中文摘要：

水土保持效益评价是提升水土保持技术和水土保持生态建设科学决策的前提。核素示踪技术能够直接测定特定时间段的土壤净侵蚀量,提供独立的土壤侵蚀和堆积数据以及空间分布的信息,是评价土壤侵蚀和泥沙来源的简便、快捷和高效的技术方法。利用环境核素^210Pb,^137Cs和^7Be示踪技术测定不同时间尺度的土壤侵蚀强度,探讨了在无常规水文泥沙监测资料情况下,水土保持效益多核素联合示踪评价的方法和计算模型。

英文摘要：

Assessing the benefits of soil and water conservation aims at promoting conservation technology and providing a decision-making basis for eco-construction. Tracing technique by environmental radionuclide can directly determine the net soil erosion within a certain period, and provide information on soil erosion and sedimentation and thire distribution. Therefore, it is a good way for soil erosion assessment. This study tries to use ^137 Cs, ^210 Pb and ^7Be to trace soil erosion at different time scales, and proposes corresponding calculating formulas.