罗田垂枝杉优树选择初报

罗田垂枝杉是杉木优良变异类型,其显著特征是7 a以上老枝自然脱落,树干通直,可通过密植提高单位面积产量。为获得优良繁殖材料,在分布于不同地点的5片罗田垂枝杉人工林中初步选出64株优树,入选比率在3.10%～4.03%之间。分析结果表明:罗田垂枝杉不同无性系间主要生长性状存在显著变异,其中材积变异系数均在30%以上。天堂寨林场及薄刀峰林场的献旗岭、铁岭坳和麻栗坪人工林中初选优树平均材积分别是其林分材积均值的1.59,1.44,1.67和1.96倍。

Study on the selection of superior trees of Cunninghamia lanceolata (Lamb.)Hook.cv.Luotian

Cunninghamia lanceolata Luotian is a fine variation of Chinese-fir discovered in Luotian county.Shedding naturally of over 7 years' old branches and straight trunk are its obvious characters.In order to achieve good breeding materials,64 superior trees were selected out initially from 5 plantations located in different sites by means of standard methods,and the selection ratio was between 3.10% and 4.03%.The results showed that there was significant difference among the main growth traits of different clones of Cunninghamia lanceolata cv.Luotian,and the coefficient of variation of the volume reached over 30%.In addition,the average volume of superior trees selected from Tiantangzhai Forest Farm,xianqiling,tielingao in baodaofeng Forest Farm and Maliping were 1.59,1.44,1.67 and 1.96 times respectively as large as that of strand.