中文摘要：

地表剥蚀速率是衡量地貌演变的一个重要因子。本研究利用原地生成宇宙成因核素^10Be对青藏高原东南部地区地表岩石剥蚀速率进行了首次测定。结果显示,自末次间冰期以来,青藏高原东南部地区的地表岩石剥蚀速率不超过60mm/ka,平均剥蚀速率值约为27.1±10.2mm/ka,这一结果与其他高海拔地区基岩剥蚀速率值一致。高原东南部地区地表岩石剥蚀率同时受构造活动和气候尤其降水量等因素的制约。与高原内部干旱、半干旱地区相比,青藏高原东南部地区的剥蚀速率偏大,但均在同一个数量级范围内。高原东南部地区较高原内部干旱区剥蚀速率大的原因主要是由于降水量的差异所致。

英文摘要：

Surface erosion rate is an important subject in evaluating geomorphic evolution of landforms. In-situ cosmogenic radionuclide ^10Be was used to estimate the erosion rate in the southeastern Tibetan Plateau, where the precipitation is much higher than that in the central Tibetan Plateau. The determined erosion rates of 〈60 mm/ka （with a mean value of 27.1±10.2 mm/ka） are comparable with the erosion rates in other mountainous regions. Compared with the ersion rates in the central Tihetan Plateau, the erosion rates in the southeastern Plateau are higher, which could be due to the difference in precipitation. Both tectonic uplift and climate （especially precipitation） affect the erosion of landforms in the southeastern Tibetan Plateau.