Table 4.

Summary of the size information and the statistics for field-measured large old Z. serrata trees.

Tree no.	Estimated age (year)	DBH (cm)	Height (m)	Crown width (m)
1	331	132.5	15.4	S.N. 23.3/E.W. 20.8
2	151	106.0	11.0	S.N.12.3/E.W. 13.5
3	131	118.5	16.7	S.N.22.0/E.W.23.5
4	319	184.0	13.7	S.N. 13.4/E.W. 9.6
5	229	165.5	12.4	S.N. 14.0/E.W. 10.0
6	231	175.0	12.9	S.N. 19.4/E.W. 25.1
7	231	169.5	13.6	S.N. 26.0/E.W. 16.6
8	416	161.0	19.6	S.N. 20.8/E.W. 23.3
9*	394	130.0	18.1	S.N.20.0/E.W.19.8
10*	376	124.0	16.6	S.N.16.2/E.W.20.4
11	359	104.0	16.2	S.N. 12.6/E.W. 15.5
12	189	143.5	10.7	S.N. 24.3/E.W. 24.2
13	151	141.5	17.7	S.N. 24.6/E.W. 23.0
14	89	109.5	15.7	S.N. 22.5/E.W. 21.3
15	89	124.0	16.2	S.N. 15.0/E.W. 18.0
16	239	151.7	14.4	S.N. 11.9/E.W. 11.3
17	220	102.0	11.9	S.N. 12.4/E.W. 11.3
18*	300	98.0	13.2	S.N. 14.2/E.W. 12.0
19	200	112.0	10.2	S.N. 11.0/E.W. 10.0
20	250	181.0	14.1	S.N. 13.0/E.W. 15.0
21	188	91.5	12.1	S.N. 13.7/E.W. 13.1
22	468	177.5	12.4	S.N. 15.4/E.W. 15.6
23	539	252.5	16.1	S.N. 22.4/E.W. 22.2
24	539	187.5	10.9	S.N. 14.5/E.W. 15.5
25	219	153.5	17.0	S.N. 20.1/E.W. 22.5
Mean ± SD	274 ± 127.3	143.8 ± 37.6	14.4 ± 2.6	S.N. 17.4 ± 4.8/E.W.17.3 ± 5.1
Min.-Max.	89.0–539.0	91.5–252.5	10.2–19.2	S.N. 11.0–26.0/E.W. 9.6–25.1

SD, min, and max stand for the standard deviation, minimum, and maximum, respectively, DBH diameter at breast height, S.N South-North, E.W. East–West, Estimated age = The mean age of large old Z. serrata was indirectly estimated based on the age information described on the on-site board of protected Z. serrata.

*Estimated by applying the DBH estimation formula and the coefficient of Z. serrata calculated by Son et al.⁴⁹.