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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
13/08/2004 |
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Data da última atualização: |
08/03/2010 |
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Autoria: |
SILVA, A. C.; TORRADO, P. V.; MARTIN-NETO, L.; VASQUEZ, F. M.; GONZALEZ-PEREZ, M. |
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Título: |
Soil organic matter and geomorphic surface stability relationship in an Oxisol Toposequence (SE Brazil). |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
In: MARTIN-NETO, L.; MILORI, D.M.B.P.; SILVA, W.T.L. (Ed.). Humic substances and soil and water environment: International Meeting of IHSS, 12. São Carlos : Embrapa Instrumentação Agropecuária, 2004. p. 623-626. |
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Idioma: |
Inglês |
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Notas: |
CLASSIFICAÇÃO CDD: 630 |
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Conteúdo: |
I. INTRODUCTION
Relieve is among soil formation factors, the one that contrais matter distribution in the soil system. The understanding of soil-landscape relations has been facilitated through utilization of topographic attributes, such as declivity, to establish relations with pedogenetic processes (Silva and Vidal Torrado, 1999). Accumulation and humification degree of organic matter, for example, can be correlated with soil declivity. In well-drained areas, the general rule is the smaller the declivity the bigger the rate of organic matter (OM) accumulation and humification degree, remaining constant the other soil formation factors (Silva and Vidal Torrado, 1999). Thus, the organic carbon content t would be higher as much as OM structure more complex at the summit of the slope than at back slope, where the carbon content would be lower and OM structure simpler. Thus, the content of charcoal fragments found at soil surface horizons would be higher and their radiocarbon age older, in areas with low declivity than in areas with high declivity, as the former areas suftered low influence of hydric erosion (Pessenda et al., 1996; Silva and Vidal Torrado, 1999). Riffaldi and Schnitzer (1972) report that semiquinone -type free radicais are stabilized with complex aromatic structures in humic substances. Thus, the free radical concentration of humic substances should decrease with increasing declivity and consequently the stability of geomorphic surfaces should decrease.
Declivity is an attribute of relieve that is related to the accumulation and stability of organic matter in the soil. For this reason, in this paper were quantitatively evaluated relations among declivity, the humification degree of humic acids, the charcoal fragment content and its radiocarbon age. MenosI. INTRODUCTION
Relieve is among soil formation factors, the one that contrais matter distribution in the soil system. The understanding of soil-landscape relations has been facilitated through utilization of topographic attributes, such as declivity, to establish relations with pedogenetic processes (Silva and Vidal Torrado, 1999). Accumulation and humification degree of organic matter, for example, can be correlated with soil declivity. In well-drained areas, the general rule is the smaller the declivity the bigger the rate of organic matter (OM) accumulation and humification degree, remaining constant the other soil formation factors (Silva and Vidal Torrado, 1999). Thus, the organic carbon content t would be higher as much as OM structure more complex at the summit of the slope than at back slope, where the carbon content would be lower and OM structure simpler. Thus, the content of charcoal fragments found at soil surface horizons would be higher and their radiocarbon age older, in areas with low declivity than in areas with high declivity, as the former areas suftered low influence of hydric erosion (Pessenda et al., 1996; Silva and Vidal Torrado, 1999). Riffaldi and Schnitzer (1972) report that semiquinone -type free radicais are stabilized with complex aromatic structures in humic substances. Thus, the free radical concentration of humic substances should decrease with increasing declivity and consequently the stability of geomorphic surfaces should decrease.
Dec... Mostrar Tudo |
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Palavras-Chave: |
C14; dectivity; EPR; humification degree; soil charcoal; Soil humic acids. |
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Categoria do assunto: |
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Marc: |
LEADER 02673naa a2200253 a 4500
001 1028581
005 2010-03-08
008 2004 bl --- 0-- u #d
100 1 $aSILVA, A. C.
245 $aSoil organic matter and geomorphic surface stability relationship in an Oxisol Toposequence (SE Brazil).
260 $c2004
500 $aCLASSIFICAÇÃO CDD: 630
520 $aI. INTRODUCTION Relieve is among soil formation factors, the one that contrais matter distribution in the soil system. The understanding of soil-landscape relations has been facilitated through utilization of topographic attributes, such as declivity, to establish relations with pedogenetic processes (Silva and Vidal Torrado, 1999). Accumulation and humification degree of organic matter, for example, can be correlated with soil declivity. In well-drained areas, the general rule is the smaller the declivity the bigger the rate of organic matter (OM) accumulation and humification degree, remaining constant the other soil formation factors (Silva and Vidal Torrado, 1999). Thus, the organic carbon content t would be higher as much as OM structure more complex at the summit of the slope than at back slope, where the carbon content would be lower and OM structure simpler. Thus, the content of charcoal fragments found at soil surface horizons would be higher and their radiocarbon age older, in areas with low declivity than in areas with high declivity, as the former areas suftered low influence of hydric erosion (Pessenda et al., 1996; Silva and Vidal Torrado, 1999). Riffaldi and Schnitzer (1972) report that semiquinone -type free radicais are stabilized with complex aromatic structures in humic substances. Thus, the free radical concentration of humic substances should decrease with increasing declivity and consequently the stability of geomorphic surfaces should decrease. Declivity is an attribute of relieve that is related to the accumulation and stability of organic matter in the soil. For this reason, in this paper were quantitatively evaluated relations among declivity, the humification degree of humic acids, the charcoal fragment content and its radiocarbon age.
653 $aC14
653 $adectivity
653 $aEPR
653 $ahumification degree
653 $asoil charcoal
653 $aSoil humic acids
700 1 $aTORRADO, P. V.
700 1 $aMARTIN-NETO, L.
700 1 $aVASQUEZ, F. M.
700 1 $aGONZALEZ-PEREZ, M.
773 $tIn: MARTIN-NETO, L.; MILORI, D.M.B.P.; SILVA, W.T.L. (Ed.). Humic substances and soil and water environment: International Meeting of IHSS, 12. São Carlos : Embrapa Instrumentação Agropecuária, 2004. p. 623-626.
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Embrapa Instrumentação (CNPDIA) |
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