Size-specific mortality, growth, and structure of a Great Smoky Mountains red spruce population
作者:
Richard T. Busing,
Xinyuan Wu,
期刊:
Canadian Journal of Forest Research
(NRC Available online 1990)
卷期:
Volume 20,
issue 2
页码: 206-210
ISSN:0045-5067
年代: 1990
DOI:10.1139/x90-029
出版商: NRC Research Press
数据来源: NRC
摘要:
Old-growth population dynamics ofPicearubensSarg. were studied in a montane spruce–fir forest in North Carolina and Tennessee. Size-class structure fit a semilogarithmic rotated sigmoid curve typical of a stable population. Although the population contained trees of all ages, a large proportion of the population was less than 100 years old; few trees were greater than 350 years old. Mortality rates were estimated from a 2-decade census and from population structure data. For trees above breast height, annual mortality was approximately 1% of the population. Small trees (<30 cm dbh) and large trees (>60 cm dbh) had mortality rates exceeding 0.7% per year. Intermediate-sized trees tended to have low mortality rates (<0.5% per year) and high radial growth rates. Growth in the 10-year interval preceding death tended to be slow for standing dead trees. Standing death of canopy trees was more prevalent than death by windfall. These findings emphasized the influence of stand dynamics on spruce growth and mortality.
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