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连续3年对中山杉302(Taxodium’Zhongshansha302’)回交一代(BackcrossedF1,简称为BCF1)〔中山杉302(T.’Zhongshansha302’)×墨杉(T.mucronutumTenore)〕的13个无性系的苗期生长量(株高和地径)、标准木的地上部分生物量和分枝结构进行了测定,结果表明:BCF1102、BCF1118、BCF161和BCF1149的生长量和地上部分生物量明显高于亲本中山杉302,可以作为优选出的4个具有潜在推广价值的新无性系:其中BCF1102、BCF1118和BCF1613个无性系树干生物量占地上部分总生物量的比例均大于50%,也高于其他无性系,而树枝生物量比例较低,可以作为速生用材类型,BCF1149树叶生物量占地上部分总生物量的比重高达45%,可以作为速生观赏类型。运用通径分析方法对标准木的分枝结构与树高生长量的关系进行了分析,结果表明分枝数量是树高生长的首要决定因素,这4个速生无性系单株分枝数量高于其他类型。盐碱地造林结果表明:在pH8.5的滨海轻盐上,除BCF161的生长量受到一定抑制外,其他3个无性系BCF1102、BCF1118和BCF1149的生长量仍高于亲本中山杉302。运用RAPD分子标记鉴定了这4个优良无性系的遗传身份。
Thirteen clones of 13 clones of Taxodium ’Zhongshansha 302’ backcrossedF1 (referred to as BCF1) [T.’Zhongshansha 302 ’× T. mucronutumTenore] The results showed that the growth and above-ground biomass of BCF1102, BCF1118, BCF161 and BCF1149 were significantly higher than those of Zhongshan fir 302, which can be used as four new potential clones with potential promotion value. Among them, the clonal trunk biomass of BCF1102, BCF1118 and BCF1613 accounted for more than 50% of the total aboveground biomass, but also higher than other clones, The low proportion of branch biomass can be used as fast-growing timber types, BCF1149 leaf biomass accounted for up to 45% of the total aboveground biomass, can be used as fast-growing ornamental type. The relationship between branching structure and tree height growth of standard wood was analyzed by using the path analysis method. The results showed that the number of branches was the primary determinant of tree height growth. The number of branches per plant in the four quick-growing clones was higher than Other types. The results of saline-alkali afforestation showed that the growth of BCF161 was still higher than that of Zhongshan fir 302 at the pH8.5 of coastal light salt except that the growth of BCF161 was restrained. The RAPD markers were used to identify the genetic identity of these four elite clones.