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根据日本落叶松胸径、树高早-晚相关性,以6年生时的胸径作为选择指标依据,对湖北省建始县长岭岗日本落叶松种子园自由授粉家系子代开展了早期测定。结果表明:种子园子代生长明显高于母树林和速生丰产林子代,其胸径、树高生长分别是母树林子代的1.16、1.09倍,是速生丰产林子代的1.71、1.49倍;以所有参试家系的胸径平均值与标准差之和为标准,早期选择的7个优良家系所获得的遗传增益为12.3%。
According to the Japanese larch diameter at breast height and tree height early-late correlation, taking the 6-year-old DBH as the selection index, we carried out the early determination of the offspring of free pollination offspring of Japanese Larch Seed Orchard in Changling County, Hubei Province. The results showed that the seedling growth of seed orchard was significantly higher than that of the parent tree and the fast-growing and high-yielding forest. The DBH and tree height growth were 1.16 and 1.09 times of that of the parent tree and 1.71 and 1.49 times of that of the fast growing and high yielding forest, respectively. The average of DBH and standard deviation of the test line was taken as the standard. The genetic gain of the 7 elite early families was 12.3%.