tailieunhanh - Báo cáo khoa học: "An experimental system for the quantitative C-labelling 14 of whole trees in situ"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "An experimental system for the quantitative C-labelling 14 of whole trees in situ. | Ann Sci For 1993 50 309-318 Elsevier INRA 309 Technical note An experimental system for the quantitative 14C-labelling of whole trees in situ A Kajji A Lacointe FA Daudet p Archer JS Frossard INRA Université Blaise-Pascal Unité Associée de Physiologie Intégrée de I Arbre Fruitier Domaine de Crouelle F-63039 Clermont-Ferrand Cedex 02 France Received 8 April 1992 accepted 10 March 1993 Summary The first part of this paper provides a brief review of the requirements that apply to 14C-labelling chamber technology particularly for tree labelling and of the means that can be used to meet them. Two main points are considered the quality of the plant chamber environment - the necessity of thermal and hygrometric regulations is discussed - and the possibility of determining the exact amount of 14CO2 assimilated by the plant. The authors then describe a simple system allowing the quantitative labelling of entire trees without temperature- or hygrometry-regulating devices which can be used in the morning. The co2 concentration is maintained at its natural level throughout the labelling procedure through an injection of cold co2 operated by an IRGA-driven computer. This system was successfully used for the labelling of grafted walnut trees. assimilation chamber control of co2 level photosynthesis Résumé Un système experimental permettant le marquage quantitatif au 14c d arbres entiers in situ. Ce système utilise pour le marquage de noyers greỉíés de 3 ans surface foliaire 1 7 m2 se compose d une chambre d assimilation et d un dispositif d injection de co2 à commande électronique permettant une régulation continue de la concentration en co2 fig 1 . Ne comportant pas de dispositif de régulation thermique II n est utilise que pendant la matinée. Malgré une augmentation significative de la temperature au cours du marquage fig 2 la photosynthèse est peu perturbée comme le montre la figure 3 le taux d assimilation pente des segments décroissants reste régulier. La chambre d .

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