On the characters of Sequoia sempervirens Seedling obtained from Seeds introduced from California (2)

Abstract

The writer (1958) has reported that the seedlings of S, semp obtained from seeds produced in California have the high hybrid population and this strain may be considered as an apporopriate material for purposes of the selection. The present paper is dealt with the statistical analysis on the characters of the branch of trees belonging to the above strain. Twelve individuals of 3-4 year old seedlings were examined. This material group showed the high variability coefiicient similar to those of the previous paper. There was the significant difference at I or 5 % level between the characters of each tree. The distance between the successive branches on the stem varied with the branch position on the stem, while there was any regular correlation between the distance and the branch position on the stem. Therefore, method expressing the number of the branch on the stem may be worthy of consideration. An angle of the branch at the upper position of a crown, near the center, and at the lower one was an acuter, an average value, and a blunter, respectively. However, its deviation could be ignored. The number of sub-branches varied with the parts of insertion of branch and no correlation was detected between the both. Positive correlation coeffilcient at the l%-level significance was recognized between the number of sub-branches and the length of the branch; and between the diarneter and the length of the branch. In the height of tree and the diameter of a crown the high positive correlation was seen between the total increment during 3 years from 1951 to 1953 and during 4 years from 1951 to 190r4. The correlation coefiicient between the total inctement of the tree height, the crown diameter, and the stem diameter at 10 cm above ground and some characters of the branch is given in the table 6. In the preceding paper the after effect of seed activity was described, in which, there was no significant correlation coefficient between the total increment of tree height, the crown diameter, and the stem diameter during 3 years (1951 to 1953) and the increment of such characters during 1 year in 1954. On this hybrid population, the size of the sample required for the expected standard deviation concerning the each character was measured. In the present paper the writer discussed the method of measuring some of the characters giving the peculiarity of these characters and the size of the sample consideration.