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Partitioning the Contributions of Sheet and Rill Erosion Using Beryllium-7 and Cesium-137

^a State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi, China 712100
^b Department of Geography, University of Exeter, Amory Building, Rennes Drive, Exeter EX4 4RJ, UK

View larger version (27K): [in a new window]   Fig. 1. Location of the study area.

View larger version (18K): [in a new window]   Fig. 2. Typical Be-7 and Cs-137 depth distributions in uncultivated (a, c) and cultivated (b, d) soils in western Europe.

View larger version (12K): [in a new window]   Fig. 3. The vertical distributions of Be-7 activity in soils representative of the cultivated (a) and uncultivated (b) plots. The exponential depth distributions described by Eq. [2] and [3] have been superimposed on the vertical distributions of Be-7 activity.

View larger version (11K): [in a new window]   Fig. 4. The vertical distributions of Cs-137 activity in soils representative of the cultivated (a) and uncultivated (b) plots. The depth distribution described by Eq. [10] has been superimposed on (b).

View larger version (11K): [in a new window]   Fig. 5. A comparison of the range of the grain size distributions of sediment discharged from the cultivated (a) and uncultivated (b) plots during the simulated rainfall events with the mean grain size distribution of the surface soil within the individual plots.

View larger version (13K): [in a new window]   Fig. 6. A comparison of the range of the grain size distributions of sediment discharged from the cultivated (a) and uncultivated (b) plots before and after the initiation of rill development.

View larger version (13K): [in a new window]   Fig. 7. Variation of the Be-7 and Cs-137 activity of the sediment eroded from the cultivated plot during the simulated erosion event. The error bars represent the precision of the spectrometry measurements at the 95% level of confidence.

View larger version (12K): [in a new window]   Fig. 8. Variation of the Be-7 and Cs-137 activity of the sediment eroded from the uncultivated plot during the simulated erosion event. The error bars represent the precision of the spectrometry measurements at the 95% level of confidence.

View larger version (32K): [in a new window]   Fig. 9. The mobilization of sediment by sheet and rill erosion during the course of the simulated erosion event on the cultivated plot.

View larger version (13K): [in a new window]   Fig. 10. The relationship between changes in the grain size composition and organic C content of sediment mobilized during the simulated rainfall event on the uncultivated plot and changes in the relative importance of sheet and rill erosion during the event.

View larger version (14K): [in a new window]   Fig. 11. The relationship between changes in the grain size composition and organic C content of sediment mobilized during the simulated rainfall event on the cultivated plot and changes in the relative importance of sheet and rill erosion during the event.