GAP-PHASE STRUCTURE OF A SUB-ALPINE OLD-GROWTH FOREST

被引:118
作者
LERTZMAN, KP [1 ]
KREBS, CJ [1 ]
机构
[1] UNIV BRITISH COLUMBIA,DEPT ZOOL,ECOL GRP,VANCOUVER V6T 2A9,BC,CANADA
来源
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE | 1991年 / 21卷 / 12期
关键词
D O I
10.1139/x91-239
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
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 (Abies amabilis (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, small gap size, multiple gap makers of varying stages of decay, and long tenure of gaps before they are filled.
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页码:1730 / 1741
页数:12
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