以树轮宽度重建秦岭中段分水岭地区1—7月平均气温

Reconstructed Mean Air Temperature from January to July at the Divide Sampling Site in the Mid-Qinling Mountains with Tree-Ring Widths

根据秦岭中段分水岭地区秦岭落叶松树轮宽度指标,建立了该地区1814—2003年的树轮标准化年表。分析表明,该地标准化年表与当年1—7月平均气温显著相关。在此基础上设计转换方程,利用多元回归技术重建了秦岭中段分水岭地区的1—7月平均气温,重建序列的方差解释量为41.2%(F=15.062,p<0.0001),重建序列显示在过去190a中气温较低的时段主要有1814—1850年和1876—1889年;偏暖期主要有1851—1875年和1890—1933年;而1934—1990年这一时期气温变化幅度较小,气温相对比较稳定;1990年之后升温明显。

A tree-ring width chronology has been built from Larix chinensis at the divide sampling site in the mid- Qinling Mountains from 1814 to 2003. The calculation results show that standardization （STD） chronology was significantly correlated with the mean air temperature from January to July. The mean January-July temperature at the sampling site was reconstructed by using the multiple regression method, and the explained variance of the function was 41% （F=15.062,p〈0.0001）. Two cold periods in the past 190 years were found in 1814-1850, and 1876 1889, and two warm periods from 1851-1875, and 1890-1933, respectively. The reconstructed temperature was relatively stable from the early 1930s to 1990, but increased quickly after 1990.