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

230 <strong>Study</strong> on Forest Landscape Restoration
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Diameter Class (cm)
Figure 9. 1
The DHB distribution of degraded primary forests
9.2 Characteristics of secondary forest
9.2.1 Dominant species
Importance value of plants in arbor storey of secondary forest in Dagan demonstration
area was shown in Table 9.5. Relative dominance was calculated u­
sing Ground Diameter other than DBH for theimportance value calculation of
community Symplocos laurina- Radermachera hainan<strong>en</strong>sis and community Lithocarpus
pseudovestitus. There were totally 25 tree species in arbor storey of
community Aporosa chin<strong>en</strong>sis. The importance value of Aporosa chin<strong>en</strong>sis was
60.32% , which was the biggest one. Followed by Lithocarpus corneus and
Garcinia oblongifolia, the importance values were 23.58% and 22.38% respectively.
The importance values of Liquidambar /ormosana, Lithocarpus
howii, Artocarpus tonkin<strong>en</strong>sis, Castanopsis hainan<strong>en</strong>sis, Syzygium buxifolium,
Ormosia pinnata, Ellipanthus glabrifolius and Sapium discolor ranked 4 - 11
respectively while those of other 14 species were less than 10%. There were
totally 6 tree species in arbor storey of community Trema tom<strong>en</strong>tosa and species
Trema tom<strong>en</strong>tosa had the biggest importance value, which was up to '
195.09%. The importance values of Indigo/era galegoides, Helicteres hirsuta,
Ellipanthus glabrifolius, Evodla meliaifolia and Aporosa chin<strong>en</strong>sis decreased in
turns. There were totally 12 tree species in arbor storey of community Symplocos
laurina- Radermachera hainan<strong>en</strong>sis. The important value of Symplocos