Spherical densiometers produce biased estimates of forest canopy cover

被引：3
|
作者：
Cook, JG [1 ]
Stutzman, TW [1 ]
Bowers, CW [1 ]
Brenner, KA [1 ]
Irwin, LL [1 ]
机构：
[1] NATL COUNCIL PAPER IND AIR & STREAM IMPROVEMENT IN, NEW YORK, NY 10016 USA
来源：
WILDLIFE SOCIETY BULLETIN | 1995年 / 23卷 / 04期
关键词：
canopy cover; densiometer; vegetation measurement;
D O I：
暂无
中图分类号：
X176 [生物多样性保护];
学科分类号：
090705 ;
摘要：
We assessed suitability of convex and concave densiometers for measuring forest canopy cover in uneven-aged mature and selectively harvested grand fir-western larch (Abies grandis-Larix occidentalis) forests in northeast Oregon. Cover estimates from both instruments were similar, overestimated cover substantially, and were insensitive to substantial variations in forest cover. Spherical densiometers are not suitable for estimating forest cover for most applications in forest ecology and management. Precision of instruments with minimal bias, however, is relatively low. Workers should plan for greater sample sizes to achieve adequate precision if unbiased instruments or techniques are used to measure canopy cover.
引用
收藏
页码：711 / 717
页数：7
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