京都府南部における広葉樹二次林の構造と5年間の林分動態

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Forest structure and dynamics were studied during 1994-1999 in a large permanent research plot (1.7ha) in a temperate broad-leaved secondary forest in Yamashiro Experimental Forest, central Japan. The forest had been established on bare land following reforestation in the late 19^<th> century. The stratification of the stand based on the M-w diagram, drawn using mean tree weight (M) and individual tree weight (w), was composed of three layers. The number of stems and leaf biomass were most heavily concentrated in the third (lowest) layer, while the first and second layers of the stand were poorly developed. The forest was therefore judged to be immature. The density and above-ground biomass in the first layer increased markedly during the 5-year census period, indicating that the forest is still developing and that the species composition and stratification of the stand are not stable. The high density and leaf-biomass in the third layer suggested that intra- and interspecific competition was strongest in this layer. The mortality and recruitment rates of the stand were 3.85% year^<-1> and 2.26% year^<-1> respectively, i.e. within the range of the corresponding values estimated for various temperate old-growth forests in Japan despite considerable differences among stand structures. The mortality rates of some early successional species such as Alnus pendula and Rhus trichocarpa substantially exceeded the recruitment rates, while that of Quercus serrata, the dominant deciduous species in the stand, was low. Because Q. serrata was represented by many saplings and was recruited substantially into the upper layers, this species is expected to maintain dominance for the time being. On the other hand, Q. glauca, an evergreen broad-leaved species, may be one of the leading candidate dominant species in the first layer because of its low mortality and rapid growth rate.
日本生態学会の論文
2004-08-25

京都府南部における広葉樹二次林の構造と5年間の林分動態

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