The runoff and rainfall data of typical forested and non-forested watersheds in Ziwuling region,which is located in the hinterland of the Loess Plateau,were used to analyze their annual runoff variation comparatively. The result showed that the annual distribution of runoff in forested watersheds was uniform,compared with that in non-forested watersheds. The total runoff in flood season dereased by 8\^88 mm and 7\^1 mm. Regression analyses between runoff in dried-up season and rainfall in flood season or in...
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