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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
24/03/2003 |
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Data da última atualização: |
21/12/2011 |
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Autoria: |
NEUFELDT, H.; RESCK, D. V. S.; AYARZA, M. A. |
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Título: |
Texture and land-use effects on soil organic matter in Cerrado Oxisols, Central Brazil. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Geoderma, Amsterdam, v. 107, p. 151-164, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
Due to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisation of organic matter in Cerrado soils follow along a biogechemical gradient similar to that of temperate soils and climates. MenosDue to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisa... Mostrar Tudo |
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Thesagro: |
Cerrado; Cobertura do Solo; Matéria Orgânica; Solo. |
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Categoria do assunto: |
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Marc: |
LEADER 02157naa a2200193 a 4500
001 1566612
005 2011-12-21
008 2002 bl --- 0-- u #d
100 1 $aNEUFELDT, H.
245 $aTexture and land-use effects on soil organic matter in Cerrado Oxisols, Central Brazil.
260 $c2002
520 $aDue to the continuous agricultural expansion in the Brazilian Cerrados and the known adverse effects of agriculture on soil organic matter (SOM), SOM dynamics of typical Cerrado land-use systems were studied. Bulk soil samples and particle-size separates from clayey and loamy Oxisols under to characterise texture and tratament effects on SOM and to follow the alterations of organic compounds in the different particle-size fractions. The analyscs included na assessment of SOM, particulate organic matter (POM), polysaccharides, lignin oxidation products (VSC-lingnin), and scanning electron microscopy (SEM) of different particle-size fractions.The amounts of SOM, polysaccharides, and VSC-lignin were elearly higther in the clayey soils due to the increasing stabilisation of organic substances to the clay fraction. Conversely, the amounts of POM were comparable between the substrates resulting in a higher proportion of labile organic matter, and thus na overall greater lability of the loamy soils.Continuous cropping and reforestation with pine led to a clear redution of SOM contents, whereas pasture and eucalyptus reforestation might have increased both the amount and quality of SOM in relation to the Cerrado control.The analysis of particle-size separates showed the decline of lignin and plant-derived polysaccharides from the sand to the clay fraction, and na accumulation of microbially metabolised polysaccharides in the clay fraction, suggesting that humification and mineralisation of organic matter in Cerrado soils follow along a biogechemical gradient similar to that of temperate soils and climates.
650 $aCerrado
650 $aCobertura do Solo
650 $aMatéria Orgânica
650 $aSolo
700 1 $aRESCK, D. V. S.
700 1 $aAYARZA, M. A.
773 $tGeoderma, Amsterdam$gv. 107, p. 151-164, 2002.
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Registro original: |
Embrapa Cerrados (CPAC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio Ambiente. Para informações adicionais entre em contato com cnpma.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
13/04/1998 |
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Data da última atualização: |
22/11/2016 |
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Autoria: |
MEZZALAMA, M.; GHINI, R.; RUFFA, P.; AMBROSOLI, R.; GARIBALDI, A. |
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Afiliação: |
MONICA MEZZALAMA, UNIVERSITY OF TORINO -ITALY; RAQUEL GHINI, CNPMA; PAOLA RUFFA, UNIVERSITY OF TORINO -ITALY; ROBERTO AMBROSOLI, UNIVERSITY OF TORINO -ITALY; ANGELO GARIBALDI, UNIVERSITY OF TORINO -ITALY. |
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Título: |
Effects of antagonistic Fusarium oxysporum on functional groups of indigenous bacteria in soil. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Applied Soil Ecology, v.7, p.31-40, 1997. |
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Idioma: |
Inglês |
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Conteúdo: |
Before planning the commercial use of microorganisms, genetically manipulated or not, in agricultural environments, their behavior and potential impact on soil ecosystems should be carefully studied as part of risk assessment. The influence of added inoculum of antagonistic Fusarium oxysporum strains, genetically manipulated (T26/6) or not (233/1) on nitrogen and carbon functional groups were evaluated in three soils from different sites at Albenga in Northwestern Italy, one natural and two other previously solarized, and in a fourth soil obtained from a site at Carignano (Northwestern Italy) with a 10-year-old poplar stand. There were no detectable effects of the antagonistic Fusarium strains on ammonifiers, ammonium oxidizers, nitrite oxidizers, nonsymbioticaerobic nitrogen fixers and denitrifiers evaluated with the most probable number (MPN) method. Also, no effects were observed on amylolytic, proteolytic, cellulolytic, pectolytic and total bacteria evaluated with the plate count (PC) method. Survival and population dynamics of the antagonistic Fusarium strains were monitored during the experiments, and a decline over time of the introduced microorganisms was assessd. |
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Palavras-Chave: |
Antagonistic fungus; Antagonistic strains; Resistance; Soil infestation; Survival. |
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Thesaurus NAL: |
microbial pesticides; risk assessment. |
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Categoria do assunto: |
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Marc: |
LEADER 01912naa a2200253 a 4500
001 1012822
005 2016-11-22
008 1997 bl uuuu u00u1 u #d
100 1 $aMEZZALAMA, M.
245 $aEffects of antagonistic Fusarium oxysporum on functional groups of indigenous bacteria in soil.$h[electronic resource]
260 $c1997
520 $aBefore planning the commercial use of microorganisms, genetically manipulated or not, in agricultural environments, their behavior and potential impact on soil ecosystems should be carefully studied as part of risk assessment. The influence of added inoculum of antagonistic Fusarium oxysporum strains, genetically manipulated (T26/6) or not (233/1) on nitrogen and carbon functional groups were evaluated in three soils from different sites at Albenga in Northwestern Italy, one natural and two other previously solarized, and in a fourth soil obtained from a site at Carignano (Northwestern Italy) with a 10-year-old poplar stand. There were no detectable effects of the antagonistic Fusarium strains on ammonifiers, ammonium oxidizers, nitrite oxidizers, nonsymbioticaerobic nitrogen fixers and denitrifiers evaluated with the most probable number (MPN) method. Also, no effects were observed on amylolytic, proteolytic, cellulolytic, pectolytic and total bacteria evaluated with the plate count (PC) method. Survival and population dynamics of the antagonistic Fusarium strains were monitored during the experiments, and a decline over time of the introduced microorganisms was assessd.
650 $amicrobial pesticides
650 $arisk assessment
653 $aAntagonistic fungus
653 $aAntagonistic strains
653 $aResistance
653 $aSoil infestation
653 $aSurvival
700 1 $aGHINI, R.
700 1 $aRUFFA, P.
700 1 $aAMBROSOLI, R.
700 1 $aGARIBALDI, A.
773 $tApplied Soil Ecology$gv.7, p.31-40, 1997.
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