杉木半同胞子代优良家系决选

摘要

Introduced from 14 primary seed orchards nationwide,and established from 1985,84 Cunninghamia lanceolata stands of half-sib progeny were analyzed on 4 ages (5-year,8-year,26-year and 30-year).The results showed that there were significant differences among most family progenies in tree height,DBH and volume at different stages of growth.The growth traits presented stable in juvenile-mature period.According to the volume of 30-year-old families,15 families produced from Guangxi,Guizhou,Hunan and Fujian were finally selected as superior families.The average volume,volume gain and genetic gain of the superior families were more than 0.335 0m3,15.73% and 11.93%,respectively,among which,the average genetic gain of superior families produced from Guangxi was up to 65.52%.%对营建于1985年、引种自全国14个初级种子园的84个杉木半同胞家系子代区域试验林的4个林龄段(5年、8年、26年及30年)的林木生长情况进行统计分析.结果表明,在不同生长阶段,多数家系子代的树高、胸径和材积生长指标均呈极显著差异,且早晚生长表现较稳定.以30年生时的材积作为评选依据,有产自广西、贵州、湖南和福建等省区的15个家系入选为优良家系,其家系平均材积、材积现实增益和遗传增益分别达到0.335 0m3、15.73%和11.93%以上,其中产自广西的入选优良家系平均遗传增益高达65.52%.