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Nitrogen Mineralization Pattern of an Oxisol of Guadeloupe, French West Indies

^a Unité Agropédoclimatique, INRA Antilles-Guyane, Domaine Duclos, Prise d'Eau, 97170 Petit Bourg, Guadeloupe (FWI), France
^b LAQUIGE, CONICET, Velasco 847, 1414 Buenos Aires, Argentina

View larger version (35K): [in a new window]   Fig. 1 Kinetics of N mineralization and nitrification for the neutral soil Oxisol incubated at different temperature and water potential. Only N mineralization is presented for 50°C and 1500 kPa because no nitrification was observed in these treatments. Vertical bars indicate standard error. See text for the coefficient of determination of each fit

View larger version (17K): [in a new window]   Fig. 2 Temperature response of the constant rates of N mineralization (k1 and k2) and nitrification (knit) for the NS Oxisol. The observed data were fitted with the Q10 equation. Vertical bars indicate estimation error. See text for the coefficient of determination of each fit

View larger version (18K): [in a new window]   Fig. 3 Comparison between the temperature response of the constant rate of N mineralization k1 estimated in the present study for the NS Oxisol (30 kPa) and in two temperate soils. Data from the literature were obtained at 30 kPa. Data of Cabrera and Kissel (1988b) were calculated from their constant rate k1 estimated with the double-exponential model and the Q10 value assumed by these authors based on the results of Stanford et al. (1973)

View larger version (30K): [in a new window]   Fig. 4 Microbial biomass C measured at the beginning and at the end of the Exp. 1 for the neutral soil (NS) and the acid soil (AS) Oxisols

View larger version (16K): [in a new window]   Fig. 5 Relationship between the constant rate k1 estimated for the neutral soil (NS) Oxisol and the microbial biomass C at the end of Exp. 1