Soil erosion evaluation in a small basin through the use of Cs technique |
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Authors: | Alfonso Bujan Oscar J Santanatoglia Celio Chagas Marcelo Massobrio Mario Castiglioni Marta Yaez Hugo Ciallella Jorge Fernandez |
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Institution: | a CNEA, Av. del Libertador 8250, 1429, Buenos Aires, Argentina;b Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martin 4453, 1417, Buenos Aires, Argentina;c Autoridad Regulatoria Nuclear, Av. del Libertador 8250, 1429, Buenos Aires, Argentina |
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Abstract: | Soil erosion significantly affects the most productive lands in Argentina, particularly the region called “Pampa Ondulada”. Quantification of the actual rates and patterns of soil loss is necessary for designing efficient degradation control strategies. The aim of this investigation was to gather using the 137Cs technique a reliable set of data of erosion and sedimentation rates, in order to describe the long-term erosive landscape dynamic in a 300 ha basin representative for the “Pampa Ondulada” region of Argentina. The general topography of the basin is undulated with slopes gradients between 0 and 2.5% and slope lengths up to 800 m long. The main land use consisted in annual cropping under conventional tillage.For the soil erosion study in the basin the 137Cs technique was used, which is based on the comparison between the 137Cs inventories surveyed with a local reference 137Cs profile. The sampling strategy was based on a multiple transect approach.The estimated mean soil erosion rates obtained applying Mass Balance Model 2 for the studied hillslopes ranged between −11.5 and −36 t ha−1 per year and fitted the low and moderate erosion classes according to FAO. These values ranged beyond the admitted tolerance. Sedimentation was observed at the lower landscape positions probably related to changes from convex to concave slopes. The application of the 137Cs technique in the studied basin proved to be a useful and sensible tool for assessing erosion/deposition rates. In areas with low topographic gradients like the Pampa Ondulada region, the slope length appears to be an important property for predicting spatial patterns of erosion rates. |
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Keywords: | Basin Soil erosion Sedimentation 137Cs method Pampean Region |
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