红心材杉木生长材质变异及早期选择

Variation of Growth and Wood Property Traits of Red Heartwood Cunninghamia lanceolata and Its Early Selection

  • 摘要: 以广东杉木基因库中104份红心材种质为试材,对其6年生嫁接无性系生长材质性状进行测定分析。结果显示:树高、胸径、材积、木材基本密度等性状在无性系间差异极显著,早期红心材特征表现各异,仅有40个无性系凸显红心材特征,但重现率不一,同一无性系不同嫁接分株间红心材比率也有所不同,不同无性系早期最大红心材比率差异较大;无性系生长性状重复力较高,木材基本密度重复力0.37,红心材重现率≥50%的无性系仅有14个;生长性状间及早期红心材特征与木材基本密度间均为显著或极显著正相关关系。以胸径为选择指标,对红心材重现率≥50%的无性系进行再选择,选获cx180、cx200、cx624、cx703、cx710、cx725、cx729、cx735、cx746、cx762、cx797等11个速生红心材无性系。这些无性系红心材出现时间早,组成的群体在胸径、木材基本密度、最大红心材比率等方面均可获得正向增益。

     

    Abstract: This study concentrated on the assessment of growth and wood property traits in a 6-year grafted clone test of 104 red heartwood Cunninghamia lanceolata. The results indicate that all growth traits of height, diameter at breast height (DBH), stem volume and the wood basic density (WBD) varied significantly among clones. Remarkable clonal differences were also observed for the wood with or without the red heartwood (RHW). Only 40 C. lanceolata clones expressed a notable RHW but each had a different reappear rate and maximum RHW ratio because the RHW ratio varied among ramets of a clone. The growth traits consistently had a high repeatability estimate, and the WBD was 0.37, 14 clones had a notable RHW with reappear rate of ≥50%. Phenotypic correlations for growth traits, RHW with WBD traits were strong and positive. When selection was made for DBH and RHW reappear rate (≥50%), 11 elite clones (cx180, cx200, cx624, cx703, cx710, cx725, cx729, cx735, cx746, cx762, cx797) were identified with an consistently positive realized gain in DBH, WBD and maximum RHW ratio.

     

/

返回文章
返回