摘要
本文报道了在湖北省黄冈地区种植的被誉为活化石树种——水杉无性系选择12 a的结果。研究表明,水杉个体间遗传差异极大,为无性系选择提供了可能,但在散生大树中开展选优,效果差,而以实生人工幼林为对象选优,效果很好。说明选种群体的生境一致有科学选种的基础。统计分析表明,水杉生长量早一晚龄相关十分密切,甚至一年生时,就表现出优良的特性直到12～13年生时仍处领先位次,如仅用生长性状作无性系选择可在较早龄进行,不必等到1/3个轮伐期。
31 clones of Metasequoia glyptostroboides have been tested at two sites in Huanggang Region, Hubei Province for 12 years. The main trial consists of three randomized complete block with row plot. The results of variance analysis at the age of 12 year-old showed that there are significant differences in growth traits and crown shape among clones and the clones of inherent rapid growth could be characterized at early stage in field by planting grafts. Correlated responses to selection suggested that the fourth or fifth year would be the appropriate time to select according to the height growth. The tree breeders have embraced testing and selection at early ages in clonal breeding.
出处
《林业科学研究》
CSCD
北大核心
1992年第5期506-511,共6页
Forest Research
关键词
水杉
无性系
育种
Metasequoia glyptostroboides plus tree clonal test juvenilemature correlation
