杉木优良无性系选择研究

以贵州黎平杉木初级种子园混合种作对照,对8年生树木无性系试验林生长情况进行分析。结果表明,21个杉木无性系高径材积存在显著差异,5、20、11号无性系生长材积量居前3位。用系统聚类法将参试无性系分成Ⅳ类,Ⅰ、Ⅱ类无性系材积增益107.99%和107.66%,具有较大的增产效果和较高的推广价值。

Stuay on Selections of Excellent Clones of Cunninghamia lanceolata

Analysis on the growth conditions of 8-year-old clones of Cunninghamia lanceolata are condncted by comparison of mixed species of elementary seed garden of Cunninghamia lanceolata in Liping country of Guizhou Province,The results shows that there are obvious differences in volumes Among 21 high-diameter clones,the first three of clones in volume increment are 5,20 and 11 respetively.The experimented clones are divided into four types by using System Cluster Method,Among four types,volume increments from the first and second type are 107.99% and 107.66% respectively,the two types have larger effect of increasing yield,So the have better extension value.