中文摘要：

利用树木年轮分析可以判定过去人类文化遗存的年代，对过去气候（包括温度、降水）和环境进行重建和研究，而且还能对碳十四年代进行校正。树轮年表越长，其利用潜力越大。因此我们必须尽可能建立能延伸到史前的树轮年表。

英文摘要：

The present paper reports a dendro-chronological study of the Przewalsk juniper （Sabina przewalskii Kom） specimens unearthed from Xiatatu tombs of the Tubo Kingdom in Guolimu Township, Delingha Prefecture, Qinghai Province. The research results include the establishment of a 2332-year dendro-archaeological chronology and the determination of the date of the excavated tombs. Thus we have got an exact calendar scale for inquiring into the culture and migration of the Tuyuhun Tribes in the Sui and the Southern and Northern Dynasties periods, as well as the Tuyuhun culture under the rule of Tubo, the history of the Tubo civilization and exchanges between ancient China and western countries. The long chronology provides highly exact dendro-chronological data for the reconstruction of the ancient climate in this region and a reliable environmental background for understanding the role of climate in the transformation of ancient Chinese social-economic formation.