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Solid Earth An interactive open-access journal of the European Geosciences Union

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doi:10.5194/sed-7-2011-2015
© Author(s) 2015. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
30 Jul 2015
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This discussion paper has been under review for the journal Solid Earth (SE). The revised manuscript was not accepted.
Effects of soil depth on the dynamics of selected soil properties among the highlands resources of Northeast Wollega, Ethiopia: are these sign of degradation?
A. Adugna1,2 and A. Abegaz1 1Department of Geography and Environmental Studies, Addis Ababa University, Addis Ababa, Ethiopia
2Department of Geography and Environmental Studies, Wolaita Sodo University, Addis Ababa, Ethiopia
Abstract. This study was conducted with an aim to analyze the spatial variability of soil properties with depth under four prominent land use patterns viz., forestland, grazing land, cultivated land and bush land of Northeast Wollega. Soil samples were collected from the land uses at two depths (0–15 and 15–30 cm) in replicates and totally 40 composite soil samples were collected. Statistical analysis revealed significant variation in soil properties with along the selected land uses. Topsoil layer had significantly greater OM, TN, AP, sand, silt, Mg2+, K+ and Mg2+ concentrations than the subsoil layers. However, clay under all land uses and CEC under bush land and grazing land revealed reverse trends. Organic matter and CEC have stronger correlations with most of soil properties in the topsoil than in the subsoil while clay has no significant correlation with selected soil properties except with sand fraction in the sampled depths. Hence, the correlation among the selected soil properties also varies with soil depth. In general, the spatial variability of soil properties indicates that they were strongly affected by external factors (agricultural treatments and soil management practices) and internal factors (soil type and depth).

Citation: Adugna, A. and Abegaz, A.: Effects of soil depth on the dynamics of selected soil properties among the highlands resources of Northeast Wollega, Ethiopia: are these sign of degradation?, Solid Earth Discuss., 7, 2011-2035, doi:10.5194/sed-7-2011-2015, 2015.
A. Adugna and A. Abegaz
A. Adugna and A. Abegaz
A. Adugna and A. Abegaz

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Most of selected soil properties showed highest variation with depth under forestland and lowest under cropland. There were no consistent spatial trends in CEC. The correlation matrix suggests OM, CEC and Ca are fundamental soil properties in both sampled depths. The Correlations among soil properties are determined by soil-forming processes than parent materials. However, it is difficult to explain on which sampled depths that correlation between soil properties would be stronger.
Most of selected soil properties showed highest variation with depth under forestland and lowest...
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