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008			210628t 1989 ||||| |||| 00| 0 eng d
040			_aCR-TuBCO _cCR-TuBCO _bEspañol
041	0		_aeng
100	1		_995324 _aMontagnini, F.
100	1		_952112 _aBuschbacher, R.
245	1	0	_aNitrification rates in two undisturbed tropical rain forests and three slash-and-burn sites of the Venezuela Amazon
260			_aIthaka, (EUA): _bAssociation for Tropical Biology and Conservation, _c1989
270			_aSan José, C.R.
300			_a6 páginas: _b5 tablas
504			_aIncluye referencias bibliográficas en las páginas 13-14
520			_aNitrification 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.
650	1	4	_9156028 _aNITRATOS
650	1	4	_9138258 _aBOSQUE HUMEDO
650	1	4	_9143131 _aCULTIVO MIGRATORIO
650	1	4	_9138303 _aBOSQUE VIRGEN
650	1	4	_9168984 _aZONA TROPICAL
650	1	4	_9135570 _aAMAZONIA
650	1	4	_9168187 _aVENEZUELA (REPUBLICA BOLIVARIANA DE)
691			_9328591 _aNITRATES
691			_9335109 _aRAIN FORESTS
691			_9338214 _aSHIFTING CULTIVATION
691			_9342849 _aVIRGIN FORESTS
691			_9167489 _aTROPICAL ZONES
691			_aAMAZONIA _9346536
691			_aVENEZUELA (BOLIVARIAN REPUBLIC OF) _xVEN
773	0		_tBiotropica (EUA) _gVolumen 21, número 1, páginas 9-14 _d1989
856	4	0	_uhttps://doi.org/10.2307/2388435 _qpdf _yeng
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907			_a000028112
907			_a000007979
907			_a000032372
907			_a000008186
908			_aJ
942			_cDIG _2z