长白山山杨年轮年表及其与气候变化的关系

摘要

以长白山自然保护区内设立面积为1 hm2的固定样地内山杨为主要研究对象,介绍了使用RESISTOGRAPH树木针测仪获取年轮宽度的过程,并使用COFECHA对获取的年轮宽度进行的交叉定年和控制检验.结果表明,获得的山杨宽度年表轮宽指数与该地区月平均气温达到显著相关(P＜0.05),生长季气温与树轮径向宽度正相关性显著,从而影响了山杨的生长,冬季低温则制约树木的生长,当年生长季前4月份的温度为树木萌发需要的积温提供基础;从山杨宽度年表轮宽指数与该地区月降水量的关系可看出,树木生长季的降水量对树木生长产生一定影响,其中上一年9月份由于降水的减少使其与树轮宽度表现出显著负相关,而秋冬季节降水量的增加可促进下一年树木径向生长.%Populus tremula in 1 hm2 fixed sample plot in the Changbai Mountain was investigated to describe the process of obtaining the width by using Rinntech RESISTOGRAPH,and test the cross dating and quality control of tree-ring measurements by COFECHA.The results indicate that the chronology index in the width of P.tremula has significant correlation with the average monthly temperature (P＜0.05).In the growing season,there is a strong positive correlation between the radial growth and temperature,and the temperature can influence the growth of P.tremula.But in winter the low temperature restricts the growth,while the temperature in April provides the necessary foundation in tree growth.Based on the relationship with the chronology index of the monthly precipitation,the amount of precipitation has some effect on the tree growth in the growing season.Especially in September,there is a strong negative correlation between the precipitation and the chronology index of the width because of the little rain in the month,while the precipitation in winter can promote the width growth.