兴安落叶松树干形成层温度变化特征及对主要环境因子的响应

The Characteristics of Temperature Variation in Stem Cambium of Larix gmelini and its Response to Environmental Factors

从2005年9月15日至2006年9月15日对寒温带兴安落叶松原始林树干形成层温度及主要影响因子进行了连续观测。结果表明：兴安落叶松树干形成层具有良好的耐低温性，能够耐-40℃以下的低温，并始终保持自身温度变化的稳定，日温差始终保持在5℃左右；树干形成层的温度变化主要受林内温度的影响，其月平均温度与林内月平均温度的相关关系为y=1．0202x—1．2641（R^2=0．9971）；同时与0～40cm根系分布层土壤温度有密切的相关关系；兴安落叶松原始林林内风速基本处于软风状态，与树干形成层的温度没有显著的联系，有利于树干形成层生命活力的保持。这一研究可为寒温带兴安落叶松林对气候变化的响应提供科学依据。

The temperature in stem cambium of Larix gmelini and its main impact factors were observed in Greater Xingan Mountains from Sep 15, 2005 to Sep 15, 2006. The result showed that stem cambium of ~ gmelini had great frost resistance and could maintain stable temperature variation under very low temperature which was below - 40℃, and its daily temperature differerw.e was about 5℃. The temperature in stem cambium of Larix gmelini was mainly affected by the temperature within forest, and the relationship between the average temperature in stem cambium of Larix gmelini and in forest was： y = 1.0202x - 1.2641 （R^2 = 0.9971）. Also it had close correlationship with the temperature of soil with root distribution. However, the variation of wind velocity within forest was small, and did not have close correlatlonship with the temperature in stem cambium, thus it was conducive to the productivity maintaining in stem cambium. This paper could provide scientific basis for further researches on respense and adaptation of Larix gmelini ecosystem to climate change.