8年生直干大叶相思无性系多性状综合选择

Comprehensive selection of 8 years old Acacia auriculiformis clones based on multiple traits

对福建省漳浦中西国有林场28个8年直干大叶相思无性系的树高、胸径、枝下高、冠幅以及材积5个性状进行调查研究,结果表明:28个无性系性状差异均达到极显著水平,无性系效应明显;8年无性系胸径、材积有较强的重复力,分别为0.43和0.45;采用综合得分法,将无性系分为Ⅰ、Ⅱ、Ⅲ、Ⅳ,分别代表优、良、中、差,平均遗传增益分别为5.47%、2.73%、-2.8%、-5.71%,其中遗传增益最大为3号无性系,材积遗传增益达6.85%,根据50%的入选率选出Ⅰ、Ⅱ类为直干大叶相思优良无性系;最后根据4年、8年材积排序变化在Ⅰ、Ⅱ类型中选出速生稳定型9、1、5、7、8、21号,后期速生型10、12、3、23、6、29、7号.

Twenty-eight 8 years old straight-stem Acacia auriculiformis clones were investigated by height, diameter at breast height （ DBH） , height under branch, crown width and volume in Zhangpu Zhongxi National Forest Farm in Fujian Province. Results showed that phenotypic traits varied significantly among clones indicating a satisfactory clonal effect. Repeatabilities of DBH and vol-ume were relatively high, reaching 0.43 and 0.45, respectively. Then 28 clones were divided into 4 categories by comprehensive sco-ring, from premium, fine, intermediate and defective, with means of genetic gain being 5.47%, 2.73%,-2.8%,-5.71%, respec-tively. Among them, No.3 clone had the higherst genetic gain, with the genetic gain of volume reaching 6.85%. According to selec-tive ratio of 50%, typeⅠandⅡwere selected. Finally, referring to rankings of volumes for 4 and 8 years old clones, No.9, 1, 5, 7, 8 and 21 clones were identified as the type of stable fast-growth, and No. 10, 12, 3, 23, 6, 29 and 7 clones were late fast-growth.