适合雪峰山区的杉木大径材无性系选择

Clone selection of Chinese fir large-diameter timber suitable for Xuefeng Mountain area

通过对雪峰山区35年生杉木无性系测定林调查分析,得知各无性系之间胸径、树高、单株材积及大径材的株比例、出材量、出材率均存在极显著差异,为优良无性系选择提供了科学依据。各重复(不同立地条件)之间以上指标同样存在极显著差异,说明立地条件对杉木无性系的生长也极其重要。本试验选择出9个高产大径材优良无性系,胸径达27.8 cm以上、树高达21.3 m以上、单株材积达0.6467 m 3以上、大径材的株比例达70.0%、出材量达487.1 m 3·hm-2、出材率达71.1%以上,分别大于对照13.0%、6.0%、32.9%、40.0%、76.8%、41.1%以上。

This work investigated and analyzed the 35-year-old Chinese fir clones test plantation in Xuefeng Mountain.It was found that there were significant differences in DBH,tree height,volume per plant,proportion of large-diameter trees,timber yield,and timber rate between clones.The results provided a scientific basis for the selection of excellent clones.There were extremely significant differences among the replicates(different site conditions)too,indicating that site conditions were also very important for clone growth.Nine excellent clones of high yield large diameter were selected in this experiment,with the average DBH of 27.8 cm,the tree height of 21.3 m,the single tree volume above 0.6467 m 3,the large diameter wood plant ratio of 70.0%,the material output of 487.1 m 3·hm-2,and the material output rate of 71.1%or more,which were higher than those of control by 13.0%,6.0%,32.9%,40.0%,76.8%,and 41.1%or more,respectively.