【摘要】 不合理的开发和利用所导致植被覆盖的破坏严重 ,致使红砂岩母质地区长期以来遭受到强烈的土壤侵蚀。采用 1 37Cs技术 ,研究红砂岩发育的红壤典型小流域的土壤侵蚀作用。结果表明 :该流域的 1 37Cs基准值为 2 0 14 Bqm- 2 ;对于非耕作土壤而言 ,1 37Cs在土壤剖面中呈峰值型分布 ,最大分布深度约为 15 cm;对于耕作土壤而言 ,则在耕作层内呈均一分布 ,耕作层以下则急剧下降。典型断面研究表明 ,上坡部坡耕地的侵蚀作用强于下坡部 ,且山顶面积较小的耕地的侵蚀作用比面积较大的坡顶耕地要大。总体而言 ,坡耕地的流失是相当严重的更多还原

【Abstract】 The destruction of vegetational cover in the region developed from red sandstone results in severe soil erosion. 137 Cs technique was used to investigate soil erosion occurred within a small catchment developed from red sandstone. The local 137 Cs reference inventory was determinated to be 2 014 Bq m -2 . 137 Cs exhibits peak vertical distribution in uncultivated soils, with a maximum vertical distribution depth less than 15 cm. However, it is uniformly distributed within the plough layer, and decreases sharply in activity below the plough layer. Typical transects case study shows that soil erosion rates on the upper sloping farmland is usually higher than that on the lower sloping farmland, and soil loss from cultivated land on the crest with a relatively small total area is usually higher than that with a relatively large total area. Generally, soil erosion on the sloping farmland is severe.更多还原