尾叶桉无性系多性状遗传分析

Genetic analysis of the traits of Eucalyptus urophylla clones

对广西山口林场、钦廉林场天堂分场及钦州市犀牛脚镇等3个地点20个以尾叶桉为主参试无性系6、12、18、42个月生的生长性状进行分析与遗传测定.结果表明:参试的20个无性系生长性状在无性系、地点和无性系×地点交互效应上均存在极显著差异;42个月生参试的20个无性系在不同试验地点平均生长量表现为:钦廉林场天堂分场>山口林场>钦州市犀牛脚镇,性状综合分析及评定表明12、15、18号等3个尾叶桉无性系适应性广,具速生丰产性,可推广利用;3个试点选择12、15、18号3个普适型无性系时,其单株材积遗传增益可达35.32%-47.57%.

The investigation was conducted at 3 plantations including 20 clones of Eucalyptus urophylla at Shankou Forest Farm,Tiantang Branch of Qinlian Forest Farm and Xiniujiao Town of Qinzhou City in Guangxi of China.Growth traits including height,DBH and volume per hectare were investigated in 6,12,18,42 months old plants,respectively.The results of variance and genetic analysis indicated that：（1） there were remarkable differences in height,DBH and volume per hectare among clones,sites and clone×site;（2） level of growth was Tiantang Branch of Qinlian Forest FarmShankou Forest FarmXiniujiao Town of Qinzhou City;（3） comprehensive analysis of clones traits indicated that clones 12,15 and 18 grew fast and steady in different sites,and the genetic gain of growth volume was estimated to be 35.32%-47.57% at the age of 42 months.