基于树木年轮宽度的秦岭太白红杉(Larix chinensis)生长变化规律研究

Research on the Growth Law of Larix chinensis in the Qinling Mountains on the Basis of the Tree-ring Width

采用相关性分析法、时间序列ARIMA模型及检验,探讨太白红杉BAI(Basal Areas Increment)与地形因子(海拔、坡度和坡向)的关系及其生长规律。结果表明:太白红杉平均BAI与海拔和坡度呈负相关关系,南坡BAI生长趋势较北坡增幅大;太白红杉第1次生长高峰出现在20a左右,大高峰约16 a^20 a左右出现一次,小高峰约4 a^6 a左右出现一次,历史最低值和最高值出现在1840年和1997年;太白红杉BAI与地形因子海拔和坡度呈较显著负相关关系,较适宜的海拔和坡度范围分别是在3 050 m^3 150 m和10°~20°;生长规律为幼龄太白红杉BAI处于快速增长的阶段,中龄后太白红杉BAI增速减缓,但整体生长趋势呈现较平稳上升的态势。

Studies were made of the relationship between BAI（Basal Areas Increment） and topographical factors（elevation,gradient and exposure）,and discussion was made on the growth law of Larix chinensis by using correlation analysis method,time sequence ARIMA model and inspection. There was negative correlation between BAI and elevation or gradient. The larger the elevation or gradient were,the slower BAI would be. BAI growth tendency in the South Slope had the larger amplitude than that in the North Slope. The 1 st growth peak of BAI appeared at the age of 20 a. The big peak and small peak occurred in16 a - 20 a and in 4 a - 6 a,respectively. The historical minimum and maximum appeared in 1840 and1997. BAI had the negative correlation with elevation and gradient. The suitable elevation and gradient were 3 050 m - 3 150 m and 10° - 20°,respectively. The growth law showed that BAI of young-aged L.Chinensis was in the stage of rapid growth,BAI of middle and later age had slower growth,but the general growth exhibited in the stably rising tendency.