杉木无性系生长表现和优良无性系选择

对营造在福建省洋口国有林场的10年生杉木无性系测定林进行调查分析得出:试验林总体生长表现较好,树高、胸径和材积生长在无性系间存在明显差异,达极显著水平;无性系的重复力均比较大,其中胸径和材积的无性系重复力达0.691和0.757,无性系的生长稳定性较好;通过综合比较,从试验林选择出优良无性系5个,10年生时平均材积遗传增益达23%以上,材积现实增益达30%以上,表现出明显的生长优势。

The clone growth and superior clone selection of Cunninghamia lanceolata

Based on the investigation and analysis for 10 years old clone test plantation of Cunninghamia lanceolata established in Yangkou National Forest Farm of Fujian Province,it was found that the test plantation had better growth performance as a whole.There were highly significant differences among clones in the growth of tree height,diameter at breast height and stem volume.The clone repeatability of growth traits was relatively large,among which the clone repeatability of diameter at breast height and stem volume reached 0.691 and 0.757 respectively.The growth stability of clones was good.Compared comprehensively,the 5 superior clones which showed very fast growing rate were selected,of which the average genetic gain and realized gain of stem volume at 10 years old was over 23% and 30% respectively.