Structure and dynamics of a Castanopsis cuspidata var. sieboldii population in an old-growth, evergreen, broad-leaved forest: The importance of sprout regeneration
Structure and dynamics of a Castanopsis cuspidata var. sieboldii population in an old-growth, evergreen, broad-leaved forest: The importance of sprout regeneration
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DOI：
10.1046/j.1440-1703.2003.00540.x
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发表时间：
2003-03
影响因子：
2
通讯作者：
M. Miura;Shin‐ichi Yamamoto
中科院分区：
文献类型：
--
作者：
M. Miura;Shin‐ichi Yamamoto
研究了东北锥的种群结构和动态。sieboldii进行了研究，以评估在一个古老的，万年青阔叶林暴露于低强度的台风干扰，每年台风在日本对马群岛的营养和幼树更新。个体密度≥5 cm d.b.h. 1990年为38.0公顷-1; 7.9%为多茎个体。在7年的研究期间（1990-1997年），个体数量减少，但茎的数量增加。超过30%的明显死亡的个体通过发芽茎重建。与萌芽更新相比，幼树更新很少发生，仅在林隙中观察到。大多数个体至少有一个芽枝（H ≥30 cm，d.b.h. <5 cm），随着个体的增大，萌芽枝的数量和大小也随之增加。在研究期间，较大的个体与茎断裂倾向于产生芽茎。树苗的密度为1074 ha−1，它们在林冠间隙中比在封闭的林冠下更丰富，但即使在林冠间隙中，大型树苗也非常罕见。C的人口。尖形变种天女兰主要由单茎个体和提供芽库的少数多茎个体组成。较大的个体对低强度的台风干扰作出反应，并形成芽茎。虽然观察到许多树苗，再生发生更经常芽形成比树苗的生长。因此，萌芽更新是一种重要的更新模式，它允许这种先驱样种在这片森林中维持其种群。
The population structure and dynamics of Castanopsis cuspidata var. sieboldii were studied to evaluate vegetative and sapling regeneration in an old-growth, evergreen broad-leaved forest exposed to low-severity typhoon disturbances by annual typhoons on the Tsushima Islands in Japan. The density of individuals ≥5 cm d.b.h. was 38.0 ha−1 in 1990; 7.9% were multiple-stemmed individuals. Over the 7-year study period (1990–1997), the number of individuals decreased, although the number of stems increased. Over 30% of apparently dead individuals were reconstituted by sprouting stems. Compared with sprout regeneration, sapling regeneration rarely occurred and was only observed in canopy gaps. Most individuals had at least one sprout shoot (H ≥30 cm, d.b.h. <5 cm), and the number and size of sprout shoots increased as the size of the individuals increased. During the study period, larger individuals with stem breakage tended to produce sprout stems. The density of saplings was 1074 ha−1 and they were more abundant in canopy gaps than under closed canopies, but large saplings were very rare even in canopy gaps. The population of C. cuspidata var. sieboldii consisted primarily of single-stemmed individuals with a few multiple-stemmed individuals providing a sprout bank. Larger individuals responded to the low severity typhoon disturbances and formed sprout stems. Although many saplings were observed, regeneration occurred more often by sprout formation than by growth of saplings. Thus, sprout regeneration is an important mode of regeneration, which allows this pioneer-like species to maintain its population in this forest.