104.
Detailed soil erosion studies bene?t from the ability to quantify the magnitude of erosion over time scales appropriate to the process. An inventory balance for
7Be was used to calculate sediment erosion in a 30·73 m
2 plot during a series of runoff‐producing thunderstorms occurring over three days at the Deep Loess Research Station in Treynor, Iowa, USA. The inventory balance included determination of the pre‐ and post‐storm
7Be inventories in the soil, the atmospheric in?ux of
7Be during the event, and pro?les of the
7Be activity in the soil following the atmospheric deposition. The erosion calculated in the plot using the
7Be inventory balance was 0·058 g cm
?2, which is 23 per cent of the annual average erosion determined using
137Cs inventories. The calculated erosion from the mass balance is similar to the 0·059 g cm
?2 of erosion estimated from the amount of sediment collected at the outlet of the 6 ha ?eld during the study period and the delivery ratio (0·64). The inventory balance of
7Be provides a new means for evaluating soil erosion over the time period most relevant to quantifying the prediction of erosion from runoff. Copyright © 2003 John Wiley & Sons, Ltd.
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