太白山南坡不同海拔高度样地巴山冷杉生长动态研究

Analysis on Growth Dynamics of Abies fargesii in Different Elevations Plot on South Slope of Taibai Mountain

2014年和2022年对太白山南坡两处不同海拔高度的固定样地调查后进行数据分析,探讨不同海拔高度区域的巴山冷杉林生长动态变化。结果表明:立地条件类似,海拔高低对巴山冷杉的分布数量、郁闭度大小、幼苗更新情况、平均胸径大小、胸径增长速度和生长高度等方面影响比较显著;海拔高的样地巴山冷杉的分布数量、郁闭度、幼苗更新、胸径增长等变化好于海拔低的样地;海拔高的样地,巴山冷杉平均胸径为中径组,个体胸径差异小,树木高度也更集中;海拔低的样地,巴山冷杉平均胸径为大径组,个体胸径差异大,树木高度易出现两极分化。

By analyzing the survey data of two fixed plots at different elevations on the south slope of Taibai Mountain in 2014 and 2022,the growth dynamics of Abies fargesii forest in different elevations was discussed.The results showed that:Habitat conditions were similar.Elevation had significant effects on the distribution quantity,degree of canopy density,seedling update,mean DBH change,DBH growth rate and growth height of Abies fargesii;Distribution quantity,canopy density,seedling renewal,and DBH growth of Abies fargesii changed in high elevation plot was better than that of low elevation plot;At high elevation plot,the average DBH of Abies fargesii was medium diameter group.The difference of individual DBH was small,and the tree height was more concentrated;In the low elevation plot,the average DBH of Abies fargesii was large diameter group.The individual DBH varied greatly,and the tree height was prone to polarization..