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Table 1 Numbers, sex ratio and DBH of Torreya nucifera trees in the three sites of Torreya Forest in Jeju Island (adapted from Kang and Shin 2012)

From: Spatial distribution patterns of old-growth forest of dioecious tree Torreya nucifera in rocky Gotjawal terrain of Jeju Island, South Korea

Site Plot ID Altitude (m) Area (ha) Sex Sex ratio Density Mean DBH (cm)
Males Females
I 3 148 6.4 235 167 0.58 ** 62.8 58.9 ± 20.6
4 154 1.5 16 11 0.59 NS 18.0 40.5 ± 20.6
5 145 7.1 268 165 0.62 *** 61.0 61.7 ± 19.4
Mean      0.60 *** 57.5 59.7 ± 20.4
II 2 140 6.8 304 293 0.51 NS 87.8 54.2 ± 16.4
6 144 5.3 194 200 0.49 NS 74.3 56.2 ± 15.9
7 141 4.7 165 160 0.51 NS 69.2 45.0 ± 16.9
Mean      0.50 NS 78.3 52.5 ± 17.0
III 1 130 4.0 64 47 0.58 NS 27.8 46.2 ± 21.7
8 129 1.3 23 64 0.26 *** 66.9 57.0 ± 19.0
9 128 1.3 18 21 0.46 NS 30.0 44.4 ± 17.1
10 131 3.9 211 235 0.47 NS 114.7 39.4 ± 21.1
Mean      0.46 (*) 65.0 43.0 ± 21.5
Overall mean    0.52 * 67.6 52.4 ± 20.1
  1. Sex ratio = male/(male + female); Density = trees/ha; DBH diameter at breast height
  2. (*) P = 0.0510; * P < 0.05; ** P < 0.01; *** P < 0.0001; NS not significant