杉木多代连栽地营造混交林生长特点分析

在３代杉木彬要伐迹地营造杉木火力楠混交林试验，结果表明：混交林中杉木的树高生长量始终比对照的大，在６年生前对照杉木和混交林杉木树高总生长量、树高平均生长量的差异较小，随后其差异逐年增大，混交林的胸径总生长量、平均生长量、连年生长量始终比纯林的大、混交林中的杉木材积生长指标 始终比对照的大，且差异基本上随年龄的增加而增加。

On Growth Characteristics of Mixed Forest Planted on Site of Continous Planting Chinese Fir

Experiment of planting mixed forest of Chinese fir and Michelia macclurei(52) on cutover area of the third Chinese fir rotation has been done,the result shows:The height increment of Chinese fir in mixed forest is larger than control stand.The difference of total height increment and mean height increment is little before 6yearold,and increases year by year soon afterwards.The total increment,mean increment and current annual increment of D.B.H.of mixed forest are larger than control stand.The tree volume growth indexes of Chinese fir in mixed forest are much larger than control stand from beginning to end,and those differences increase with year mainly.