根据树轮密度实验的基本原理,选取新疆最具代表性的针叶树种西伯利亚落叶松,设计出一套完整的树轮密度实验流程,对Dendro2003树轮密度分析系统的校正系数进行计算,得出落叶松校正系数为0.761。通过与单芯校正系数的比对,发现在大样本量的条件下,采用此校正系数对树轮密度值进行校正,产生的误差很小,并通过实验获取的密度数据,重建了一条温度序列,效果良好。对比瑞士联邦森林雪景观研究院(WSL)和中国气象局气候中心树轮研究室的树轮密度校正系数,发现两个实验室的校正系数区别较大,这可能是受到系统自身的光学性质和实验环境的影响,说明在正式实验前确定校正系数是必须的。通过对塔城东部的西伯利亚落叶松的树轮密度研究发现,塔城东部西伯利亚落叶松对春夏季最高温度具有良好的响应,并具有建立较长的温度序列的潜力。
According to the X-ray analysis principles of tree-ring density,we select the most representative species larch in Xinjiang to determine on the tree-ring density correction factor.The correction factor of Dendro-2003 tree-ring density analysis system of larch is 0.761.Compareing with the single correction factor,the error of result is small using the correction factors of two tree-ring density in the large sample size condition the.At the same time,compareing with tree-ring correction factor of Swiss Federal Institute for Forest,Snow and Landscape Research(WSL)and China national cliamte center(NCC),the correction factor of two laboratories is different,which may have been influenced by its own optical system and experimental environment.Determination the correction factor is necessary before Using Dendro2003 tree-ring density analysis system,and we also found that Dendro2003 tree-ring density system can reflect the density of wood objectively.In our study,we found that the Larix sibirica tree-ring density had a good response with the maximum temperature of the spring and summer in Tacheng,and had a potential to reconstruct a long climate series.