近畿大学奈良キャンパス里山林生態観測プロットの林分構造

概要

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A large-scale ecological research plot （2.85 ha） was set up in satoyama forest of the Nara Campus, Kinki University to investigate the tree population structure in suburban secondary forest. All stems equal or larger than 5 cm in diameter at breast height were identified, and their species, locations, heights and diameters were recorded in 2.04 ha of the plot area in 2007. A total of 40 species were identified in 3549 stems observed. The total basal area was 33.7 m^2/ha and the canopy layer was taller than 15m. These measurements suggested that this forest has nearly reached its mature phase. The sum of basal areas of deciduous species was larger than that of evergreen broad-leaved species. Clethra barvinervis had the highest population density. Although Quercus serrata occupied 42.4％ of the total basal area and was the most dominant species, it had an unstable population structure. The climax species, Castanopsis cuspidate, had low population density and occurred in a limited area. This indicated there was little possibility that the population of C. cuspidate would increase rapidly. In the shrub layer, the evergreen broad-leaved and shade-tolerant species, Eurya japonica and Ilex pedunculosa were dominant.