FACTORS AFFECTING THE CHANGE IN RATE OF WATER ABSORPTION BY SHOOTS OF CRYPTOMERIA JAPONICA WITH RESPECT TO THE EXPOSURE TO ARTIFICIAL WIND

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1. Change in the rate of water absorption of shoots of Cryptomeria japonica when exposbd to wind was measured by potometer in experimental room conditions.
2. It needed an adjustment period before the steady absorption rate conditioned by wind was attained, and there could be found three types in the phange of absorption rate of that period, i.e., the initial rate before steady rate for wind is (a) higher than, (b) equal to, and (c) lower than the latter.
3. Among these three types, , type-(a) occurred more frequently with lower water contents and higher absorption rate for calm air conditions, type-(c) with conditions reverse to (a), and type-(b) with intermediate of other two.
4. These three types are supposed as resulting from the difference in the resistance to the transmission of effects of water deficit from transpiring leaves to absorbing surface, which is conditioned by the water relations in plant body.
The writer is grateful to PROF. DR. NAKAMURA KENTARO^* for his guidance and criticism during this study, and also to Ass. PROF. M. ONSI MASAMI^* for his kindness in reading the original manuscript.