Influence of initial spacing and tree class on the basic density ofPicea abies
作者:
Kicki Johansson,
期刊:
Scandinavian Journal of Forest Research
(Taylor Available online 1993)
卷期:
Volume 8,
issue 1-4
页码: 18-27
ISSN:0282-7581
年代: 1993
DOI:10.1080/02827589309382752
出版商: Taylor & Francis Group
关键词: Quality;Norway spruce;plantation.
数据来源: Taylor
摘要:
The effects of initial spacing and tree class on the basic density of Norway spruce were evaluated in a stand on a fertile site in southwestern Sweden. The basic density at 0 and 4 m above ground level was significantly higher for trees planted with an initial spacing of 1.5 m than for trees planted with wider initial spacings. A decrease in initial square spacing from 2.5 m to 1.5 m had little effect, of small practical importance, on the basic density. The density at 0 and 4 m above ground was significantly higher for the suppressed trees than for the intermediate and dominant ones, and for the intermediate trees compared with the dominant trees. Differences in basic density appeared to be due mainly to differences in growth‐ring width. Basic density decreased outwards from the pith to the bark at 1.3 and 4 m above ground.
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