都江堰地区──横断山北段生物多样性交汇、分化和存留的枢纽地段

都江堰地区位于四川盆地西缘山地、西藏高原向成都平原的过渡，位置特殊，是大尺度复合性的生态过渡中地理要素在此交汇过渡。气候处于中亚热带，植被基带为 阔叶林。由于气候温润，加上地形崎岖，岭谷相同，物种交汇，分化强烈，境内最高山光光山海拔４５８２ｍ，高于附近平源３８８０ｍ，植被垂直带谱清晰完整，是横断山北段生物多样性保护关键区的代表。

The Dujiangyan Region--Pivot sector of assemblage, differentiation and maintenance of biodiversity in northern part of Hengduan Mountain

Dujiangyan Region is located on the western border mountains of Sichuan Basin, the transition belt from Qingzang Plateau to Chengdu plain. Its particular position makes it a part of the large scale, composite ecotone of China, and various geographical elements assemblage and transit here. Climatically,it lies in the middle subtropical zone,and the basic belt of vegetation is evergreen broad leaved forests. Because of the warm and moist climate and the rugged topography with alternating high mountains and deep valleys, it is the place with strong assemblage and defferentiation of biotic species. The Guang guang Mountain, the highest peak within this region with an elvation of 4582m, 3880m higher than the nearby plain, the vertical belts of vegetation is distinct and perfect and represents the northern part of Hengduan Mountainthe second critical regions for biodiversity;conservation in China.