tailieunhanh - Báo cáo lâm nghiệp: "The effects of thinning treatments on density, MOE, MOR and maximum crushing strength of Pinus brutia Ten. wood"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: The effects of thinning treatments on density, MOE, MOR and maximum crushing strength of Pinus brutia Ten. wood. | Ann. For. Sci. 64 2007 467-475 INRA EDP Sciences 2007 DOI forest 2007024 Available online at Original article The effects of thinning treatments on density MOE MOR and maximum crushing strength of Pinus brutia Ten. wood Bilgin Guller Suleyman Demirel Universitesi Orman Fakultesi Isparta Turkiye Received 9 November 2005 accepted 30 May 2006 Abstract - The purpose of this study was to determine the effects of plantation thinning on various wood properties of Pinus brutia Ten. Tree samples were obtained from heavily and moderately thinned and unthinned 33-35 year-old plantations. Wood properties were examined in various wood zones including 16 annual rings after the first treatment. The results of this study showed that there was a significant relationship between thinning intensity and radial increment m for an individual tree. Thinning treatments increased annual ring width especially a few years after thinning. Heavy thinning treatments were especially effective in impacting mean ring width values at breast height. However the percentage of late wood did not differ much between the samples. Based on the results of correlation analysis between ring width and late wood percentage there was no significant correlation identified. Mean wood density was not affected by the treatments. Also no significant correlation was found between thinning and examined strength properties MOR MOE and compression strength parallel to grain . However a relationship was found between wood density and all strength properties except for MOE. The current results suggest that thinning can produce improvements in ring width without any negative impacts on investigated wood properties. It is recommended that subsequent studies should be designed to understand genetic effects and maximize treatment effects. Pinus brutia Ten. thinning wood properties Résumé - Effets de l intensité des éclaircies sur la densité les modules d élasticité et de rupture et de rupture

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