Occurrence pattern of Thujopsis dolabrata var. hondai saplings as related to their layering in a Quercus mongolica var. grosseserrata and T. dolabrata var. hondai forest in Ohshuku district of Iwate Prefecture

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Occurrence pattern of hiba (Thujopsis dolabrata var. hondai) saplings in a Quercus mongolica var. grosseserrata and T. dolabrata var. hondai forest was examined in connection with their layering property and the spatial distribution of deciduous broad-leaved trees. Density of hiba saplings (height<200 cm) was 22, 000 ha-1 but extremely low for those more than 100 cm. Although ratio of saplings generated from layering was obtained by the underground survey to be 14%, it was assumed that the ratio would have been much higher since the other saplings also had long buried-stems. Relative photon flux density on the stand floor was around 10% or more than 15% beneath the canopy of deciduous broad-leaved trees, while less than 5% beneath the canopy of hiba trees. The saplings were distributed more densely beneath the canopy of deciduous broad-leaved trees, in which the layering was found more often. The saplings formed small-sized clumps less than 1 m2 in area and large-sized clumps around 100 m2. It was concluded that the small clumps would be associated with the layering and the large ones with the spatial distribution of the deciduous broad-leaved trees.
日本森林学会の論文