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在杉木种子园中对6个无亲缘关系的无性系进行了双列杂交,包括自交。同时取亲本的自由授扮种子作为对照。在他们的子代林中,取一个全同胞家系和一个自由授粉家系,各选4至6株开花植株连同它们的亲本,分别进行自交、回交、同胞内交配和异交测定。结果表明,杉木近交使得种子发芽率和苗木高生长量大幅度下降。近交衰退随着近交系数(F)的增加而加大。同异交相比,自交、回交和全同胞交配、半同胞交配组合的种子发芽率分别平均降低约88％、42％和20％,苗木平均高度分别下降27％、17％和13％左右。结果也显示,在不同个体之间近交衰退程度存在明显差异。
Six pairs of unrelated clones were performed in the Chinese fir seed orchard, including selfing. At the same time take the freedom of the parents to play the seeds as a control. In their offspring, one full sib family and one free pollinating family were selected. Four to six flowering plants from each of the four selected flowering plants, along with their parents, were tested for selfing, backcrossing, intraspecific mating and outcrossing. The results showed that inbreeding of Chinese fir resulted in a significant decrease of seed germination rate and seedling height growth. Inbreeding recession increased with increasing inbreeding coefficient (F). Seed germination rates of selfing, backcrossing and all-sibling mating and semi-sibling mating were reduced by about 88%, 42% and 20% respectively on average, and the average height of seedlings decreased by 27%, 17% and 13% about. The results also showed that there was a significant difference in the degree of inbreeding between different individuals.