中文摘要：

位于青藏高原东南缘红河断裂带西南侧的哀牢山山脉,受高原东南缘倾斜扩散地势的影响,从东北至西南,地形逐渐由高海拔夷平面的幼年期经壮年期进入老年期,是戴维斯地貌演化模型转换体现在延续的空间中难得的实例.本文基于ASTER-GDEM数字高程模型,沿红河断裂带提取了哀牢山的88个流域及宽约10km的条带剖面,通过对流域的面积-高程积分值、高程、起伏、面积、坡度、水系密度以及裂点的分析,验证了从苴力-元江段、元江-茅草坪段到茅草坪-安沛段,流域地形经幼年、壮年到老年期的连续、逐渐的变化过程,展现了戴维斯地貌侵蚀循环理论的具体演化特征.研究提取到的流域裂点呈双层带状分布,不仅揭示了夷平面的出现、延续和消失的过程,也暗示着构造抬升或者气候变化造成两阶段河谷下刻事件的发生.此外,研究结果表明哀牢山流域水系从幼年期、壮年期到老年期,水系密度经历了从低到高再变低的过程,反映了与戴维斯演化过程相对应的水系演化过程的规律.研究扩展了对区域地貌演化过程以及对经典地貌演化理论的认识,同时也为青藏高原东南缘隆升扩展过程的研究提供重要的地貌学依据.

英文摘要：

The Ailao Shan is a mountain range extending from SE Tibet to the South China sea along the Red River fault. Conforming to the gently dipping of the SE Tibet, the topography sequentially developed from the ＂youth＂, and the ＂maturity＂ to the ＂old age＂ stages, which is a rare instance of Davisian Landform Evolution Model presented in the continuous space. Based on ASTER-GDEM, we extracted and analyzed 88 watersheds and a 10-km wide swath profile of the Ailao Shan mountain range along the Red River fault. The landform processes were examined using the topographic features such as the hypsometric integral, elevation, relief, area, slope angle, drainage density and the distribution of knickpoints. From the Juli-Yuanjiang, Yuanjiang-Maocaoping to Maocaoping-Anpei sections, the landform processes gradually changed from ＂youth＂, and the ＂maturity＂ to the ＂old age＂ stages, demonstrating the detailed evolution features of the Davisian model. The study further objectively obtained two linear distributions of the knickpoints, which indicating the two-phase river incision caused by tectonic uplift or rapid climate change. The distribution of the upper-layer knickpoints, which below the planation surface further revealed the emergence, continuation and disappearance of the plateau planation surface. In addition, the result also showed the features of stream-net development, varied with high, low and high drainage density in response to stages of ＂ youth＂, ＂maturity＂ and ＂old age＂. This study is helpful for the better understand the landform evolution of this region as well as the Davisian landform evolution model.