7 research outputs found

    Surface erosion assessment using 137 Cs: examples from New Zealand

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    The 137Cs technique has provided the first quantitative, medium-term data on rates of soil redistribution by surface erosion on both cropland and rangeland in New Zealand. Use of the technique has demonstrated: high rates of soil redistribution by water erosion at two cropland sites under intensive vegetable production; a slow rate of net loss of soil by wind erosion associated with arable farming; a strong association between vegetation depletion and wind erosion on grazed rangeland. Research has also provided data on natural short-range variability of 137Cs in uneroded soils, and a technique for independently estimating 137Cs reference values from rainfall. The greatest research need remains the development of robust, accurate calibration procedures for conve rting 137Cs measurements to rates of erosion

    Surface erosion assessment using 137Cs: examples from Nez Zealand

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