新疆阿勒泰地区西伯利亚红松径向生长对气候水文的响应

利用采自新疆阿勒泰地区西伯利亚红松树轮样本,建立树轮标准化年表,对气候水文因子对西伯利亚红松径向生长的影响进行了研究。结果表明: 西伯利亚红松年表包含较高的气候信息,与当年5—6月平均温度、平均最高温度表现出显著的负相关,与当年5—6月帕默尔干旱指数(PDSI)表现出显著的正相关,与当年1—6月降水表现出显著的正相关,与上一年11月额尔齐斯河径流表现出明显的正相关。温度和降水共同影响该地区西伯利亚红松的径向生长,其中生长期前期降水与夏季温度是影响径向生长的关键气候要素。对年表极值年的研究发现,厄尔尼诺-南方振动(ENSO)及全球大尺度环流与西伯利亚红松径向生长存在联系,ENSO通过对中亚上空气旋位置的影响使输送到阿勒泰地区的水汽产生变化,从而影响到西伯利亚红松的径向生长。

Responses of radial growth of Pinus sibirica to climate and hydrology in Altay,Xinjiang, China

Based on a standardized tree-ring width chronology established at Altay, Xinjiang, we examined the climatic and hydrological factors affecting the tree-ring width of Pinus sibirica. The results showed that the tree-ring width chronology of P. sibirica was negatively correlated with the average temperature and the average maximum temperature in May-June of current year and positively correlated with May-June PDSI and January-June precipitation. The tree-ring width chronology of P. sibirica was positively correlated with previous November runoff of the Irtysh River. The radial growth of P. sibirica was affected by temperature and precipitation, with precipitation in early stage of tree growth and temperature in summer being the key climatic factors. The study of the extreme years of chronology showed that the radial growth of P. sibirica was related to ENSO events and global large-scale circulations. By affecting the location of cyclones over Central Asia, ENSO affected water vapor transport to Altay, with consequences on the radial growth of P. sibirica.