TAILIEUCHUNG - Báo cáo khoa học: "An assessment of edge effect on growth and timber external quality of ayous (Triplochiton scleroxylon K Schum) under Cameroon rain forest conditions"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "An assessment of edge effect on growth and timber external quality of ayous (Triplochiton scleroxylon K Schum) under Cameroon rain forest conditions. | Ann Sci For 1995 52 81-88 Elsevier INRA 81 Original article An assessment of edge effect on growth and timber external quality of ayous Triplochiton scleroxylon K Schum under Cameroon rain forest conditions TB Mayaka 1 JN Fonweban 2 z Tchanou 2 p Lontchui 3 Department of Basic Science 2 Department of Forestry University of Dschang PO Box 222 Dschang 3 Ministry of Forests and Environment Cameroon Received 28 August 1993 accepted 19 February 1994 Summary An investigation was conducted in order to assess the edge effect on growth characteristics and timber external quality of ayous Triplochiton scleroxylon K Schum . Average bole height and diameter at breast height Dbh were compared for trees growing on the edge and inside the plantation. Only the average Dbh differed significantly between trees of the 2 positions. The external quality of timber was found to decline from bottom to top of the tree irrespective of the position. This decline was more pronounced in the upper part of the interior trees as compared to the border trees. Finally a segmented polynomial function comprising a sloping line and a plateau fitted fairly well the decrease in Dbh measured at regular 5 m intervals from the border. The border effect thus appeared to be considerable though limited to within 10 m of the edge where a 50 decrease in Dbh occurred. This suggests that a guard area of at least 10 m wide should be allowed when sampling an old stand of ayous. Triplochyton scleroxylon edge effect bole section I inventory selection segmented polynomial function Resume Evaluation de I effet de bordure sur la croissance et la qualité externe du bois de I ayous Triplochyton scleroxylon K Schum dans les conditions de la foret dense humide camerounaise. Une étude a été conduite dans la reserve forestiere de Makak Cameroon dans le but d evaluer I effet de bordure sur la croissance et la qualité externe du bois de I ayous Triplochiton scleroxylon K Schum . À cet effet on a compare les hauteurs-futs et les

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