TAILIEUCHUNG - Báo cáo lâm nghiệp: "Environmental control of CO assimilation rate and leaf 2 conductance in two species of the tropical rain forest of French Guiana (Jacaranda copaia D. Don and Eperua falcata Aubl.)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Environmental control of CO assimilation rate and leaf 2 conductance in two species of the tropical rain forest of French Guiana (Jacaranda copaia D. Don and Eperua falcata Aubl.). | 443s Ann. Sci. For. 1989 46 suppl. 443s-447s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Environmental control of co2 assimilation rate and leaf conductance in two species of the tropical rain forest of French Guiana Jacaranda copaia D. Don and Eperua falcata Aubl. R. Hue1 and . Guehl2 1 station de Recherches Forestieres INRA BP 709 97387 Kourou Cedex and 2Laboratoire de Bioclimatologie-Ecophysiologie station de Sylviculture et Production INRA Centre de Nancy Champenoux 54280 Seichamps France Introduction The potential environmental limitations to forest tree production under subequatorial climatic conditions are not well understood. Despite important annual precipitation drought in the atmosphere and in the soil is likely to play a limiting role because 1 significant climatic water deficits occur during the dry seasons and 2 the rain forest species do not seem to have evolved efficient adaptative features against drought Doley et al. 1987 . The present study was aimed at comparing the co2 assimilation and stomatai conductance behavior under natural conditions during the dry season in artifical 3 yr old stands of J. copaia a long living pioneer species occurring in open sites and of E. falcata a common species of the mature forest canopy. Materials and Methods The study was performed at an experimental site of the Centre Technique Forestier Tropical in French Guiana 53 w N with 2200 mm average annual rainfall. Total rainfall over the experimental period 1 September-15 October 1987 amounted to mm extreme air temperatures were 20 night and 34 c day and average potential evapotranspiration was mm-d-1. The mean height of the studied trees was m J. copaia and m E. falcata . In situ co2 assimilation rate A and leaf conductance g were determined by means of a portable gas-exchange measurement system Li-Cor 6200 Li-COR Lincoln NE . . Prior to the measurements reported here the within-tree variability of gas exchange was assessed

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