Soil & Water Res., 2023, 18(3):204-218 | DOI: 10.17221/105/2022-SWR

The effects of slope and altitude on soil organic carbon and clay content in different land-uses: A case study in the Czech RepublicOriginal Paper

Shahin Nozari*, Luboš Borůvka
Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food, and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic

Soil organic carbon (SOC) and clay, as indicators of soil fertility, are mainly used to determine the ability of soil to retain water and store the nutrients that are necessary for plant growth. However, the distribution of SOC and clay is influenced by topography and land-use. In the present study, the relationships between SOC, clay, altitude, and slope in the topsoil of two different districts in the Czech Republic including the Liberec (71 samples) and Domažlice (67 samples) districts were investigated. To analyse the relationships between slope and SOC, linear regression was used. Results showed that SOC content increased when slope, clay, or altitude increased; however, there were no significant correlations between SOC and clay in both districts. Clay increased with decreasing slope, but clay and altitude were not correlated well in both areas. Then, study areas were divided into three land-use types including arable land, forest, and complex system of agriculture, parcels, and forests. Consequently, the correlations between SOC and slope and clay and slope were generally improved, indicating the importance of land-use on SOC and clay content. Additionally, using multiple regression with several topographic factors can provide a better prediction of SOC and clay content in each land-use for both districts, indicating the complex effects of topography on SOC and clay.

Keywords: ANOVA; coefficient of determination; correlation coefficient; linear regression; multiple regression; SOC

Received: July 18, 2022; Accepted: August 3, 2023; Prepublished online: August 28, 2023; Published: August 31, 2023  Show citation

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Nozari S, Borůvka L. The effects of slope and altitude on soil organic carbon and clay content in different land-uses: A case study in the Czech Republic. Soil & Water Res.. 2023;18(3):204-218. doi: 10.17221/105/2022-SWR.
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