生物体都有遗传和变异的生物学特性,任何一种性状的表现都是从内部的基因到外部环境条件共同作用的结果。在同等条件下,由于基因不同,林分中会出现在其生长速度,木材质量,抗性及产脂量等方面是有着优于其他个体的林木。不少地方发现、马尾松林分内,个别单株与邻近的树木相同, Organisms have the biological and genetic characteristics of variation, the performance of any one trait is from the internal genes to the external environmental conditions as a result of the interaction. Under the same conditions, due to different genes, there will be trees in the stand that are superior to other individuals in terms of their growth rate, wood quality, resistance and fat yield. In many places, within the Pinus massoniana forest, individual trees are the same as the adjacent trees,