Structure and regeneration of canopy species in an old-growth evergreen broad-leaved forest in Aya district, southwestern Japan
Structure and regeneration of canopy species in an old-growth evergreen broad-leaved forest in Aya district, southwestern Japan
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日本西南部绫县古老常绿阔叶林冠层物种的结构和更新
DOI：
10.1007/bf00033258
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
S. Yamamoto
中科院分区：
文献类型：
--
作者：
H. Tanouchi;S. Yamamoto
在日本西南部绫县的一片古老常绿阔叶林的 4 公顷土地上，对种群结构和冠层物种的再生进行了研究。 200 m × 200 m 地块内有树种 50 个，其中树冠树种 22 个，树径 3 904 株（胸径≥5 cm），总断面积 48.3 m2/ha。样地内存在 41 个缝隙，平均缝隙尺寸（67.3 平方米）和缝隙占样地面积的总面积（6.9%）均较小。根据大小和空间分布模式以及每种树木大小的密度，图中树冠中发现的物种被分为三组（A、B、C）。 A组（典型物种：Distylium racemosum、Persea japonica）表现出高密度、近随机分布和反J形尺寸分布。 B 组的物种（柳栎、锐栎、栎树）呈传染性分布，间隙周围小树（<5 厘米胸径）明显集中。然而，该组中的物种中很少有可能在不久的将来到达树冠的树木。 C组包括快速生长的先驱和不耐荫的物种（例如Cornus controversa、Carpinus tschonoskii、Fagara ailanthoides），它们形成大丛。大多数间隙的特征并不在于 B 组和 C 组的成功再生，但似乎确实加速了 A 组的生长。B 组物种似乎需要长期存在或较大的间隙，而 C 组物种则需要大规模的灾难性扰动（例如山体滑坡）才能再生。
The population structure and regeneration of canopy species were studied in a 4 ha plot in an old-growth evergreen broad-leaved forest in the Aya district of southwestern Japan. The 200 m × 200 m plot contained 50 tree species, including 22 canopy species, 3,904 trees (dbh≥5 cm) and a total basal area of 48.3 m2/ha. Forty one gaps occurred within the plot, and both the average gap size (67.3 m2) and the total area of gap to plot area (6.9%) were small. Species found in the canopy in the plot were divided into three groups (A, B, C) based on size and spatial distribution patterns, and density in each tree size. Group A (typical species:Distylium racemosum, Persea japonica) showed a high density, nearly random distribution and an inverse J-shaped size distribution. Species in group B (Quercus salicina, Quercus acuta, Quercus gilva) were distributed contagiously with conspicuous concentration of small trees (<5 cm dbh) around gaps. However, the species in this group included few trees likely to reach the canopy in the near future. Group C included fast-growing pioneer and shade intolerant species (e.g.Cornus controversa, Carpinus tschonoskii, Fagara ailanthoides), which formed large clumps. Most gaps were not characterized by successful regeneration of group B and C but did appear to accelerate the growth of group A. Group B species appear to require long-lived or large gaps while group C species require large, catastrophic disturbances, such as landslides, for regeneration.