Regeneration process of broadleaved trees in planted Larix kaempferi forests
2006
Hanada, N.(Hokkaido Univ., Sapporo (Japan)) | Shibuya, M. | Saito, H. | Takahashi, K.
To examine the regeneration process of broadleaved trees in planted larch, (Larix kaempferi) forests, we investigated stand structures, species compositions and age distributions of broadleaved trees related to thinning histories, and species compositions of buried viable seeds in six planted larch forests located in the southern part of the Ishikari lowlands in Hokkaido, northern Japan. Density of broadleaved trees was lower in planted larch forests with dense sasa (Sasa spp.), and it was assumed that sasa inhibited the regeneration of broadleaved trees in planted larch forests. It was also assumed that thinning positively influenced the regeneration of broadleaved trees in the plantations, because the density of the trees increased after thinning. The number of species of broadleaved trees increased stepwise with thinning, and especially, the number of gap-dependent species markedly increased after the first thinning in the planted larch forests. Species composition of buried viable seeds was not similar to species composition of broadleaved trees. It was guessed that the seeds contributed little to the regeneration of broadleaved trees in planted larch forests, and yet more detailed examination of buried viable seeds in will be needed. Consequently, it was concluded that sasa negatively influenced the regeneration of broadleaved trees, and that thinning increased both density and species diversity of the trees in planted larch forests. Furthermore, it was suggested that the timing of the regeneration and species composition of broadleaved trees in planted larch forests are closely related to regeneration habits of the trees.
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