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首页> 外文期刊>Journal of Forest Planning >Stand Structure and Geographic Conditions of Natural Selection Forests in Central Hokkaido, Northern Japan
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Stand Structure and Geographic Conditions of Natural Selection Forests in Central Hokkaido, Northern Japan

机译：日本北部北海道中部天然林的林分结构和地理条件

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摘要

Selection forest is a forest managed with the uneven-aged silvicultural system, in which trees are removed individually from a large area periodically. Selection system has been used to manage natural forests in Hokkaido, northern Japan. This study demonstrated the characteristics of natural selection forests in central Hokkaido. A case analysis was conducted at the University of Tokyo (UT) Hokkaido Forest to closely examine the structure and geography of selection stands. We used a total of 1,382 sample plots that had established in selection stands during 1996 - 2005 and the spatial information on stand classification with 10-m grid digital elevation model. We calculated the mean dominance and density of trees with DBH > 5 cm, which were 30.7 m~2ha~(-1) and 792 individuals ha~(-1), respectively. Juveniles (Height > 1.3 m and DBH < 5 cm) had a mean density of 561 individuals ha~(-1). An asymmetric and peaked distribution was observed in tree and juvenile density. The predominant tree species included Sakhalin fir (Abies sachalinensis), Yezo spruce (Picea jezoensis), Japanese linden (Tilia japonica), and painted maple (Acer mono). An inverse J-shaped diameter distribution was maintained in tree density. Selection stands were mostly located on anarea between 300 - 600 m a.s.L
机译：选择林是由年龄不一的造林系统管理的森林，在该系统中，定期从大片区域定期清除树木。选择系统已用于管理日本北部北海道的天然林。这项研究证明了北海道中部自然选择森林的特征。在东京大学北海道森林大学进行了案例分析，以仔细检查选拔林的结构和地理。我们使用了1996年至2005年在精选林中建立的1,382个样地，并使用10米网格数字高程模型进行了林分分类的空间信息。我们计算了DBH> 5 cm的树木的平均优势度和密度，分别为30.7 m〜2ha〜（-1）和792个人ha〜（-1）。少年（身高> 1.3 m，DBH <5 cm）的平均密度为561个个体ha〜（-1）。在树木和幼虫密度中观察到不对称和峰值分布。主要的树种包括萨哈林杉（Abies sachalinensis），云杉野叶云杉（Picea jezoensis），日本菩提树（Tilia japonica）和彩绘枫树（Acer mono）。树木密度保持J型倒数分布。选拔站大多位于a.s.L. 300-600 m a。

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