Population dynamics and regeneration of Shorea roxburghii, a threatened timber species in Southern region, Viet Nam

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TRAN QUANG BAO
LE HONG VIET
NGUYEN HONG HAI
NGUYEN THANH TUAN
LE VAN CUONG

Abstract

Abstract. Bao TQ, Viet LH, Hai NH, Tuan NT, Cuong LV. 2021. Population dynamics and regeneration of Shorea roxburghii, a threatened timber species in Southern region, Viet Nam. Biodiversitas 22: 5649-5656. Despite its wide distribution in South and Southeast Asia, Shorea roxburghii G. Don is classified as Vulnerable in the IUCN Red List of Threatened Species due to over-exploitation for its valuable timber. This study aims to investigate the population dynamics and regeneration of S. roxburghii in southeastern Vietnam, serving for conservation and sustainable development plan. Six plots of 2,500 m2 each (50 m × 50 m) were established at two forest conditions: i) forest with standing volume > 200 m3/ha (SV>200), and ii) < 200 m3/ha (SV<200); to investigate stems with diameter at breast height (DBH) ? 5 cm and that < 5 cm. Moisture (%), pHH2O of the topsoil and the occurrence of regenerating S. roxburghii were collected from 125 points in the study site. The results indicated that mean stem height, DBH, basal area, and aboveground biomass were significantly higher at the forest stand with SV>200 than that at the forest stand with SV<200 for the pool of all species. Similar higher figures were found in SV>200 for the pool of S. roxburghii compared to that in SV<200, except mean DBH, which was larger in SV<200. There were missing stems with DBH < 5 cm in SV<200, while it was numerous in SV>200 (1,313 stems/ha). DBH/stem distributions in both forest types had an inverted-J shape with a peak at 10-15 cm DBH for the pool of all species, while there was no clear pattern for the pool of S. roxburghii in both forest types. Regression analysis indicated that higher total crown area of stems ? 23 tall leads to higher S. roxburghii stems, while the higher total crown area of stems < 23 tall leads to fewer S. roxburghii stems with DBH < 5 cm. It is concluded that the total crown area of forest stand plays an important role in the sustainable regeneration of S. roxburghii. Silvicultural treatment should be applied to reduce stand density and crown area of stems < 23 m tall to enhance sunlight reaching the forest floor for germination, growth, and survival of S. roxburghii. The moisture of the topsoil ranging from 60 - 80% and the pHH2O ranging from 3.8 - 4.6 are suitable conditions for natural regeneration of S. roxburghii.

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References
Ådjers, G., S. Hadengganan, J. Kuusipalo, K. Nuryanto and L. Vesa (1995). "Enrichment planting of dipterocarps in logged-over secondary forests: effect of width, direction and maintenance method of planting line on selected Shorea species." Forest Ecology and Management 73(1-3): 259-270.
Anonymous (1985). "Dipterocarps of South Asia." RAPA Monograph 4/85, FAO Regional Office for the Asia and the Pacific.
Ashton, P. (1982). "Dipterocarpaceae. Flora Malesiana, Series 1." 9: 251-552.
Chauhan, K. (1998). Framework for conservation and sustainable use of biological diversity: Action plan for the Eastern Ghats region. Proceedings of Seminar on Conservation of Eastern Ghats.
Chave, J., C. Andalo, S. Brown, M. A. Cairns, J. Q. Chambers, D. Eamus, H. Fölster, F. Fromard, N. Higuchi and T. Kira (2005). "Tree allometry and improved estimation of carbon stocks and balance in tropical forests." Oecologia 145(1): 87-99.
Hinh, V. T. (2012). Method to construct of standing volumes table for natural forest of Vietnam, Agriculture Publishing House, Hanoi, Hanoi.
Huy, B., K. Kralicek, K. P. Poudel, V. T. Phuong, P. Van Khoa, N. D. Hung and H. Temesgen (2016). "Allometric equations for estimating tree aboveground biomass in evergreen broadleaf forests of Viet Nam." Forest Ecology and Management 382: 193-205.
Khuc, V. Q., B. Q. Tran, P. Meyfroidt and M. W. Paschke (2018). "Drivers of deforestation and forest degradation in Vietnam: An exploratory analysis at the national level." Forest policy economics 90: 128-141.
Le, H. V., H. H. Nguyen, Q. B. Tran, V. T. Nguyen and N. H. Le (2020). "The spatial structural characteristics of dominant species in tropical moist evergreen closed forest at Tan Phu zone, Dong Nai Province." Journal of Forest Science and Technology 01: 72-82.
Manokaran, N. and J. LaFrankie Jr (1990). "Stand structure of Pasoh Forest Reserve, a lowland rain forest in Peninsular Malaysia." Journal of Tropical Forest Science: 14-24.
Maury-Lechon, G. and L. Curtet (1998). "Biogeography and evolutionary systematics of Dipterocarpaceae, In: Appanah S, Turnbull JM (Eds.). A Review of Dipterocarps: Taxonomy, Ecology and Silviculture." Center for International Forestry Research, Indonesia: 5-44.
Morikawa, T., S. Chaipech, H. Matsuda, M. Hamao, Y. Umeda, H. Sato, H. Tamura, K. Ninomiya, M. Yoshikawa and Y. Pongpiriyadacha (2012). "Anti-hyperlipidemic constituents from the bark of Shorea roxburghii." Journal of natural medicines 66(3): 516-524.
Moriyama, H., M. Moriyama, K. Ninomiya, T. Morikawa and T. Hayakawa (2016). "Inhibitory effects of oligostilbenoids from the bark of Shorea roxburghii on malignant melanoma cell growth: Implications for novel topical anticancer candidates." Biological Pharmaceutical Bulletin 39(10): 1675-1682.
Nguyen, H. H., T. T. Nguyen, Q. B. Tran, A. M. Petritan, H. M. Trinh, T. T. H. Cao, T. H. Vu and I. C. Petritan (2020). "Changes in Community Composition of Tropical Evergreen Forests during Succession in Ta Dung National Park, Central Highlands of Vietnam." Forests 11(12): 1358.
Nguyen, V. H., H. V. Le, Q. B. Tran and T. L. Nguyen (2020). "Wood plant diversity and Aboveground carbon stocks of (Shorea roxburghii G. Don) dominant forests in Tan Phu, Dong Nai Province." Journal of Forest Science and Technology 10: 66-76.
Ninomiya, K., S. Chaipech, Y. Kunikata, R. Yagi, Y. Pongpiriyadacha, O. Muraoka and T. Morikawa (2017). "Quantitative determination of stilbenoids and dihydroisocoumarins in Shorea roxburghii and evaluation of their hepatoprotective activity." International journal of molecular sciences 18(2): 451.
Paillet, Y., L. Bergès, J. Hjältén, P. Ódor, C. Avon, M. Bernhardt?Römermann, R. J. BIJLSMA, L. De Bruyn, M. Fuhr and U. Grandin (2010). "Biodiversity differences between managed and unmanaged forests: Meta?analysis of species richness in Europe." Conservation biology 24(1): 101-112.
Pooma, R., M. Newman and M. Barstow (2014). Shorea roxburghii. The IUCN red list of threatened species 2017, Downloaded on 17 July 2020.
Raju, A., K. V. Ramana and P. H. Chandra (2011). "Reproductive ecology of Shorea roxburghii G. Don (Dipterocarpaceae), an Endangered semievergreen species tree of peninsular India." Journal of Threatened Taxa: 2061-2070.
Reddy, C. S., K. Reddy and S. Jadhav (2001). "Threatened (medicinal) plants of Andhra Pradesh." Medicinal Plants Conservation Center: 1-39.
Swaine, M. D. and T. Whitmore (1988). "On the definition of ecological species groups in tropical rain forests." Vegetatio 75(1): 81-86.
Tran, Q. B. and H. V. Le (2019). "Ecological role of Shorea roxburghii population in tree species composition of tropical moist evergreen closed forest in Tan Phu Zone of Dong Nai Province." Journal of Forest Science and Technology 5: 90-98.
Tran, Q. B. and H. V. Le (2019). "The effect of ecological factors to natural regeneration of Shorea roxburghii g. don in tropical moist evergreen closed forest at Tan Phu zone of Dong Nai Province." Journal of Forest Sciences 3: 77-88.
Tran, V. D., N. Cam, T. Sato, N. Binh, O. Kozan, N. Thang and R. Mitlöhner (2016). "Post-logging regeneration and growth of commercially valuable tree species in evergreen broadleaf forest, Vietnam." Journal of Tropical Forest Science: 426-435.
Tran, V. D., O. Kozan, M. Yamamoto, V. Dai Hai, P. D. Trung, N. T. Thang, H. Van Thang, T. D. Manh, V. T. Lam and N. H. Thinh (2018). "A natural forest of commercial timber species: logging or not logging." Small-scale Forestry 17(4): 555-568.
Tran, V. D., D. K. Lee and T. H. Van (2005). "Rehabilitation of the native tree species in the forest plantations and denuded hills of Namlau commune in Sonla province, Vietnam." Forest Science Technology 1(1): 51-58.
Tran, V. D., A. Osawa and N. T. Thang (2010). "Recovery process of a mountain forest after shifting cultivation in Northwestern Vietnam." Forest Ecology and Management 259(8): 1650-1659.
Tran, V. D., A. Osawa, N. T. Thang, N. B. Van, B. T. Hang, C. Q. Khanh and D. X. Tuan (2011). "Population changes of early successional forest species after shifting cultivation in Northwestern Vietnam." New Forests 41(2): 247-262.
Tripathi, R. and M. Khan (2007). "Regeneration dynamics of natural forests–A review." Proceedings of the Indian National Science Academy 73: 167-195.

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