Montagnini, F. Buschbacher, R.
Nitrification rates in two undisturbed tropical rain forests and three slash-and-burn sites of the Venezuela Amazon - Ithaka, (EUA): Association for Tropical Biology and Conservation, 1989 - 6 páginas: 5 tablas
Incluye referencias bibliográficas en las páginas 13-14
Nitrification was measured during the rainy season in two undisturbed tropical rain forests and three slash-and-burn sites in the Amazon region of southwestern Venezuela. Nitrification was higher in the soils of the slash-and-burn sites than in the undisturbed forests. Rates of nitrate production were 14.9 mg/kg/30 days in a forest on an Oxisol, 3.5 mg/kg/30 days in a forest on Ultisol, 23.2 mg/kg/30 days in a 1.5-yr-old slash-and-burn agricultural site on an Oxisol, 12.9 mg/kg/30 days in a 0.5-yr-old slash-and-burn agricultural site on Ultisol, and 12.1 mg/kg/30 days in a 3.0-yr-old pasture on Ultisol. In the undisturbed forests, rates of nitrate production in the root mat averaged 93.5 mg/kg/30 days on Oxisols and 11.2 mg/kg/30 days on Ultisols. Nitrification rates closely followed total nitrogen mineralization rates. Ammonium availability appears to regulate nitrification in both the undisturbed forests and in the slash-and-burn sites. Rates of nitrification in the undisturbed forests in this Amazon site on poor soils were lower than in other tropical forests on more nutrient rich soils.
NITRATOS
BOSQUE HUMEDO
CULTIVO MIGRATORIO
BOSQUE VIRGEN
ZONA TROPICAL
AMAZONIA
VENEZUELA (REPUBLICA BOLIVARIANA DE)
Nitrification rates in two undisturbed tropical rain forests and three slash-and-burn sites of the Venezuela Amazon - Ithaka, (EUA): Association for Tropical Biology and Conservation, 1989 - 6 páginas: 5 tablas
Incluye referencias bibliográficas en las páginas 13-14
Nitrification was measured during the rainy season in two undisturbed tropical rain forests and three slash-and-burn sites in the Amazon region of southwestern Venezuela. Nitrification was higher in the soils of the slash-and-burn sites than in the undisturbed forests. Rates of nitrate production were 14.9 mg/kg/30 days in a forest on an Oxisol, 3.5 mg/kg/30 days in a forest on Ultisol, 23.2 mg/kg/30 days in a 1.5-yr-old slash-and-burn agricultural site on an Oxisol, 12.9 mg/kg/30 days in a 0.5-yr-old slash-and-burn agricultural site on Ultisol, and 12.1 mg/kg/30 days in a 3.0-yr-old pasture on Ultisol. In the undisturbed forests, rates of nitrate production in the root mat averaged 93.5 mg/kg/30 days on Oxisols and 11.2 mg/kg/30 days on Ultisols. Nitrification rates closely followed total nitrogen mineralization rates. Ammonium availability appears to regulate nitrification in both the undisturbed forests and in the slash-and-burn sites. Rates of nitrification in the undisturbed forests in this Amazon site on poor soils were lower than in other tropical forests on more nutrient rich soils.
NITRATOS
BOSQUE HUMEDO
CULTIVO MIGRATORIO
BOSQUE VIRGEN
ZONA TROPICAL
AMAZONIA
VENEZUELA (REPUBLICA BOLIVARIANA DE)