Abstract: Tree-ring width standardized chronology (STD) was created by Sabina przewalskii Kom which collected in Xueshan Township of Qinghai Province. Analyzing the correlation between STD and climate factors of 4 meteorological stations in the source region of Yellow River. The results showed that STD was significantly correlated with maximum air temperature of the whole area in May-June and the correlation coefficient was -0.65. According to the results above, the maximum air temperature anomalies sequence in May-June of Yellow River source region during 1618-2009 was reconstructed. The reconstructed function embodied a certain degree of reliability and stability after level-one-out test and the explain variance reached 42.2%. There were 8 warm periods and 8 cold periods in the reconstructed maximum air temperature sequence over the past 400 years. Warm periods included 1644-1656, 1727-1746, 1786-1797, 1817-1835, 1860-1885, 1916-1934, 1952-1968 and 1992-2005, while cold periods contained 1632-1643, 1657-1696, 1747-1764, 1798-1816, 1836-1859, 1898-1915, 1935-1951 and 1969-1991. Comparing the reconstructed sequence in this study with temperature series reconstructed in Zadoi, on northeastern Tibetan Plateau and in the source region of Yangtze River, their trends were basically the same in common years. In addition, the reliability of this reconstructed sequence could be confirmed by some documents and historical records.

Key words: tree-ring, source region of Yellow River, climate reconstruction, maximum air temperature