Forest dynamics during 8 years at the three monitoring plots for long-term forest dynamics in the Shiiba Research Forest
2017
Ogata, T. (Kyushu University (Japan). Faculty of Agriculture, Shiiba Research Forest) | Hishi, T. | Tashiro, N. | Enoki, T. | Utsumi, Y. | Kaji, K. | Cho, K. | Yamauchi, K. | Kubota, K. | Kabemura, Y. | Inoue, S. | Shiiba, Y. | Mabuchi, T. | Nagasawa, H. | Murata, I.
Three 1 ha monitoring plots, which had named as Kasebaru, Maruju and Hirono, were established at different locations in Shiiba Research Forest. At these plots, the forest dynamics have been monitored under the plan lasting more than 100 years. During 8 years from the starting monitoring, stem densities decreased, and total basal area and total biomass stock increased at the all three plots. Average annual increments of total biomass were 3.3, 3.9 and 7.1 Mg/ha/yr, with the mean of 4.8 Mg/ha/yr, at Kasebaru, Maruju and Hirono, respectively. The decline in stem density was mainly due to mortality of the individuals which have less than 20 cm in stem diameter. The number of recruitment individuals with >15cm in girth at breast height was less than that of dead individuals with >15cm in girth at breast height at the all plots. During the 8 years, species composition and diversity index were not changed at the all plots. The long-lasting decline of small trees may result in the decline of forest biomass and productivity.
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