中文摘要：

任何区位的土地属性都存在分异和区别，由此形成了不同水平的建设用地适宜性。而交通设施规模及空间网络是影响土地属性与建设适宜性分异的重要因素。本文从宏观和微观两个尺度，构建了交通优势度的评价方法，宏观尺度侧重各类交通设施综合优势水平的总体评价、物理空间分析与大尺度分异特征。微观尺度采用栅格方法进行精细评价，注重地形高程和坡度等自然因素对交通优势度的修正影响，形成集人文与自然因素相结合的评价方法。然后，选择玉树地震灾区作为案例区，从地震影响区和重灾区两个空间层级，深入分析交通优势度的等级结构及空间分异。最后，根据交通优势度的分异性，分析各区位土地资源对人类社会活动的适宜性差异，尤其是充分考虑地形高程和坡度等自然因素，并以建设适宜性突出和明显的土地资源为主体，对建设适宜水平较高、空间连续且面积较大的区域进行划定，相对精准地勾勒出城镇建设、居民点选址及产业布局的适宜区位与范围。

英文摘要：

Each region has different spatial attributions and therefore different suitability for human construction. The scale and spatial network of transport infrastructure is an important factor in a region＇ s suitability for construction, and influences the selection of residential and industrial areas. Here, we construct a methodology to appraise regional transport dominance. At the macroscopic dimension, the methodology chiefly focuses on integrated regional dominance of various transport infrastructure （railway, road and airport）, physical spatial pattems and overall features. At the microscopic dimension this methodology applies a grid model to evaluate transport dominance and determine the physical factors （height and slope） influencing transport dominance. We use the Yushu earthquake region as our focal area, including the whole earthquake region and worst-hit area of Yushu county. We discuss the hierarchical structure and spatial differentiation of regional transport dominance and supporting capacity of transport infrastructures. Based on the spatial pattem of regional transport dominance, we further analyze differentiation of land suitability and delimit suitable regions for human socioeconomic activity. The results show that about one-tenth of land resources in Yushu County has high construction suitability and is suitable for human settlements and socioeconomic activity, but 75% of land resources have low suitability. We delimit accurately the spatial scope of the suitable region according to higher suitability, spatial continuum, and land area and identify five regions （Batang Beachland, Jiegu Town area, Longbao area, Shanglaxiu area, Xialaxiu area. However, Batang Beachland and Jiegu Town） that have the best spatial allocation of transportation, terrain height, slope, water resources and agriculture, and have the highest suitability to construct a city, town, residential center, and industrial park. The methodology presented here will increase the accuracy of transport dominance, and help to e