Tracing Soil Particle Movement with Fe-591
- David D. Wooldridge2
Rates and patterns of actual soil particle movement were established by measuring changes in radiation intensity with time on an eroding sandstone soil. Applying 300 µc of Fe59 in a 5-foot line along the contour gave a better measure of soil erosion pattern than 100 µc applied to a point. More than 70% of the isotope applied moved 3 or more inches downslope from the line of application. Apparently Fe59 forms mainly stable precipitates or reacts with existing ferric compounds on clay and silt particles because it is not found in the soil solution or on the soil base-exchange capacity. Only 20% of the Fe59 was temoved by 72-hour treatment with 30% H2O2. Over 90% of the Fe59 was retained in the surface 1 cm of soil.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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