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  • 1
    Online Resource
    Online Resource
    Effect of Planting Method and Density on Initial Growth of Carya tonkinensis – a Multipurpose Tree
    Sciencedomain International ; 2019
    In:  Asian Journal of Research in Agriculture and Forestry ( 2019-03-12), p. 1-7
    Details
    In: Asian Journal of Research in Agriculture and Forestry, Sciencedomain International, ( 2019-03-12), p. 1-7
    Abstract: Carya tonkinensis Lecomte is a multipurpose tree species, naturally distributing in India, China, and Vietnam. Extract from leaves of C. tonkinensis contains pinostrobin acting as anti-bacteria and anti-infection. It is used as traditional medicine. Seeds are edible and contain oil. In addition, seed cover can be used to produce activated charcoal. Therefore, growing C. tonkinensis may contribute to poverty reduction in mountainous areas. This study aims to analyze suitable planting method and density for growing C. tonkinensis in Son La province, Northwestern Vietnam. Three treatments in planting method were considered: mixed planting of C. tonkinensis and Chukrasia tabularis, pure planting and scattered planting. Four treatments in planting density were considered: 625 plants/ha, 830 plants/ha, 1,000 plants/ha and 1,100 plants/ha. Stem height and stump diameter (Do) were measured at one year after planting, and death trees were counted for survival rate. The results indicated that scattered planting is the most suitable for C. tonkinensis and pure planting could also be applied. Meanwhile, planting density of 625 plants/ha (spacing of 4 × 4 m) and 830 plants/ha (spacing of 3 × 4 m) achieved the best performance. In both planting densities, the survival rate of the plants achieved 〉 90%, their growths were 〉 80 cm in height and 〉 0.8 cm in Do after planting one year. It is recommended that site preparation should be conducted by cutting bands of 2 m width and un-cutting bands of 2 m. In addition, seedlings of 〉 1-year old, which are taller than 0.6 m, should be used to ensure higher survival and growths of plants.
    Type of Medium: Online Resource
    ISSN: 2581-7418
    URL: Article
    DOI: 10.9734/ajraf/2018/v2i430023
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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  • 2
    Online Resource
    Online Resource
    Restoration of Degraded Natural Limestone Forests in Cat Ba Biosphere Reserves, Vietnam
    Sciencedomain International ; 2021
    In:  Annual Research & Review in Biology ( 2021-01-10), p. 14-26
    Details
    In: Annual Research & Review in Biology, Sciencedomain International, ( 2021-01-10), p. 14-26
    Abstract: Vietnam experienced significant forest cover change during the last half of the twentieth century, and restoration of natural forests have increased since the 1990s. This study developed comparisons of human-intervened and naturally restored forests in Cat Ba Biosphere Reserve, Vietnam in order to gain a better understanding of restoration options for the dual objectives of biodiversity conservation and forest cover. The overstory trees (species composition, growth, and diameter distribution) and natural regeneration (species richness, density, and height distribution) were measured and compared in twelve plots established in natural (NPS) and artificial restoration (RPS) models for post-selective-logged forest, and natural (NPC) and artificial restoration (RPC) models for post-clear-cut forest. Results indicated that the overstory trees and natural regeneration of RPS and RPC was higher than that of NPS and NPC. We concluded that the forest restoration models had shown successes, although extensive silvicultural techniques should be applied for a more stabilized development, especially in the RPC.
    Type of Medium: Online Resource
    ISSN: 2347-565X
    URL: Article
    DOI: 10.9734/arrb/2021/v36i230339
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    Medicinal Plant, Anoectochilus: Distribution, Ecology, Commercial Value and Use in North Vietnam
    Sciencedomain International ; 2020
    In:  Journal of Pharmaceutical Research International ( 2020-07-18), p. 84-92
    Details
    In: Journal of Pharmaceutical Research International, Sciencedomain International, ( 2020-07-18), p. 84-92
    Abstract: Background: Anoectochilus orchids have been widely used as medicine. However, it has been overharvested in nature because of high commercial values. This study aims at identifying distribution ranges and ecological characteristics of Anoectochilus orchids serving for sustainable development and describing traditional uses by ethnic people in Lai Chau Province, North Vietnam. Methods: Twenty-one plots of 100 m2 each (10 m × 10 m) were established for ecological survey and stand structures were analyzed for vegetation characteristics. While interviewing was applied to gather information on harvesting method, marketing, and medicinal uses. Results: Three Anoectochilus orchids (A. lanceolatus, A. calcareus, and A. setaceus) were found in Lai Chau Province, North Vietnam. These species distribute in both evergreen old-growth and secondary broadleaved forests, and mixed broadleaf-bamboo forest on the elevations of 996–2,134 m. They grow in forests with a high canopy cover of 67 m2 canopy area/ 100 m2 land and high cover ( 〉 90% land) of low vegetation ( 〈 2 m tall). It is believed that using the whole plant of Anoectochilus can treat hypertension and diabetes mellitus and improve the development of underdeveloped children. The folk uses include soaking in alcohol and boiled water for daily drinks like green tea, and consuming as a vegetable. The best harvesting season is during Autumn–Winter and fresh product is mainly marketed with the price of up to 100 U$D/1 kg fresh mass. Conclusion: A. lanceolatus, A. calcareus and A. setaceus are potential forest herbs for poverty reduction to ethnic communities in North Vietnam. The natural populations have been reduced remarkably because of overharvesting. Growing techniques are an urgent need for the conservation and sustainable development of such valuable orchids.
    Type of Medium: Online Resource
    ISSN: 2456-9119
    URL: Article
    DOI: 10.9734/jpri/2020/v32i1130551
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2020
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  • 4
    Online Resource
    Online Resource
    A Method to Select Plus Tree for Flower Purpose in Forestry
    Sciencedomain International ; 2019
    In:  Asian Journal of Research in Crop Science ( 2019-06-21), p. 1-8
    Details
    In: Asian Journal of Research in Crop Science, Sciencedomain International, ( 2019-06-21), p. 1-8
    Abstract: Plus tree selection is the first step to improve production and quality in forestry. An individual-based method is widely used to select plus trees for timber production, timber form, freedom from diseases and insects. In this study, a method to select plus trees for flower production is described and named as a crown-area-based method. Both individual-based and crown-area-based methods were used to select plus trees for Camellia impressinervis, a golden camellia; its yellow flowers have been used to treat sore throat and diarrhea, and to prevent cancers in China and Vietnam. Flower production of 21 concerned individuals was compared to the population mean and it was generated as a percentage. The population mean of the individual-based method is the mean of production of 21 trees as mean production/tree. While population mean of the crown-area-based method is mean production/m2 crown area (first production/m2 crown area for each tree was generated, then mean for population). The results indicated that both methods show seven individual trees with flower production 〉 100% population mean. However, individual trees are different. Only five of 7 trees are the same in both methods. The tree rankings by flower production percentage in both methods are totally different. The highest ranking by individual-based method (310% mean) is 4th ranking by crown-area-based method (181% mean). While the highest ranking by crown-area-based method (270% mean) is third ranking by individual-based method (260% mean). It is concluded that crown-area-based method is better in selecting plus trees for flower purpose, as it considers the crown area which is known as a productive part of a tree to form flowers.
    Type of Medium: Online Resource
    ISSN: 2581-7167
    URL: Article
    DOI: 10.9734/ajrcs/2019/v4i130063
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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