Effects of thinning on the growth of Acacia mangium Willd in Yen The district, Bac Giang province
Keywords:
Acacia mangium,, thinning, leaf area index (LAI), photosynthesisAbstract
Effects of thinning on the growth, canopy, leaf area index and photosynthesis of Acacia mangium Willd were carried out in Yen The district, Bac Giang province. The results showed that, after 5 years of experiment, the height of the tree was not significantly affected by thinning intensity, whereas the diameter at breast height (DBH) of trees in the treatments had significant differences, in which the
thinning treatment of 600 trees/ha had largest diameter (17.64cm), followed by the DBH of the tree in the treatment of 800 trees/ha (16.55cm) and 1080 trees/ha (15.27cm). The canopy of trees in the treatments was 78.94% (800 trees/ha), 78.21% for treatment of 1080 trees/ha and 77.55% (600 trees/ha) and no significant difference between the treatments. The leaf area index of the treatment of 600 trees/ha (1.26 m2m -2 ) was significantly different with both of
two treatments of 800 trees/ha (1.72 m2 m-2) and treatment of 1,080 trees/ha (1.71 m 2 m-2). The treatment of 600 tree/ha had highest photosynthesis with (6.64 -2s -1) and was significantly different from the treatment of 800 trees/ha (5.13-2s-1) and the treatment of 1080 trees/ha (5.18 -2s-1)
References
1. Beadle, CL, DT Trieu, CE Harwood, 2013. Journal of Tropical Forest Science, and Undefined 2013. Thinning Increases Saw-Log Values in Fast-Growing Plantations of Acacia Hybrid in Vietnam. Journal of Tropical Forest Science 25(1): 42 - 51 (2013).
2. B Nông nghip và Phát trin nông thôn. 2019. Thông tin t Hi ngh gi ng cây tr ng lâm nghip. Thái Nguyên, tháng 4/2019.
3. i phát tri n r ng tr ng g l n Vit Nam.
4. Cameron, 2001. Importance of early selective thinning in the development of long-term stand stability and improved log quality: a review. Forestry 75: 25 - 35
5. Correia, M. J., M. M. C. Chaves, and J. S. Pereira. 1990. Afternoon Depression In Photosynthesis in Grapevine Leaves-Evidence for a High Light Stress Effect. Journal of Experimental Botany 41 (4): 417 - 26. https://doi.org/10.1093/jxb/41.4.417.
6. Frazer, S, C.D. Canham, and K Lertzman. 1999. Gap Light Analyzer (GLA). Users Manual and Programme Documentation, Version 2.0. Simon Fraser University: Burnaby, British.
7. Kim Moonil, Woo-Kyun Lee, Yoo-Seoung Kim, Chul-Hee Lim, Cholho Song, Taejin Park, Yowhan Son & Yeong-Mo Son. 2016. Impact of thinning intensity on the diameter and height growth of Larix kaempferi stands
in central Korea. Forest Science and technology Volume 12, 2016 - Issue 2.
8. Medhurst, J. L., and C. L. Beadle. 2001. Crown Structure and Leaf Area Index Development in Thinned and Unthinned Eucalyptus Nitens Plantations. Tree Physiology 21 (12 - 13): 989 - 99. https://doi.org/10.1093/treephys/21.12 - 13.989.
9. Stenberg, P., S. Linder, H. Smolander, and J. Flower-Ellis. 1994. Performance of the LAI - 2000 Plant Canopy Analyzer in Estimating Leaf Area Index of Some Scots Pine Stands. Tree Physiology 14 (7 - 8 - 9): 981 - 95. https://doi.org/10.1093/treephys/14.7 - 8 - 9.981.
10. Tr c Bình, 2019. Nghiên c u các bin pháp k thu t tr ng r ng keo lai thâm canh cung c p g l n ti vùng Bc Trung B . Báo cáo t ng k tài khoa h c và phát tri n công ngh c . Vi n Khoa hc Lâm nghi p Vit Nam.
11. Tr ng, 2018. Chuyn hóa r ng cung cp g nh thành r ng g l n các loài keo lai và ng. Báo cáo tng kt D án th nghim. Vin Khoa h c Lâm nghi p Vit Nam.
12. Valladares, F., S. Arrieta, I. Aranda, D. Lorenzo, D. Sanchez-Gomez, D. Tena, F. Suarez, and J. A. Pardos. 2005. Shade Tolerance, Photoinhibition Sensitivity and Phenotypic Plasticity of Ilex Aquifolium in Continental Mediterranean Sites. Tree Physiology 25 (8): 1041 - 52. https://doi.org/10.1093/treephys/25.8.1041.
13. Vu Dinh Huong. 2016. Understanding growth and physiological responses to slash management, thinning and fertilizer application in short-rotation tropical acacia plantations. PhD thesis, University of Tasmania, Australia.
14. , Daniel S. Mendham, Dugald C. Close. 2016. Growth and physiological responses to intensity and timing of thinning in short rotation tropical Acacia hybrid plantations in South Vietnam. Forest Ecology and Management: 380, pp. 232 - 241.
