杉木无性系生长与材性测定的适宜无性系株数与小区株数

对 1块 7年生杉木无性系试验林在不同无性系株数、小区株数抽样下 ,进行树高、胸径、材积及木材密度的无性系排序、遗传参数估算 ,并作效果比较 ,结果如下 :对于生长量测定 ,适宜无性系株数应在 2 0株以上 ,以 30株测定效果较佳 ;适宜小区株数在不同无性系株数下 ,结果不太一致 ,普遍表现为参试无性系株数少 ,宜采用少株小区 ;参试无性系株数多 ,则宜采用多株小区。试验株数为 6、12、2 4株时 ,分别采用 2、4、3或 4株小区的效果较好。对于测定木材密度的适宜无性系采样株数宜在 6株以上 ,而适宜小区采样株数为 1株 ,且为所在小区最优株

Number of Individuals per Clone and per Plot Required for Clone Test of Growth Character and Wood Density of Chinese Fir

Based on the samplings of individuals from different clones and plots in a clone testing stand of Chinese fir ( Cunninghamia lanceolata )at age 7,the paper made the estimation of clone rank correlation and clone repeatability on the height,DBH,volume and the wood density.The results showed that over 20 individuals per clone were sufficient to reliable growth test,30 individuals per clone were better.The number of individuals per plot was different among different numbers of individuals per clone.Fewer tree plots would be chosen if the number of individuals tested per clone were fewer,more tree plots would be chosen if the number was more.For the testing of wood density,the number of individuals per clone should be more than 6,but the sampling number of plot was 1,and that was the plus tree.