Table 2.
Structural properties of uphill (n = 15) and downhill (n = 37) branches of the ten C. crenata trees sampled
| Mean | |||||
| Branch properties | Uphill | Downhill | Statistics* | Methods of tests | |
| Branch length (m) | 5·2 | 5·2 | tS = 0·0605 (N.S.) | d.f. ≈ 21·12 | Welch’s t‐test |
| Branch spread (m) | 3·1 | 3·0 | tS = 0·138 (N.S.) | d.f. ≈ 20·72 | Welch’s t‐test |
| Branch angle to vertical (°) | 40·8 | 43·4 | TR = 383 (N.S.) | Wilcoxon rank sum test | |
| Branch‐tip height† (m) | 2·2 | 2·2 | t = –0·107 (N.S.) | d.f. = 50 | t‐test |
| Branch base position‡ (m) | 6·2 | 6·1 | TR = 390 (N.S.) | Wilcoxon rank sum test | |
| Proportion | |||||
| Number of branches | 15/52 | 37/52 | u = 2·91 (P < 0·05) | Test of significanceof deviation froma binomial proportion of 1/2 | |
*tS, Welch’s t ‐value; TR, Rank sum for smaller samples (= uphill branches); u, one‐tailed normal probability calculated from the number of uphill and downhill branches.
†Height of the tip of a primary branch expressed as the distance from the top of the tree.
‡Position of the branch base on the main trunk expressed as the distance from the top of the tree.