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我国优树都是根据表型选择的。表型既受基因型影响,也受环境影响,许多数量性状和树高、胸径等的变异水平,在很大程度上决定于环境条件的多样性。由于林地条件复杂多变,树木个体发育周期长,选优时弄不清土壤的差异和树木个体所经历的历史,所以仅根据表型入选的优树中,一般只有1/4属遗传上的优树,1/2为中等树,还有1/4属遗传上的劣树。因此增产效果不大,杉木子代测定结果表明,有的优树增产达26%,
The best tree in our country is based on the phenotype choice. Phenotypes are affected not only by genotype but also by the environment, and many quantitative traits and variations in tree height and DBH are largely determined by the diversity of environmental conditions. Due to the complexity and variety of woodland conditions, the long developmental period of individual trees, the difference between the soil and the history of individual trees that can not be distinguished at the time of selection, only one-fourth genera Superior trees, 1/2 for medium trees, and 1/4 genetically inferior trees. Therefore, the yield increase effect is not big, fir progeny test results show that some tree yield increase of 26%