华北落叶松和其他生物一样,在其发生与系统发育过程中,不断适应环境条件的变化,同时自身也产生变异。由于种内个体间具有不同的遗传基础,因而,表现型有所区别,这就为划分自然类型提供了理论根据。实际证明,在华北落叶松母树林疏伐及选优过程中,天然林和人工林都有形态各异,生长不一的自然类 Like other organisms, Larix principis-rupprechtii is constantly adapting to changes in environmental conditions during its development and phylogeny, and also has its own variation. Due to the different genetic basis among individuals in the species, the phenotypes are different, which provides a theoretical basis for the classification of natural types. It turns out that natural forests and plantations all have different shapes and different growths in natural forests of Larix principis-rupprechtii