中文摘要：

利用^7Be示踪方法，研究次降雨条件下浅沟集水区片蚀的空间分布特征．结果表明：次降雨发生前后，^7Be在浅沟集水区不同部位发生显著的空间分异，^7Be含量的差值随坡长整体上呈波动趋势，坡面上部在0～10m范围内侵蚀强度较弱，局部区域有沉积发生，在坡面中部坡长为45～50m左沟脊处土壤侵蚀相对严重，坡长大于75m的坡面下部，土壤侵蚀也较严重．

英文摘要：

In this paper, 7 Be was applied as a tracer to study spatial distribution difference of soil erosion in the ephemeral gully catchments under the individual rainfall event. The results show that the difference of 7 Be con- tent becomes significant after erosive rain event. As the hillslope length increases, the cumulative value of 7Be changes with the fluctuating trend. Spatial distribution characteristics of soil erosion are slight at upper slope where slope length is less than 10 m, and deposition happens in some areas. At downslope where slope legth is longer than 75 m, topsoil erosion is more severe. In addition, the rill erosion is more intensive at the near area of shallow gully channel. Generally, soil erosion intensity in ephemeral gully catchments increases with the increase of slope length.