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Registro Completo |
Biblioteca(s): |
Embrapa Instrumentação. |
Data corrente: |
25/04/2003 |
Data da última atualização: |
25/04/2003 |
Autoria: |
BAYER, C.; MARTIN-NETO, L.; MIELNICZUK, J.; SAAB, S. da C. MILORI, D. M. P.; BAGNATO, V. S. |
Afiliação: |
UFRGS-Departamento de Solos, Porto Alegre, RS; Embrapa Instrumentação Agropecuária, São Carlos, SP; UEPG-Departamento de Física, Ponta Grossa, PR; USP-Instituto de Física, São Carlos, SP. |
Título: |
Tillage and cropping system effects on soil humic acid characteristics as determined by electron spin resonance and fluorescence spectroscopies. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Geoderma, Amsterdam, v. 105, p. 81-92, 2002. |
Idioma: |
Inglês |
Conteúdo: |
long-term (- and 9-year) effects were evaluated of two tillage regimes (conventional tillage: CT; and no-tillage: NT) and two cropping systems (oat/maize: O/M; and oat + vetch / maize + cowpea: O + V/M+C) on characteristics of humic acids (HAs) from surface layer (0 to 25 mm) of subtropical Brazilian Paleudult soil. Generally, soil HA samples from conservation management systems with no soil disturbance (NT) and high crop residue addition (O+V/M+C) showed lowest humification degree, as demonstrated by lowest concentration of semiquinone-type free radicals, determined by electron spin resonance (ESR_, and lowest total fluorescence (TF), which is proportional to area under fluorescence spectrum; however, cropping systems had less effect than tillage regimes on two spectroscopic parameters. Since all HA samples presented a maximum fluorescence emission peak around 518nm, when excited with blue light, we believe that differences in the fluorescence intensity could be attributed to concentration of similar condensed aromatic moiety. This assumption was consistent with strong correlation with stable semiquinone-type free radicals (r=0.84, P<0.01), which are believed to be stabilized in humic substances by condensed aromatic structures. The results showed positive effects of conservation management in evaluating management system quality. |
Palavras-Chave: |
Aromatic groups; Brazilian soils; Espectroscopia; Fluorescência; Humidade; Humification degree; Semiquinone free radicals. |
Thesagro: |
Matéria Orgânica; Solo. |
Categoria do assunto: |
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Marc: |
LEADER 02191naa a2200277 a 4500 001 1024608 005 2003-04-25 008 2002 bl --- 0-- u #d 100 1 $aBAYER, C. 245 $aTillage and cropping system effects on soil humic acid characteristics as determined by electron spin resonance and fluorescence spectroscopies. 260 $c2002 520 $along-term (- and 9-year) effects were evaluated of two tillage regimes (conventional tillage: CT; and no-tillage: NT) and two cropping systems (oat/maize: O/M; and oat + vetch / maize + cowpea: O + V/M+C) on characteristics of humic acids (HAs) from surface layer (0 to 25 mm) of subtropical Brazilian Paleudult soil. Generally, soil HA samples from conservation management systems with no soil disturbance (NT) and high crop residue addition (O+V/M+C) showed lowest humification degree, as demonstrated by lowest concentration of semiquinone-type free radicals, determined by electron spin resonance (ESR_, and lowest total fluorescence (TF), which is proportional to area under fluorescence spectrum; however, cropping systems had less effect than tillage regimes on two spectroscopic parameters. Since all HA samples presented a maximum fluorescence emission peak around 518nm, when excited with blue light, we believe that differences in the fluorescence intensity could be attributed to concentration of similar condensed aromatic moiety. This assumption was consistent with strong correlation with stable semiquinone-type free radicals (r=0.84, P<0.01), which are believed to be stabilized in humic substances by condensed aromatic structures. The results showed positive effects of conservation management in evaluating management system quality. 650 $aMatéria Orgânica 650 $aSolo 653 $aAromatic groups 653 $aBrazilian soils 653 $aEspectroscopia 653 $aFluorescência 653 $aHumidade 653 $aHumification degree 653 $aSemiquinone free radicals 700 1 $aMARTIN-NETO, L. 700 1 $aMIELNICZUK, J. 700 1 $aSAAB, S. da C. MILORI, D. M. P. 700 1 $aBAGNATO, V. S. 773 $tGeoderma, Amsterdam$gv. 105, p. 81-92, 2002.
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1. | | RAHMATI, M.; WEIHERMÜLLER, L.; VANDERBORGHT, J.; PACHEPSKY, Y. A.; MAO, L.; SADEGHI, S. H.; MOOSAVI, N.; KHEIRFAM, H.; MONTZKA, C.; VAN LOOY, K.; TOTH, B.; HAZBAVI, Z.; AL YAMANI, W.; ALBALASMEH, A. A.; ALGHZAWI, M. Z.; ANGULO-JARAMILLO, R.; ANTONINO, A. C. D.; ARAMPATZIS, G.; ARMINDO, R. A.; ASADI, H.; BAMUTAZE, Y.; BATLLE-AGUILAR, J.; BÉCHET, B.; BECKER, F.; BLÖSCHL, G.; BOHNE, K.; BRAUD, I.; CASTELLANO, C.; CERDÀ, A.; CHALHOUB, M.; CICHOTA, R.; CÍSLEROVÁ, M.; CLOTHIER, B.; COQUET, Y.; CORNELIS, W.; CORRADINI, C.; COUTINHO, A. P.; OLIVEIRA, M. B. de; MACEDO, J. R. de; DURÃES, M. F.; EMAMI, H.; ESKANDARI, I.; FARAJNIA, A.; FLAMMINI, A.; FODOR, N.; GHARAIBEH, M.; GHAVIMIPANAH, M. H.; GHEZZEHEI, T. A.; GIERTZ, S.; HATZIGIANNAKIS, E. G.; HORN, R.; JIMÉNEZ, J. J.; JACQUES, D.; KEESSTRA, S. D.; KELISHADI, H.; KIANI-HARCHEGANI, M.; KOUSELOU, M.; KUMAR JHA, M.; LASSABATERE, L.; LI, X.; LIEBIG, M. A.; LICHNER, L.; LÓPEZ, M. V.; MACHIWAL, D.; MALLANTS, D.; MALLMANN, M. S.; MARQUES, J. D. de O.; MARSHALL, M. R.; MERTENS, J.; MEUNIER, F.; MOHAMMADI, M. H.; MOHANTY, B. P.; PULIDO-MONCADA, M.; MONTENEGRO, S.; MORBIDELLI, R.; MORET-FERNÁNDEZ, D.; MOOSAVI, A. A.; MOSADDEGHI, M. R.; MOUSAVI, S. B.; MOZAFFARI, H.; NABIOLLAHI, K.; NEYSHABOURI, M. R.; OTTONI, M. V.; OTTONI FILHO, T. B.; PAHLAVAN-RAD, M. R.; PANAGOPOULOS, A.; PETH, S.; PEYNEAU, P.-E.; PICCIAFUOCO, T.; POESEN, J.; PULIDO, M.; REINERT, D. J.; REINSCH, S.; REZAEI, M.; ROBERTS, F. P.; ROBINSON, D.; RODRIGO-COMINO, J.; ROTUNNO FILHO, O. C.; SAITO, T.; SUGANUMA, H.; SALTALIPPI, C.; SÁNDOR, R.; SCHÜTT, B.; SEEGER, M.; SEPEHRNIA, N.; SHARIFI MOGHADDAM, E.; SHUKLA, M.; SHUTARO, S.; SORANDO, R.; STANLEY, A. A.; STRAUSS, P.; SU, Z.; TAGHIZADEH-MEHRJARDI, R.; TAGUAS, E.; TEIXEIRA, W. G.; VAEZI, A. R.; VAFAKHAH, M.; VOGEL, T.; VOGELER, I.; VOTRUBOVA, J.; WERNER, S.; WINARSKI, T.; YILMAZ, D.; YOUNG, M. H.; ZACHARIAS, S.; ZENG, Y.; ZHAO, Y.; ZHAO, H.; VEREECKEN, H. Development and analysis of the Soil Water Infiltration Global database. Earth System Science Data, v. 10, n. 3, p. 1237-1263, 2018.Biblioteca(s): Embrapa Solos. |
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