Gap-phase structure of a subalpine old-growth forest
Gap-phase structure of a subalpine old-growth forest
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DOI：
10.1139/x91-239
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发表时间：
1991-12
影响因子：
2.2
通讯作者：
K. Lertzman;C. Krebs
中科院分区：
文献类型：
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作者：
K. Lertzman;C. Krebs
我们检查了不列颠哥伦比亚省西南部海岸山脉亚高山原始森林中的四个林分的间隙相结构。尽管林分中每个物种的比例有所不同，但所有林分的封闭冠层和间隙面积分布相似（总体意味着：29% 封闭冠层，52% 扩大间隙，18% 冠层间隙）。冠层间隙和扩大间隙的中位面积分别为 41 平方米和 203 平方米。大多数缺口（90%）都有多个缺口制造者，而缺口内的缺口制造者通常来自时间上分离的死亡事件。所有间隙制造者中有一半是站着死亡的，只有 13% 是被风吹倒的。太平洋银杉 (Abiesamabilis (Dougl.) Forbes) 在间隙制造者中所占的比例比一般树冠树木中的比例要高得多 (64% vs. 45%)。估计的森林周转时间从 280 年到 1000 年不等，具体取决于对填补空白所需时间的假设。该森林间隙相结构和动态的显着特征是间隙面积比例高，小...
We examined four stands in a subalpine old-growth forest in the Coast Mountains of southwestern British Columbia for gap-phase structure. Though the stands varied in the proportions of each species, all had a similar distribution of area under closed canopy and in gaps (overall means: 29% closed canopy, 52% expanded gap, 18% canopy gap). Median areas of canopy gaps and expanded gaps were 41 and 203 m2, respectively. Most gaps (90%) had more than one gap maker, and gap makers within a gap were often from mortality events separated in time. Half of all gap makers died standing, and only 13% were windthrown. Pacific silver fir (Abiesamabilis (Dougl.) Forbes) was represented among gap makers in a much higher proportion than among canopy trees in general (64 vs. 45%). The estimated forest turnover time varied from 280–1000 years, depending on assumptions about the time taken for gaps to be filled. Distinctive features of gap-phase structure and dynamics in this forest are the high proportion of area in gap, sm...