日本落叶松种子园同胞家系15a生时的观察分析

Study on half-sib family of seed orchard of Larix kaempferi at 15-yr-old

利用日本落叶松种子园半同胞家系,按田间设计要求建立家系对比试验林,林龄10 a生通过鉴定。本次分析认为试验林家系之间、家系与对照之间、林木个体间变化都很大,家系试验林的各种参数是动态的。15 a生时,胸径遗传增益(△G)为3.16%、树高为1.17%、材积是6.11%。根据家系现在的胸径、材积的遗传增益(△G))5%以上的标准再筛选家系,可选出4个生长最好的家系,用这4个家系推算1.5世代材积增长率是20.27%。

Larix kaempferi seed orchard half sib - family contrast test - woodland was built according to the field de sign ,which being studied after 10 years. There was great change among test - woodland family, family and contrast, as well as association individual. The change of every parameter of family test - woodland was dynamic. The genetic gain of the diameter （△ G） was 3.16%, and tree height was 1.17 %, the volume was 6.11% at 15 - yr-old. The four best families were selected aceording to the standard of the genetic gain of the diameter and the height above 5 % So it could be calculated with the four families that increase rate of the vdume at 1.5 generation was 20,27%.