秦岭通天河地区树轮年表的建立及特征分析

Establishment and Characteristic Analysis of Tree-Ring Chronologies of Tongtian River in Qinling Mountains

在秦岭通天河地区进行树木年轮样本采集工作的基础上建立了研究区183年的标准化树轮年表、差值树轮年表及自回归标准化树年轮表。其中标准化树轮年表具有较高的平均敏感度及相对较低的一阶自相关,表明年表能够反映气候变化信息。年表变化表明上年气候条件对当年树木生长会产生一定影响。在树轮年表记录的183年间,树木生长存在5个高值时段及5个低值时段,高生长时期所占时段显著长于低生长时期所占时段,极低生长值年份多于极高生长值年份。

With the tree ring samples of Tongtian River in Qinling Mountains collected,based on the samples,three kinds of chronologies(STD chronology,RES chronology and RES) were established for 183 years in the study area.The standardized tree-ring chronology has a high average sensitivity and a relatively low first-order autocorrelation,which means that the chronology can reflect climatic change information.The climatic conditions of the previous year have little impact on the growth of trees in that year.During the 183 years,there existing 5 high-value growth periods and 5 low-value growth periods,the period of high-growth period was significantly longer than that of low-growth period.The chronology also reflects that the years of extremely low growth value were more than the years of extremely high growth value.