Am J Bot. 1997 Sep;84(9):1294.
We analyzed the spatial patterns among seeds, seedlings, saplings, and conspecific adult trees of the cool-temperate tree species Acer palmatum var. Matsumurae in a conifer-hardwood mixed forest in northern Japan, using two models that consider the influence of each adult within the neighborhood of the offspring. The results showed that recruitment patterns of each stage could be characterized and that significant shifts occur between successive stages. Sound seeds were more widely dispersed than unsound seeds; the mean dispersal distance (MDD) was 41.5 m for sound seeds, but only 12.6 m for unsound seeds. Most seedlings were located near conspecific adult trees, with a MDD of 14.3 m. Saplings, however, were more dispersed away from conspecific adult trees, with an MDD of more than 35 m. Light and gap distributions did not strongly affect the spatial distribution of the offspring; most saplings were located under nonconspecific canopies. These results suggest that the recruitment pattern of Japanese maple offspring is strongly affected by conspecific adult neighbors, rather than by light and gap distributions, with close proximity to conspecific adult trees reducing the growth and survival of seedlings during the transition to saplings.
我们分析了在日本北部的一个针叶树-阔叶混交林中，冷温带树种 Acer palmatum var. Matsumurae 的种子、幼苗、幼树和同种成年树之间的空间模式，使用了两种考虑每个成年个体对后代所在邻居影响的模型。结果表明，每个阶段的繁殖模式都可以被描述，并且在连续阶段之间会发生显著的转变。健全的种子比不健全的种子分布得更广；健全种子的平均扩散距离（MDD）为 41.5 米，而不健全种子的 MDD 仅为 12.6 米。大多数幼苗位于同种成年树附近，MDD 为 14.3 米。然而，幼树的分布更加分散，远离同种成年树，MDD 超过 35 米。光照和空隙分布并没有强烈影响后代的空间分布；大多数幼树位于非同种树冠下。这些结果表明，日本枫后代的繁殖模式受到同种成年树邻居的强烈影响，而不是光照和空隙分布的影响，与同种成年树的近距离会降低幼苗向幼树过渡时的生长和生存。
