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Intense effects of early Historic (Tumulus) man upon vegetation about 1,500-1,600 years ago'-4' might be expected to have changed dramatically the pollen assemblages of the late postglacial period in Japan. However, if pollen assemblages are expressed by percentage values they may not record the extent of forest disturbance, because change in abundance of one type causes changes in the percentage values of all others5 , 6' . In particular, great pollen producers exert major influence on all others, whereas parallel changes of perhaps more significant species or genera do not alter the percentage values from level to level. Data represented by absolute pollen values may overcome this difficulty. With this purpose in mind, I have been able to construct an absolute pollen diagram from late postglacial sediments of Lake Nojiri (654 m alt.; 36°49'N Lat., 138°13'E Long.) in central Japan.

Late Postglacial Absolute Pollen Diagram in Lake Nojiri