Stand structure and long-term dynamics of primeval forests in Nakagawa Experimental Forest, Hokkaido University [Japan]
1995
Hiura, T. (Hokkaido Univ., Sapporo (Japan). Faculty of Agriculture) | Fujiwara, K. | Hojyo, H. | Okada, J. | Udo, H. | Okuyama, S. | Morita, H. | Fukuta, H. | Fujito, E. | Fukui, T. | Takahata, M. | Arikura, K. | Sugiyama, H. | Takeda, T.
Community structure and dynamics of primeval boreal mixed forests in Nakagawa Experimental Forest was investigated by using the 15.5 ha, 15 year-census data. We found 25 tree species, and Abies sachalinensis, Picea jezoensis, Quercus mongolica, Sorbus commixta, Acer mono, and Kalopanax pictus dominated in the plots. Initial species diversities were 1.03-2.20 (H'), then its values slightly increased during 15 years. Basal area densities were 7.86-49.43 square-meter/ha at each plot. Frequency distribution of diameter at breast height of conifer and hardwood species showed bell- shaped and L-shaped, respectively. The frequency distribution of conifer species was almost stable except the minimum size class, while individual number of hardwood species monotonically increased in each size class. The basal area densities larger, the slope of a distribution density function more gentle. It suggested that there was negative density dependence between canopy tree density and suggested that there was negative density dependence between canopy tree density and recruitment rate. Average mortality rate was 0.45%/yr, and the corresponding turnover time was 222 years
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