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利用采自太白山南坡药王殿、北坡上板寺的太白红杉树芯样品分别建立树轮宽度年表,运用Vaganov-Shashkin模型揭示秦岭太白红杉径向生长对各气候要素的响应.结果表明:生长季(4—8月)的温度、生长初期的降水量以及7、8月的降水量是限制秦岭地区太白红杉生长的主要气候因子.良好的温度条件有利于太白红杉的生长,但生长初期的降水量会抑制太白红杉的生长;7、8月的降水量对秦岭南坡和北坡太白红杉的影响差异明显,该时段内丰富的降水量对北坡太白红杉的生长具有促进作用,而对南坡太白红杉的生长产生一定的限制作用;同一坡向、不同海拔采样点树木径向生长与气候因子的响应结果同样存在差异,高海拔采样点太白红杉的生长需要的温度条件低于低海拔采样点,但对土壤湿度的需求大于低海拔采样点.生长开始日的早晚对太白红杉树轮宽度的形成影响很大,而生长结束日仅与南坡采样点树轮宽度之间呈显著相关.
The tree-ring chronology was established by using samples collected from the Yao royal temple on the southern slope of Taibai Mountain and from the Taibai Sequoia tree core on the northern slope of Shangbai Mountain. The Vaganov-Shashkin model was used to reveal the responses of radial growth to the climatic elements in the forest. The results showed that the main climatic factors restricting the growth of T. septentrionalis in the Qinling Mountains were the temperature during the growing season (April-August), the precipitation during the early growing season and the precipitation in July and August. But the precipitation in the early stage of growth could restrain the growth of the P. selatacensis. The precipitation in July and August had significant difference on the south slope and the north slope of Qinling Mountains. During this period, The growth of cedar has a promoting role, but has a certain limiting effect on the growth of S. sequoia; on the same slope, the response of radial growth and climatic factor of sampling points at different altitudes are also different, Cunninghamia lanceolata requires less temperature than low-altitude sampling sites, but needs more soil moisture than low-altitude sampling sites. However, the growth end date was only significantly correlated with the tree-ring width of sampling points on the southern slope.