing organic matter content, salinity and particle density. The largest values of CFU were measured on topsoil at the upper part of the transect, which was only slightly impacted by erosion. The lowest values of the microbial activity and soil respiration characteristics were obtained on topsoil at the steepest and heavily eroded parts of the transect and on the parent material. Results showed close correlation between the CFU and following soil properties: salinity (R=0.90), pHKCl (R=-0.97), pHH2O (R=-0.95), oxidable organic carbon content (R=0.96), carbonates (R=-0,89), clay content (R=-0,91) soil particle density (R=-0.90), bulk density (R=-0.94) and porosity (R=0.94). Similar correlations were found between soil respiration´s characteristics on wet soil samples and soil characteristics. Close correlations were found also between CFU and maximal NCER (R=0,84) or average NCER (R=0,94) measured on wet soil samples. Results show that microbial potential expressed using colony forming units (CFU) and soil respiration characteristics could be used as an indicators of soil degradation due to erosion.

Keywords: soil respiration, microbial activity, soil erosion

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