不同密度条件下樟树幼苗生长和幼苗重量分配格局

以1年生樟树(Cinnamomum camphora)实生苗为试验材料,在美植袋中分别种植1、2、4和8株幼苗(密度I、II、III和IV),研究密度对幼苗的生长和生物量的影响。结果表明,樟树幼苗的地径随着密度增大而减小,苗高为密度IIIIVIII。樟树幼苗单株幼苗各器官干重和幼苗单株干重均随密度增加而减少,每盆幼苗的总生物量随密度增大而增加。樟树密度I的干重为根叶干枝,其余3个密度的干重为根干叶枝。各密度的根冠比大于1。

Growth and weight distribution pattern in Cinnamomum camphora seedlings with different densities

One-year-old seedlings of Cinnamomum camphora were planted with four densities: 1, 2, 4, and 8 seedlings per bag (density I, II, III and IV). The effect of the planting density on the growth and weight distribution pattern of these seedlings were studied. The?results showed that the mean ground diameter decreased with an increase of the density. The mean seedling height was in the order of III> IV> II> I density for C. camphora seedlings. The dry weight of roots, stems, branches, and leaves and the total tree dry weight of C. camphora seedlings decreased with increasing density. The dry weight of individual organs decreased in the order of roots > leaves > stems > branches in density I and roots > stems > leaves > branches in other density plantings. The root-shoot ratio of seedlings in all density treatments was >1.