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甘肃省中部是东亚夏季风活动边缘带,也是我国北方环境敏感带,降水是制约当地农业社会发展的重要因素,因此对该区域过去降水变化开展研究有重要意义。本文在甘肃中部渭源县竺尼山采集油松树轮样本,建立了STD和RES年表。计算表明,RES年表与上年8月到当年7月的年降水总量相关最高(r=0.59),二者存在比较一致的变化趋势,因此竺尼山RES年表可以代表当地过去降水的变化信息,它与同处于东亚季风边缘带的兴隆山和吐鲁沟的树轮年表(也被用来重建了当地的年降水变化)显著相关。三个地点树轮宽度变化一致,树木径向生长均受控于降水。
The central Gansu Province is the marginal zone of East Asian summer monsoon activity and also an environmentally sensitive zone in northern China. Precipitation is an important factor that restricts the development of local agricultural society. Therefore, it is of great significance to study the past precipitation changes in the region. In this paper, a sample of Pinus tabulaeformis was collected in Zhuoni Mountain, Weiyuan County, central Gansu. The STD and RES chronology was established. The calculation shows that the RES chronology has the highest correlation with the total annual precipitation from August of the previous year to July of that year (r = 0.59), and there is a consistent trend of change between them. Therefore, The change information is significantly related to the tree-ring chronology (also used to reconstruct the local annual precipitation changes) of Xinglong Mountain and the Turpan-Lugou, which are located in the marginal zone of the East Asian monsoon. The change of tree wheel width in the three locations was consistent, and the radial growth of trees was controlled by precipitation.