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  • 1
    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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  • 2
    Online Resource
    Online Resource
    Aboveground Net Primary Production at Acacia mangium Plantation in Northern Vietnam
    Sciencedomain International ; 2019
    In:  Asian Journal of Research in Agriculture and Forestry ( 2019-05-17), p. 1-7
    Details
    In: Asian Journal of Research in Agriculture and Forestry, Sciencedomain International, ( 2019-05-17), p. 1-7
    Abstract: Net primary production (NPP) is an important index for understanding carbon cycling in forest ecosystems. In this study, aboveground NPP at Acacia mangium plantation was estimated basing on allometry for aboveground biomass increment (ΔM) and litter trap technique for litterfall (Lf). The experiment was conducted in two plots of 300 m2 each (15 × 20 m), established at a 21-month old plantation. Data were collected five times of 3-month intervals in a total duration of 357 days. The results indicated that Lf and ΔM were seasonal-dependent. Litterfall was highest (4.06 g m-1 day-1) during Sep-Jan (late rainy season, early winter) and lowest (1.10 g m-1 day-1) during Mar-Jun (early rainy season, early summer). While, ΔM was highest (13.51 g m-1 day-1) during Jun-Sep (rainy season, summer) and lowest (3.10 g m-1 day-1) during Jan-Mar (dry season, winter). Total Lf in a duration of 357 days was 9.69 tons ha-1 and ΔM was 27.71 tons ha-1, leading to total aboveground NPP of the present study plantation of 37.40 tons ha-1. It is concluded that aboveground NPP of acacia plantation was much higher than other forests of different types and ages around the world. Such difference indicates the importance of acacia plantation in soil nutrient cycling through litterfall decomposition and carbon sequestration through aboveground biomass increment.
    Type of Medium: Online Resource
    ISSN: 2581-7418
    URL: Article
    DOI: 10.9734/ajraf/2019/v3i330038
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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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$D/1 kg fresh mass. Conclusion: A. lanceolatus, A. calcareus and A. setaceus are potential forest herbs for poverty reduction to ethnic communities in North Vietnam. The natural populations have been reduced remarkably because of overharvesting. Growing techniques are an urgent need for the conservation and sustainable development of such valuable orchids.
    Type of Medium: Online Resource
    ISSN: 2456-9119
    URL: Article
    DOI: 10.9734/jpri/2020/v32i1130551
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2020
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  • 4
    Online Resource
    Online Resource
    Possible Planting Areas for Golden Camellia - Camellia impressinervis in Vietnam
    Sciencedomain International ; 2019
    In:  Asian Journal of Agricultural and Horticultural Research ( 2019-03-18), p. 1-7
    Details
    In: Asian Journal of Agricultural and Horticultural Research, Sciencedomain International, ( 2019-03-18), p. 1-7
    Abstract: Camellia impressinervis is known as a golden camellia, naturally distributing in China and Vietnam. Leaves and flowers of golden camellias contain active ingredients such as polysaccharides, polyphenols, saponins, and flavonoids. It was found to be able to inhibit the transplanted cancer, lower blood lipid, lower cholesterol, and prevent atherosclerosis. Market price of dry flowers of golden camellias in Vietnam is high, up to 700 US$/kg. This work was to identify suitable planting areas for C. impressinervis in Vietnam. Natural conditions, where C. impressinervis naturally distributes, were used for mapping, including elevation above sea level, annual precipitation, and annual air temperature. Each condition was classified to four levels as “very suitable”, “suitable”, “less suitable”, and “not suitable” for planting. Three corresponding digital maps were used for mapping. The results indicated that 72,781 ha accounting for 32.3% total land area of the study site was classified as “very suitable” for planting C. impressinervis. The “suitable” areas accounted for 34.2% and the not suitable areas accounted for 33.5% total land area. There was no area belonging to “less suitable”. It is recommended that C. impressinervis should be planted in “very suitable” areas and may be extended some to “suitable” areas. However, it should be widely planted only after carefully studying on cultivar selection, seedling production, and planting and tending techniques with consultation by local authorities.
    Type of Medium: Online Resource
    ISSN: 2581-4478
    URL: Article
    DOI: 10.9734/ajahr/2019/v3i330000
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    Soil Texture, Organic Matter and Nutrients Affect Production of Acacia in Northeast Vietnam
    Sciencedomain International ; 2020
    In:  Asian Journal of Advanced Research and Reports ( 2020-07-25), p. 33-41
    Details
    In: Asian Journal of Advanced Research and Reports, Sciencedomain International, ( 2020-07-25), p. 33-41
    Abstract: Soil provides nutrients, water, and growing space for plants, and thus is the basis for life on earth. Soil nutrient availability impacts productivity of terrestrial ecosystems i.e. forest. However, support for this phenomenon in the tropics remains elusive. In this study, the effects of soil properties including texture, organic matter and nutrients on production of Acacia hybrid and A. mangium plantations in Northeast Vietnam were studied. Thirtythree sample plots of 500 m2 (20 m × 25 m) each were established in plantations of 1–14 years old for measuring stem diameter at breast height and height for all Acacia trees. In each plot, a 0–30 cm depth soil sample was taken for analyzing soil texture, organic matter, and nutrients. While allometry was used to estimate standing volume (production) of all measured stems. The results indicated that both species had rapid growth until 8th year after planting, then growth speed decreases as age increasing. The ratio of loam particles in soil controls production of both species, as higher loam ratios lead to lower production in terms of the standing volume. While higher phosphorous availability in the soil will lead to higher production of A. mangium but not A. hybrid. There weren’t any relationships between production and soil nitrogen and potassium for both species. It is concluded that A. hybrid and A. mangium should be logged at the age earlier than 8 years old for pulpwood to maximize production, rapid reinvestment, and benefit return. Fertilizing phosphorus to acacia plantations should be conducted to increase production, while potassium and nitrogen should not be applied.
    Type of Medium: Online Resource
    ISSN: 2582-3248
    URL: Article
    DOI: 10.9734/ajarr/2020/v12i230285
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2020
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  • 6
    Online Resource
    Online Resource
    Golden Camellias: A Review
    Sciencedomain International ; 2019
    In:  Archives of Current Research International ( 2019-02-20), p. 1-8
    Details
    In: Archives of Current Research International, Sciencedomain International, ( 2019-02-20), p. 1-8
    Abstract: Golden camellias or yellow camellias are species belonging to genus Camellia L., family Theaceae. Fifty two species were described in southern China and Vietnam. Active ingredients such as polysaccharides, polyphenols, saponins, and flavonoids are well known characteristics of golden camellias. Its leaves and flowers have been long traditionally used for health improvement. It was found to be able to inhibit transplanted cancer, lower blood pressure, lower blood lipid, lower cholesterol, and prevent atherosclerosis. Currently, it costs 320–700US$ per one kg of dry flowers. Such price attracts many local ethnic people to plant golden camellias for poverty reduction. This work reviews (1) species and natural distribution, (2) uses and healthcare values, (3) techniques for seedling production, planting and tending, and (4) opportunities and challenges for future development of golden camellias.
    Type of Medium: Online Resource
    ISSN: 2454-7077
    URL: Article
    DOI: 10.9734/acri/2019/v16i230085
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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  • 7
    Online Resource
    Online Resource
    Persian Walnut in Vietnam: A Potential Fruit Tree for Poverty Reduction
    Sciencedomain International ; 2019
    In:  Asian Journal of Advanced Research and Reports ( 2019-06-26), p. 1-8
    Details
    In: Asian Journal of Advanced Research and Reports, Sciencedomain International, ( 2019-06-26), p. 1-8
    Abstract: Persian walnut, Juglans regia L., is a long-lived, wind-pollinated and deciduous tree, which produces large, woody, shelled and edible nuts. J. regia is one of the most economically important cultivated species for timber and nutritious nuts. Its nuts have medicinal importance for human health by high antioxidant capacity. J. regia has been planted in Northern Vietnam for decades. In this study, a survey was conducted in three provinces to understand current planting sites and production of planted trees. The results indicated that J. regia was planted personally in gardens of local people in Lai Chau, Lao Cai and Ha Giang provinces, sharing borderlines with China. The planted trees are 10-30 years old with some exceptions of up to 40-50 years old. Generally, each household owns 2-3 fruited trees with some exceptions of up to 10 trees. After planting 7 years, trees fruit annually. However, the production varies among trees. A best 20-25-year-old tree can yield 55 kg fruits/year with current market price of 1.5 US$/ 1 kg fruits. There exists high variation of fruit production among planted sites, as results of climate difference, and unknown source and sexual propagation seedlings. It is concluded that to establish an extensive plantation of J. regia for high fruit production, selecting superior genotypes from local populations should be conducted, then vegetative propagation such as grafting should be applied to produce good and uniform seedlings.
    Type of Medium: Online Resource
    ISSN: 2582-3248
    URL: Article
    DOI: 10.9734/ajarr/2019/v5i130123
    Language: Unknown
    Publisher: Sciencedomain International
    Publication Date: 2019
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  • 8
    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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