Germination timing and seedling mortality in a cutting area of deciduous broad-leaved forest
1990
Komiyama, A. (Gifu Univ. (Japan). Faculty of Agriculture) | Yano, N. | Waki, K.
Seasonal patterns of mortality and germination / sprouting were studied for broad-leaved tree species in a new cutting area. In 1987 and 1988, the 32 tree species emerged in a 20 centiare area. In each tree species, the time of emergence individually fluctuated over several months. But they had a specific peak time of germination in a season. Phellodendron amurense and Styrax japonica were among the early group and germinated in May and June, while Rhus chinensis and R. trichocarpa were of the late group and germinated in July and August. Only the peak time of Ulmus Davidiana showed some yearly fluctuation between 1987 and 1988. From the analyses by survivorship curve, the seedling number decreased significantly just after germination. The earlier the germination in a season, the lowest the mortality of population tended to be. The survivorship curve of sprout population showed a gentle decrease throughout the year. However, the populations sprouting later in a season showed a higher mortality. The influences of emergence timing on population mortality were discussed in relation to plant growth
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