Báo cáo lâm nghiệp: Field studies of leaf gas exchanges (Elaeis guineensis Jacq.)

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Field studies of leaf gas exchanges (Elaeis guineensis Jacq.)...
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Báo cáo lâm nghiệp: "Field studies of leaf gas exchanges (Elaeis guineensis Jacq.)" in oilField studies of leaf gas palm tree exchanges(Elaeis guineensis Jacq.)E. Dufrene B. Saugier Orsay Cedex, France d’Ecologie V6g6tale, Universit6 Paris-Sud, 91405Laboratoire In this study, we evaluated variations inIntroduction leaf photosynthesis in 8 trees of the same progeny, and the effect of vapor pressureThis study is part of a larger research pro- deficit (VPD e (T e and leaf tem- saa) -) =gram on climatic and biological factors perature ( T on stomatal conductance and ) taffecting oil palm yield. Our purpose was leaf gas exchanges.to characterize, under conditions of goodwater supply, variations in leaf photosyn-thesis with internal and external factors. Materials and Methods Several authors have been working on study site was located at the Thethe C0 assimilation rate (A) in oil palm. 2 LR.H.O. experimental station of La 2 C.LR.A.D. VMost of them have used young plants Me near Abidjan, Ivory Coast (5°26’N Lat.,under laboratory conditions to study 3°50’W Long.). The studied trees belong to oneeffects of photosynthetically active radia- single line (L2T used as a reference in D10D) * many trials of the production area and char-tion (Corley et al., 1973; Hirsch, 1975), acterized by a moderate vegetative develop-foliar temperature (Hong and Corley, ment associated with good bunch production.1976) or leaf water potential and stomatal The net C0 assimilation rate (A) was mea- 2conductance (Adjahossou, 1983). Only 2 sured using a leaf chamber (PLC, A.D.C.3) andexperiments were conducted in the field: a portable C0 analyzer (LCA2, A.D.C.) 2 connected in an open system. Leaf tempera-Bolle-Jones (1968) determined the ture, transpiration rate, boundary layer and sto-amount of soluble sugars in 9 yr old leaf- matal conductances were calculated using thelets and Corley (1983) observed the energy balance equation (Parkinson, 1985)effects of leaf senescence on photosyn- combined with standard equations (von Caem- merer and Farquhar, 1981thesis using the 14 method. 2 CO ).1RI.R.H.O.:L Institut de Recherche .H.O.: les Huiles et les 01, 6agineux. 0 [6agineux. sur2 C.I.R.A.D.: Centre de Cooperation International en Recherche Agronomique pour le D6veloppement.3 A.D.C.: Analytical Development Company.Results conductance increased with leaf tempera- ...