[en]+[zh]Study on Forest Landscape Restoration - ITTO

9 Analysis of characteristics of degraded and secondary forests and restoration strategies 229
Community
( continued)
Stand d<strong>en</strong>sity
Volume
Forest average average
storey DBH(cm) H(m) D<strong>en</strong>sity Perc<strong>en</strong>tage Volume Perc<strong>en</strong>tage
(N/ha) (%) (m 3 /ha) (%)
Community 3 Arbor storey 13.16 13.39 2321 100 199.44 100
Sub storey I 16.79 14.62 1200 51. 70 183.17 91. 38
Sub storey IT 7.52 6.83 1121 48.30 17.27 8.62
Community 4 Arbor storey 14.30 8.50 2925 100 195.12 100
Sub storey I 24.06 10.29 600 20.51 130.94 67.11
Sub storey IT 10.74 6.18 2325 79.49 64.18 32.89
9.1. 5 DBH distribution
As shown in Table 9. 4 and Figure 9. 1, the DBH distribution range of degraded
primary forests was 4 - 48 cm and the maximum diameter was 46. 30 cm.
The number of trees in diameter class 4cm didn't include trees with DBH of
2 - 4. 9cm, so the number of trees in diameter class 4cm was lower than that
of diameter class 8cm significantly. The DBH distribution of each degraded
primary forest community showed the inverse J shape.
Table 9.4 The DHB distribution of degraded primary forests
Diameter class
The number of trees in each diameter class (n)
(cm) Community 1 Community 2 Community 3 Community 4
4 20 17 11 11
8 35 48 36 37
12 24 21 30 23
16 10 7 12 14
20 6 6 5 7
24 3 2 4
28 0 3
32 0 0 2 2
36 0 0 0
40 0 0 0
44 0 0 0
48 0 0 0