Change in the number ratio of overtopped trees in young sugi (Cryptomeria japonica D. Don) plantations
2015
Kunisaki, T.
The changes in the number ratio of overtopped trees over 17 years were investigated in an unthinned and a thinned plantation of young Sugi (Cryptomeria japonica D. Don). The number ratio of overtopped trees in the unthinned plantation increased with a decreasing relative spacing index of (Sr) <= 15.4%, and was estimated to be 8.4% in Sr=15%, 17.2% in Sr=13% and 31.6% in Sr=11%. In contrast, the number ratio of overtopped trees in the thinned plantation was estimated to be 1.9% in Sr=15%, 1.9% in Sr=13% and 7.7% in Sr=11%, and was much lower than that of trees in the unthinned plantation.
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