This study was carried out to obtain a representative set of data on long-term erosion rates from a pilot area located close
to the Jaslovske Bohunice village, in western Slovakia using the 137Cs-method. The study area chosen was representative of
the hilly loess cultivated areas of Slovakia. The sampling strategy was based on a multiple transect approach. Analyses of the
samples for 137Cs activity were made at the Nuclear Power Plant Research Institute, Jaslovske Bohunice. 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 were closely related to major landforms. The 137Cs inventories were considerably lower on
the slopes than on the plateau and they were 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.
Three conversion models, i.e. the proportional model (PM), the simplified mass balance model (MBM1) and the standard
mass balance model (MBM2), from the set of models developed at Exeter University, Great Britain were selected to interpret
the resulting 137Cs measurements into soil erosion/deposition rates. The mean erosion rates estimated with the PM were 22.4,
35.6 with MBM1 and 17.3 t ha−1 per year with MBM2. There was a good agreement between the average of these mean
erosion rates (25.1 t ha−1 per year) for the Jaslovske Bohunice site and the estimated mean soil erosion rate obtained for small
erosion plots (15 t ha−1 per year) for conditions similar to the study site. Nevertheless, further research on the application of
the 137Cs-method, in particular the independent validation of the results obtained, is needed. Several issues requiring further
study have been highlighted.
This study was carried out to obtain a representative set of data on long-term erosion rates from a pilot area located closeto the Jaslovske Bohunice village, in western Slovakia using the 137Cs-method. The study area chosen was representative ofthe hilly loess cultivated areas of Slovakia. The sampling strategy was based on a multiple transect approach. Analyses of thesamples for 137Cs activity were made at the Nuclear Power Plant Research Institute, Jaslovske Bohunice. The 137Cs-methodwas used to obtain long-term estimates of soil erosion in the Jaslovske Bohunice site, a representative hilly loess cultivatedarea 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 individualtransects the 137Cs inventories were closely related to major landforms. The 137Cs inventories were considerably lower onthe slopes than on the plateau and they were highest in the valley. However, when plotted against a selection of individualquantitative slope parameters, i.e. the S and the LS factors of the USLE or slope inclination, the correlations obtained wereweak.Three conversion models, i.e. the proportional model (PM), the simplified mass balance model (MBM1) and the standardmass balance model (MBM2), from the set of models developed at Exeter University, Great Britain were selected to interpretthe resulting 137Cs measurements into soil erosion/deposition rates. The mean erosion rates estimated with the PM were 22.4,35.6 with MBM1 and 17.3 t ha−1 per year with MBM2. There was a good agreement between the average of these meanerosion rates (25.1 t ha−1 per year) for the Jaslovske Bohunice site and the estimated mean soil erosion rate obtained for smallerosion plots (15 t ha−1 per year) for conditions similar to the study site. Nevertheless, further research on the application ofthe 137Cs-method, in particular the independent validation of the results obtained, is needed. Several issues requiring furtherstudy have been highlighted.
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