アカマツ単木の成長経過に関する基礎的研究

The purpose of the present study is to show the past growth curves of Akamatsu trees. In this experiment, the method of stem analysis is used.
The method of stem analysis is accurate and a good method of determing the past growth of individual trees.
For each sample tree, the growth in height, D. b.h., Area b.h. and volulme are calculated.
The results are shown in Table 1-4. Fig 2 and 3 show the relation between current annual growth and mean annual growth in height, D. b.h. and volume. Fig 1 is an illustration in graphic form of sample tree (No.1).
In general, there is a definite the relation between the curves of current annual and mean annual growth.
The curves of current annual growth shows the typical shape, and mean annual growth shows the typical slow.
After the current annual growth equals the mean annual growth, the curves of mean growth is reduced slowly by an added year.
The two curves cross at a point of the mean annual growth, but in this experiment, two curves cross two or three times. It will be due to the infiuence of cilmatic or other factors.
The curves of current growth in height reached its crest and starts to fall in 10-25 years, and mean growth reached its crest and starts to fall in 25-30 years.
The curves of current growth in D. b.h. reached its crest in 15 years, and mean growth reached its crest in 20-35 years.
The curves of current growth in volume reached its crest in 35-40 years and mean growth will be reached its crest in 50 years.