湘西野生巨紫荆树干解析

Trunk analysis of wild Cercis gigantea in western Hunan

本文运用树干解析的方法,研究了自然生长条件下湘西巨紫荆树高、胸径、材积、生长率和胸高形数的生长变化规律,结果表明:随着树龄的增长,巨紫荆树高、胸径、材积的总生长量逐步增加,20 a还未达到最大值;树高连年生长量和平均生长量在树龄15 a前都呈现出上升趋势,15 a后逐渐下降;胸径总生长量在20 a前随着树龄的增加几乎呈直线增加,生长速度非常快;胸径的平均生长量和连年生长量在18 a分别达到最高值1.08 cm和1.37 cm之后开始下降;材积总生长量逐年增长,连年生长量在18 a达到最大值0.017 m^(3)后开始逐渐下降,并始终高于平均生长量。结果表明巨紫荆是一个生长速度较快的树种。

The variation under natural growth of Cercis gigantea tree height,DBH,volume,growth rate and number of breast height were studied condition by trunk analysis method.The total growth of DBH,tree height and volume increased gradually with the increase of tree age,which was still increased after 20 years.The annual and average growth of tree height showed an upward trend before the age of 15 years,and began to decline after 15 years.The total growth of DBH was increased almost linearly with the increase of tree age before 20 years with high growth rate.The average growth amount of DBH and annual growth amount was turned to decrease after 18 years,reaching the maximum value of 1.08 cm and 1.37 cm,respectively.The total volume growth was increased every year,and the annual growth was decreased gradually after reaching the maximum value of 0.017 m^(3) at 18th year,which were both higher than the average growth.Therefore,Cercis gigantea could be a fast growing tree species.