火炬松自由授粉家系年度生长相关与早期选择研究

对火炬松３０个自由授粉家系８个年度（１～２，４～８，１３年生）的生长数据进行相关分析，结果表明，２，４～８年生生长量与１３年生生长量存在着显著或极显著的表型相关，年度性状间的遗传相关系数均大于相应的表型相关系数。早期选择可在４年生依家系的胸径生长量进行，或在２年生依家系的树高生长量作低强度选优，以指导从初级种子园采集优系种了及再选择改良种子园。

STUDY ON THE GROWTH CORRELATION BETWEEN AGES OF LOBLOLLY PINE OPEN POLLINATED FAMILIES AND EARLY SELECTION

Growth data in 8 years (at the age 1,2,4,5,6,7,8 and 13) from 30 open pollinated families of loblolly pine were analyzed. The results show that phenotypic correlations of growth traits between the age 2 and age 13, age 4 to 8 and age 13 were significant or extremely significant. Genotypic correlation coefficients between ages for growth traits were all large than the corresponding phenotypic correlation coefficients. Early selection can be carried out at the age of 4 years according to the diameter at breast height (DBH). It may be scheduled forward to the age of 2 years with low intention selection, according to the height growth, in order to guide the seed collection of superior clones from the primary seed orchard, or guide the clone reselection to establish a improved seed orchard.