【摘要】 为开展巨桉种质源引进,增加遗传多样性,对建立在滇中南地区11个巨桉种源的173家系开展生长性状的年度变异分析。结果表明:参试性状在所有林龄内的种源和家系间均呈极显著差异,参试性状在区组间的F值逐年减小,区组间16月生、28月生和41月生时差异极显著,53月生时差异不显著。胸径的表型和遗传变异系数在23%~46%之间,树高的表型和遗传变异系数在19%~30%之间,单株材积的表型和遗传变异系数在60%~75%之间,参试性状遗传变异系数略低于表型变异系数。相关性分析表明,各林龄间和各参试性状间均呈极显著正相关,各林龄内性状间相关性在0.84~0.94之间;随各林龄时间间隔增长,林龄间性状相关性有下降趋势。整个生长期内,来自昆士兰州Copperlode、昆士兰州Bambaroo和四川乐山的种源长势良好,来自昆士兰州Ravenshoe、昆士兰州Tinaroo和昆士兰州Tully Gorge National Park的种源长势较差。更多还原

【Abstract】 The paper aims to introduce more germplasm of Eucalyptus grandis and improve its genetic diversity. The growth traits of 173 families from 11 provenances in central south Yunnan were analyzed. The variance analysis results showed that there were significant differences of the studied traits among provenances and families at four ages. The F value among blocks decreased with age. There were significant differences of the studied traits among blocks at 16, 28 and 41 months while no difference was found at 53 months. The phenotypic and genetic variation coefficients of diameter at breast height, height and volume were 23%-46%,19%-30% and 60%-75%. The genetic variation coefficients were lower than phenotypic variation coefficientsof the studied traits. The correlation analysis showed that there were significant positive correlations between the studied traits and ages. The correlations of the traits of the same age were ranged from 0.84 to 0.94. The correlations of the traits of different ages decreased with time span. Comprehensive selection results showed that provenances from QLD Copperlode, QLD Bambaroo and Leshan Sichuan Province had best growth while provenances from QLD Ravenshoe, QLD Tinaroo and QLD Tully Gorge National Park had slow growth.更多还原