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Distribution pattern and age structure of Abies firma saplings in a mature mixed forest of A. firma and Fagus japonica
Author(s) -
Agetsuma Naoki
Publication year - 1992
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/bf02347105
Subject(s) - japonica , botany , age structure , spatial distribution , japonica rice , distribution (mathematics) , geography , forestry , biology , mathematics , population , demography , mathematical analysis , remote sensing , sociology
Age and spatial distribution of Abies firma saplings were analyzed in a mature mixed forest of A. firma and Fagus japonica . There were two major peaks in the age structure of Abies saplings at around 10 and 75 years of age. Distribution of these age classes of saplings was contagious, while that of all saplings was approximately random. These facts showed that most of the establishment of A. firma occurs just after a gap is formed, and the frequency at which such establishment occurs is about once every 60 years in a 1600 m 2 area.