tailieunhanh - Báo cáo lâm nghiệp:" Variation in the decay resistance and its relationship with other wood characteristics in old Scots pines"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Variation in the decay resistance and its relationship with other wood characteristics in old Scots pines" | Ann. For. Sci. 60 2003 409-417 INRA EDP Sciences 2003 DOI forest 2003033 409 Original article Variation in the decay resistance and its relationship with other wood characteristics in old Scots pines Martti VENĂLĂiNENa Anni M. HARJUa Pirjo KAiNULAiNENb Hannu Viitanenc Hanna NiKULAiNENb a Punkaharju Research Station Finnish Forest Research Institute 58450 Punkaharju Finland b Department of Ecology and Environmental Science University of Kuopio PO Box 1627 70211 Kuopio Finland c VTT Building and Transport PO Box 1806 02044 VTT Finland Received 23 May 2002 accepted 30 September 2002 Abstract - The importance of factors contributing to the natural decay resistance of Scots pine wood was studied. The decay rate of sapwood and outer and inner heartwood of 16 ca. 170-year-old Scots pines was first measured. A six-week decay test was performed with 5 X 15 X 30 mm wood blocks in dishes containing a brown-rot fungus Coniophora puteana . The average mass loss in sapwood was 141 mg cm1 3 in outer heartwood 57 and in inner heartwood 108. The variation between trees was largest in outer heartwood. The corresponding basic densities were 439 456 and 411 mg cm3. The mass loss was then compared with chemical characteristics and the sorption of water by parallel sample blocks in order to determine which factor has the greatest effect on decay resistance. The differences in heartwood mass loss were explained best by the concentration of pinosylvin and its monomethyl ether which are phenolics belonging to the group of stilbenes as well as by the concentration of total phenolics determined by the Folin-Ciocalteu method. decay resistance heartwood phenolic compound pinosylvin resin acid moisture content Résumé - Variation de la résistance à la pourriture et relation avec les autres caractéristiques du bois dans les vieux pins sylvestres. L etude a porté sur l importance relative des facteurs à l origine de la resistance naturelle à la pourriture du pin sylvestre Pinus sylvestris