tailieunhanh - Báo cáo lâm nghiệp: "2 CO assimilation M. Pinto in young Prosopis plants"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: 2 CO assimilation M. Pinto in young Prosopis plants. | 433s Ann. Sci. For. 1989 46 suppl. 433S-438S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA co2 assimilation in young Prosopis plants M. Pinto Departamento de Producción Agricola Facultad de Ciencas Agrarias y Forestales Universitad de Chile Casilla 1004 Santiago Chile Introduction Prosopis trees Leguminoseae are widely distributed in the dry regions of North and South America. Their biomass and fruit production which can be very large Pinto and Riveros 1989 and their N2-fixing ability Felker and Clark 1980 are important characteristics to be considered within forestation programs. At present water economy of most important Prosopis species is well known Mooney et al. 1982 Acevedo et al. 1985a Aravena and Acevedo 1985 but data on the co2 assimilation by any single species of Prosopis are lacking. According to Acevedo et al. 1985b Prosopis tamarugo is a C3 plant and the net assimilation rates of other Prosopis species could be similar to that of some mediterranean fruit trees Wilson et al. 1974 Hanson 1982 Mooney et al. 1982 . In old Prosopis trees this assimilation could display large variations Wilson et al. 1974 and in some cases assimilation rates could be too low to support fruit growth. This has been suggested as one reason for the observed occasional premature fall of fruits Salvo 1986 . Proso-pis shows important variations in net co2 assimilation during the season Mooney et al. 1982 . Due to the genetic variation of these trees Hunziker et al. 1975 it is possible to find differences between individuals. The objective of this work was to determine net co2 assimilation rates under different light intensities and co2 levels in provenances of Chilean Algarro-bo Prosopis chilensis which exhibited different rates of growth and to compare them with those of p. tamarugo and p. juliflora at different temperatures. Materials and Methods co2 assimilation rates A were measured on p. chilensis under different light intensities with 350 ppm co2 in ambient air

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