Na Hang Nature Reserve, Tat Ke Sector - Frontier-publications.co.uk

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Na Hang Nature Reserve, Tat Ke Sector 1997 5.0 VEGETATION SURVEY 5.1 Introduction Previous studies of the vegetation of the Na Hang nature reserve have included work by Dang Huy Huynh et al.(1993), Cox (1994) and an SEE-Vietnam expedition in January to March 1996 (Hill and Kemp, 1996). All have indicated the importance of the forest at Na Hang on a regional and national scale. The latter is the most complete study of Na Hang's vegetation to date. However, work was restricted to the Southern (Ban Bung) sector of the reserve, with no work being carried out in the Tat Ke sector. The aims of this, the second SEE investigation within the Na Hang reserve, were to describe and map major vegetation types, and record species present in the Tat Ke sector in order to supplement the existing data and provide contrasts to the investigations already carried out within the Ban Bung sector of the reserve. Since forest vegetation types dominate in this part of the reserve (as at Ban Bung), detailed vegetation studies were restricted to forest areas. 5.2 Methods Four sites were chosen to represent a variety of forest habitats present in the sector, which can be classified as described by Nakashizuka and Yusop (1993, for Peninsular Malaysia); • FT1 Primary transitional (lowland/lower montane) rainforest, 695m asl. • FT2 Secondary lowland rainforest, on limestone slope. 500m asl. • FT3 Primary lowland rainforest, in a steep limestone valley. 595m asl. • FT4 Primary lowland rainforest, on a wet slope, 680m asl. The positions of the four study sites are shown in Figure 5. At each study site, the following surveys were carried out; 1) Forest tree survey (all trees over 4.5m high) 2) Ground flora/sapling survey (herbs and trees under 4.5m). 5.2.1 Forest tree survey In each location, a plot 40m x 40m was marked. Within the plot, all trees (over 4.5m tall) were identified and the DBH (Diameter at Breast Height) of each tree measured. This allows the Basal Area of Wood (BA) to be calculated for each species and family. In addition, a 60m x 10m transect was laid out alongside the plot. Within the transects, each tree was identified to species. The following measurements were taken; DBH, trunk coordinates (position within transect), canopy extent, height of tree, Frontier-Vietnam Environment Research Report 9 10
Na Hang Nature Reserve, Tat Ke Sector 1997 height of base of canopy, point of inversion (height of lowest branch). These data were used to plot forest transect diagrams. 5.2.2 Ground flora and sapling survey Twenty 2m x 2m quadrats were laid out in a diagonal line across the plot (a total of 80m 2 , 5% of the plot area). Within each quadrat, the herbaceous species, shrubs and saplings under 4.5m were recorded. For each species, the number of individual plants and an estimate of percentage cover of the 2m x 2m quadrat were recorded. In addition, the proportion of each quadrat which was bare of vegetation was recorded. For the ground flora in each site, diversity was indicated by calculating Fisher's α. This measure of diversity takes account both the number of species (here, Recognisible Taxonomic Units or RTUs were used, as many of the taxa such as tree seedlings could not be identified to species level) and individuals in a sample (Fisher et al, 1943). Fisher's α is relatively free of bias when describing samples of differing size (see Magurran, 1988). 5.2.3 Ad lib. collection In addition to this detailed work on forest vegetation, plants were collected throughout the habitats represented at Na Hang, in order to compile as accurate a list as possible of the flora of the area and provide a contrast with the available lists for the Ban Bung sector. The habitat preferences of each species were recorded, along with details of any fertile stages present over the study period, and human utilisation of the plants. The plant species list for Tat Ke was largely compiled by Dr Tran Dinh Nghia. Frontier-Vietnam Environment Research Report 9 11
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Appendix 1. Habitat; Plants Plant s
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Species Habitat Fertile Uses/Status
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stages SONNERATIACEAE 638. Duabanga
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FOREST TRANSECT 1 Key: Ac Ao Ar Cl
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FOREST TRANSECT 3 Key: Cl Clusiacea
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Appendix 3. Forest plot data
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Myrtaceae 4 1.081 3.60 8 1.250 4.66
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Nymphalidae 32. Cethosia biblis Dru
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Appendix 4b. Butterflies recorded a
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1 2 3 4 5 25 Opsarichthys uncirostr
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Appendix 6. Amphibians and Reptiles
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A B C Upupipae: Hoopoe 14. Hoopoe (
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A B C Subfamily Muscicapinae: Flyca
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7b. Formulation used for the assess
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Appendix 8. Key; A Identified from:
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Appendix 9. List of specimens Insec
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