The forest of Cryptomeria japonica planted in the spring of 1904, shows marked differences in the physiological and ecological characters of the trees, as well as in the appearance of its surface flora, due to the difference of its site. As concrete representatives of particular sites, we took three plats that were named A, B and C, indicating respectively the greatest, the moderate, and the smallest growth. Upon the trees in the upper layers in these plats, we employed chiefly the autoecological and upon the surface flora the synecological investigations.
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