A STUDY OF SEDIMENT DELIVERY FROM A SMALL CATCHMENT IN THE LOESS PLATEAU BY THE CS-137 METHOD

A man-made tracer for soil erosion exists in the world-wide fallout of 137 Cs from nuclear test. Most of the fallout occurred from 1956 through 1965 with maximum deposition rates in 1963—1964. Reiatively little 137 Cs has been deposited since 1970. Cesium-137 is strongly adsorbed within the upper horizons of soil and resists leaching through soil. Since 137 Cs has a half-life of 30 a, it is a good tracer for long-term soil particle movement.  更多 还原