Abstract
Many workers have observed that calcium is accumulated in the leaves in the midnight. The author also observed that calcium increased in the leaves and decreased in the stem of the seedings of Yachidamo in the midnight. These results, however, have showed only the diurnal variations of the total calcium. Many workers have never observed the diunal variations of the fractionalized calcium.
In order to study the calcium metabolism in the trees, the author has adopted the method which investigates the variations of the fractionalized calcium. This experiment was planned with using the poplar cuttings for studing the diurnal variations of fractionalized calcium.
On 14th July, 1963 the preliminary experiment was planned and on 15th, 25th May, and on 4th June, 1964 the proper experiment was done. These showed almost the same results. The present paper reports the results of 4th June, 1964.
1. In the leaves, calcium increased in the midnight and decreased in the daytime. In the fractionalized calcium, H2O ext. parts decreased, NaC1 ext. parts increased in the midnight, CH3 CO2 H ext. and HC1 ext. parts die not affect of the diurnal variations.
2. In the barks, calcium decreased in the midnight and increased in the daytime. In the fractionalizad calcium, H2O ext. parts increased, CH3CO2H ext. parts decreased in the midnight.
3. In the wooden parts, calcium contents did not affect diurnal variations.
4. Summarizing the above results, it is presumed that calcium moves alternately from leaves to barks and from H2O ext. parts to NaC1 ext. and CH3CO2H ext. part with the diurnal variations.
