1. Rationale
2. Objectives
4. New findings
CHAPTER 1
LITERATURE REVIEW
1.1. Some concepts of essential oils
1.1.1. General concept of an essential oil-bearing plant
1.1.2. Concept of essential oils
1.2. Studying essential oil-bearing plants
1.2.1. Research on essential oil-bearing plants in the world
1.2.2. Research on essential oil plants in Vietnam
1.3. Research on chemical composition of essential oil in the world and in Vietnam
1.3.1. Research on the chemical composition of essential oil in the world
1.3.2. Research on chemical composition of essential oil in Vietnam
1.3.2.1. Study on chemical composition of essential oil of Camphor (Lauraceae)
1.4. The natural, socio-economic conditions of Vu Quang National Park
CHAPTER 2
OBJECTIVES AND RESEARCH METHODS
2.1. Subjects and Research locations
2.2. Time conducted for the research
2.3. Research content
2.4. Research methodology
2.4.1. Researching from secondary survey
2.4.2. Methodology of field investigations and surveys
2.4.3. Methods of sampling and classification
2.4.4. Methods to assess the diversity of the flora
2.4.5. Collect samples and distill essential oil
2.4.7. Methods of analyzing chemical composition of essential oils
2.4.8. Method of data processing
CHAPTER 3
RESEARCH FINDINGS AND DISCUSSION
3.1. Diversity of essential oil plants in Vu Quang National Park
3.1.1. Diversity in phyla and classes
Phylum
3.1.2. Diversity in families
3.1.3. Diversity of genera
Essential oil-bearing plant species in Vu Quang National Park belong to 145 genera. In particular, the number of species distributed in the genera is uneven. There are 17 genera accounting for 11.72% of the total number of genera, but there are 164 species accounting for 44.81% of the total species. The number of genera with the number of species less than 5 is 128 genera (accounting for 88.28%), with a total of 202 species accounting for 55.19%. The genera with species which produce more essential oils are Litsea with 25 species, Cinnamomum with 21 species, followed by Alpinia – 13 species, Piper and Fissistigma with 11 species and Syzygium – 10 species. The remaining genera have the number of species ranging from 5 to 9.
3.1.4. Comparing composition of essential oil plants in Vu Quang National Park with that of Pu Mat National Park
- Compare with Pu Mat National Park
3.1.5. Diversity in trunk form
The table above shows that the herbaceous group has the largest number of species with 108 species, accounting for 29.51% of the total number of species, this type is found mainly in species of families such as Asteraceae, Lamiaceae, Ginger (Zingiberaceae), Apiaceae, Araceae, Rice (Poaceae). The second most popular group is trees with large woody trunk with 102 species, accounting for 27.87% of the total number of species distributed in families such as Podocarpaceae, Magnolia (Magnoliaceae), Camphor (Lauraceae), Euphorbiaceae, Myrtaceae. Trees with small woody trunks are mainly found in some representatives from Camphor family (Lauraceae), Verbena (Verbenaceae), Myrtaceae, Orange (Rutaceae), Annona(Annonaceae). Liana with 46 species, accounting for 12.57% concentrated in the Annona (Annonaceae), Pepper (Piperaceae), Jasmine (Oleaceae), Orange (Rutaceae). The least popular type is shrubs with 31 species, accounting for 8.47%, mainly from the Myrtaceae family, Verbena (Verbenaceae), Orange (Rutaceae) Euphorbias (Euphorbiaceae), Ginseng (Araliaceae), Annona (Annonaceae), etc. Thus, the main type of the essential oil-bearing species is the herbaceous plant which is a group of plants that grow and develop quickly. Their life span is short but they produce large biomass. Therefore, these findings contribute to the orientation for planting, exploiting and using plant resources for essential oils effectively.
3.1.6. Diversity of usage value
3.1.7. Diversity of geographical factors
3.1.8. Diversity of rare and precious genetic resources
Scientific names
Vietnamese names
According to Decree 06/2019, 12 species were identified, belonging to 9 genera of 8 families distributed in Vu Quang National Park, Ha Tinh
3.1.9. Description of the biological characteristics of the species analyzed
3.2. The chemical composition of essential oils analyzed at Vu Quang National Park
3.2.2. Magnoliaceae family
The chemical composition of the essential oil of Manglietia Dandyi (Manglietia dandyi)
3.2.3. Ginger (Zingiberaceae)
CONCLUSIONS AND RECOMMENDATIONS
1. Conclusion
2. Recommendations