The 137Cs-method was used to obtain long-term
estimates of soil erosion in the Jaslovske Bohunice
site, a representative hilly loess cultivated area of Slovakia.
The estimated reference 137Cs inventory was
2910 Bqm−2, with a coefficient of variation of 4.3%.
Examination of the 137Cs redistribution in relation
to the topography of the study area revealed that,
within individual transects the 137Cs inventories are
closely related to major landforms. The 137Cs inventories
are considerably lower on the slopes than on the
plateau and they are highest in the valley. However,
when plotted against a selection of individual quantitative
slope parameters, i.e. the S and the LS factors
of the USLE or slope inclination, the correlations obtained
were weak.
The mean erosion rates estimated utilizing three
conversion models were 22.4 t ha−1 per year for the
PM, 35.6 t ha−1 per year for MBM1 and 17.3 t ha−1
per year for the MBM2. There is reasonable agreement
between the average of the mean erosion rates
obtained by the 137Cs-method (25.1 t ha−1 per year)
and the mean soil erosion rate obtained for small plots.
Nevertheless, further research on the application of
the 137Cs-method, in particular the validation of the
results obtained, is needed. Several issues requiring
further study have been highlighted.
With the available 137Cs data and the resulting estimates
of soil erosion/deposition rates it was possible
to produce maps illustrating the spatial distribution of
137Cs inventories and a three-dimensional representation
of soil erosion/deposition within the study area.
The 137Cs-method was used to obtain long-termestimates of soil erosion in the Jaslovske Bohunicesite, a representative hilly loess cultivated area of Slovakia.The estimated reference 137Cs inventory was2910 Bqm−2, with a coefficient of variation of 4.3%.Examination of the 137Cs redistribution in relationto the topography of the study area revealed that,within individual transects the 137Cs inventories areclosely related to major landforms. The 137Cs inventoriesare considerably lower on the slopes than on theplateau and they are highest in the valley. However,when plotted against a selection of individual quantitativeslope parameters, i.e. the S and the LS factorsof the USLE or slope inclination, the correlations obtainedwere weak.The mean erosion rates estimated utilizing threeconversion models were 22.4 t ha−1 per year for thePM, 35.6 t ha−1 per year for MBM1 and 17.3 t ha−1per year for the MBM2. There is reasonable agreementbetween the average of the mean erosion ratesobtained by the 137Cs-method (25.1 t ha−1 per year)and the mean soil erosion rate obtained for small plots.Nevertheless, further research on the application ofthe 137Cs-method, in particular the validation of theresults obtained, is needed. Several issues requiringfurther study have been highlighted.With the available 137Cs data and the resulting estimatesof soil erosion/deposition rates it was possibleto produce maps illustrating the spatial distribution of137Cs inventories and a three-dimensional representationof soil erosion/deposition within the study area.
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