tailieunhanh - Báo cáo khoa học: "yield of maritime pine (Pinus pinaster Ait): the average dominant tree of the stand"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"yield of maritime pine (Pinus pinaster Ait): the average dominant tree of the stand. | 593 Ann Sci For 1991 48 593-611 Elsevier INRA Original article Growth and yield of maritime pine Pinus pinaster Ait the average dominant tree of the stand B Lemoine Station de Recherches Forestieres Institut National de la Recherche Agronomique Domaine de L Hermitage BP 45 33611 Gazinet Cedex France Received 31 August 1990 accepted 24 June 1991 Summary A stand growth model was developed using 2 attributes height and basal area of the average dominant tree. The model is based on temporary plots corresponding to different silvicultural treatments thinning and fertilization experiments. - Regarding the first attribute dominant height growth a model using 2 uncorrelated parameters was developed. It was derived from a previous principal component analysis based on data issued from stem analysis. The first parameter is an index of general vigor which is well correlated with the dominant height h0 40 at the reference age of 40 years. The second parameter refers to variations in the shape of the curve particularly for initial growth. The growth curves of the various temporary plots could be accurately described with this model. Phosphorus fertilization at the time the stand was established improved both dominant height h0 40 and initial growth. - Regarding the second attribute basal area growth the basal area increment was described using 4 independent variables height increment dominant height h0 40 age and competition This model includes the effect of stand density. It was validated considering the error term and its first derivative according to age. The model may therefore be used as a growth function. Nevertheless residual variance was rather high and could be subdivided into a random component 75 ot the residual variance and a slight autocorrelation term ie a correlation between successive deviations due to unknown factors. The relationship between basal area growth and age was assumed to be the result of both increased leaf biomass and dry matter partitioning. The .

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