火炬松种子园无性系产果力变异与选择研究

Research on Variation and Selection of Clone Cone Productivity in a Loblolly Pine Seed Orchard

对英德火炬松种子园２２７个无性系产果量问题的研究结果表明，无性系间、株间以及年度间产果量变异很大，差异显著；产果量性状与高、径、材积生长性状呈弱相关，前后年度间以及与３年平均产量间则高度相关。产果量重复力在０．６以上，３～４年球果观察资料可以判断无性系产果能力，从２５％～３０％高产优系中再选择建立改良代种子园，与受选群体均值比，能提高产量６４％～１４５％，甚至更高。

Two hundred and twenty seven clones in Yingde Loblolly Pine Seed Orchard were studied for their cone productions.The result showed that there was very large variation in cone production.The differences between clones,ramets and years were all significant.Cone production was weakly or not correlative with height, DBH and volume growth.However,the correlation between cone productions in different years were strong,and those of every year and the average of three years were the same.The repetition ability of cone production was over 0.6.The observation data of cone production for 3～4 years can be used to determine cone productivity of the clones in future.When the clones with high cone production,which account for 25%～30% of all the studied clones,are re selected to establish an advanced seed orchard,64%～145% or higher of cone production can be made over the average of the selecting population.