广西维都林场阴香人工林生长规律研究

采用树干解析法对广西维都林场32年生阴香人工纯林生长规律进行研究，将解析木的树高、胸径和材积同林分树龄之间建立回归方程，并确定为最优生长模型。结果表明：阴香树高、胸径和材积总生长量在32 a时分别为17.6 m、32.55 cm和0.539 m3；树高连年增长量在0～6 a逐年增加，第6年达到峰值，为0.90 m/a，第6年之后树高生长速度总体呈下降趋势；胸径生长与树高生长规律相似，在第4年达到生长峰值，为2.42 cm/a；材积连年生长量随树龄递增先增长后下降，连年生长量峰值出现在第22年，峰值为0.035 m3/a，连年生长曲线与平均生长曲线相交于第32年，由此确定材积数量成熟的年龄为32 a。生长规律回归方程拟合中，树高、胸径与林龄回归模型以理查德模型最优，材积以苏马克模型为最优，拟合相关系数R2均在0.997以上，残差平方和较小，拟合效果良好。

Studies on Growth Rhythm of 32 a Cinnamomum burmanni

By the stem analysis method,the growth rhythm of 32-year-old Cinnamomum burmanni plantation in Guangxi Weidu forest farms was analyzed.Base on the data of tree height,DBH,total volume growth and stand age,we established regressive equation and determined the optimum growth model.The results showed that the tree height,DBH and volume of the 32-year-old Cinnamomum burmanni were 17.6 m,32.55 cm and 0.539 m3,re-spectively.The annual increment of tree height was increase gradually in the first 6 years,and then reached the peak in the 6 th year,which was 0.90 m/a.After that,tree height gradually decreased with age.Also,DBH growth have the similar change rule,in which annual increment of DBH reached the peak in the 4th year,with the value of 2.42 cm/a.What′s more,the annual increment of volume was increase first and then declining with age,the growth peak of which appeared in 22-year,with the value of 0.035 m3/a.The annual growth curve and average growth curve intersected in 32-year,thus we could determine the age of volume mature was 32 years.Af-ter fitting by growth regularities regression equation,we found that,among the regression models of tree height, DBH and forest age,Richard model was optimal,and SuMaKe model was optimal for volume,fitting correlation coefficient R2 were all above 0.997,the sum of squared residuals was lesser,growth prediction model has higher accuracy.