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  • 1
    Online Resource
    Online Resource
    Structural Characteristics of Natural Limestone Forests in Cat Ba Biosphere Reserves, Vietnam
    Sciencedomain International ; 2020
    In:  Annual Research & Review in Biology ( 2020-12-31), p. 161-172
    Details
    In: Annual Research & Review in Biology, Sciencedomain International, ( 2020-12-31), p. 161-172
    Abstract: An ecological understanding of natural forests after anthropogenic intervention is important for sustainable forest management. This study analyzed the overstory characteristics (species composition, growth, and diameter distribution) and regeneration (species richness, density, and height distribution) in natural limestone forests in Cat Ba Biosphere Reserve, Vietnam. Data were collected in nine study plots established in selective-logged (SLF), clear-cut (CCF), and unlogged (UF) forests. Results indicated that the overstory characteristics of SLF and CCF were lower than that of UF (species richness was 33 in UF, 20 in SLF, and 16 in CCF; DBH was 20.6 ±13.7 cm in UF, 16.9 ±9.7 cm in SLF, and 10.5 ±3.8 cm in CCF; Basal area was 38.2 m2 ha-1 in UF, 24.0 m2 ha-1 in SLF, and 11.4 m2 ha-1 in CCF). For regeneration, species richness also varied from UF (25) to SLF (13) and CCF (5), while seedling density reversely increased. We concluded that a 20-year restoration was insufficient for artificially disturbed forests to recover their ecological functions, regardless of logging intensities and techniques applied.
    Type of Medium: Online Resource
    ISSN: 2347-565X
    URL: Article
    DOI: 10.9734/arrb/2020/v35i1230321
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2020
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    Online Resource
  • 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
    Location Call Number Limitation Availability
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    Online Resource
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