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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
31/08/1995 |
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Data da última atualização: |
30/08/2010 |
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Autoria: |
BAKER, R. T. |
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Título: |
Changes in the chemical nature of soil organic phosphate during pedogenesis. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Journal of Soil Science, v.27, n.4, p.504-512, 1976. |
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Idioma: |
Inglês |
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Conteúdo: |
In two chronosequences of soils, total organic phosphate (Po) accumulated rapidly during the first 50 years of soil development, when organic matter increased and pH decreased. The rate of Po accumulation then declined with age of soil until a 'steady state' was reached. The amounts of phospholipid, inositol phosphates and humic acid - Po followed the same trends as the total Po. Parent materials and very young soils contained largely citric acid-soluble Po, but after less than 50 years, surface horizons accumulated sufficient organic matter to complex a considerable proportion of the Po. An upper limit of 20-5 per cent citric acid-soluble Po and 70-80 per cent Na)H-soluble Po was attained within 50 years of soil formation in the surface layers, and this slowly extended down the profile so that, after 10 000 yeras, the soil had 20 per cent citric acid soluble-Po and 70 per cent NaOH-soluble Po to a depth of r m. |
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Palavras-Chave: |
Chemical nature; Fosfato organico; Organic phosphate; Pedogenesis; Quimica natural. |
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Thesagro: |
Solo. |
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Thesaurus Nal: |
soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01478naa a2200205 a 4500
001 1785981
005 2010-08-30
008 1976 bl --- 0-- u #d
100 1 $aBAKER, R. T.
245 $aChanges in the chemical nature of soil organic phosphate during pedogenesis.
260 $c1976
520 $aIn two chronosequences of soils, total organic phosphate (Po) accumulated rapidly during the first 50 years of soil development, when organic matter increased and pH decreased. The rate of Po accumulation then declined with age of soil until a 'steady state' was reached. The amounts of phospholipid, inositol phosphates and humic acid - Po followed the same trends as the total Po. Parent materials and very young soils contained largely citric acid-soluble Po, but after less than 50 years, surface horizons accumulated sufficient organic matter to complex a considerable proportion of the Po. An upper limit of 20-5 per cent citric acid-soluble Po and 70-80 per cent Na)H-soluble Po was attained within 50 years of soil formation in the surface layers, and this slowly extended down the profile so that, after 10 000 yeras, the soil had 20 per cent citric acid soluble-Po and 70 per cent NaOH-soluble Po to a depth of r m.
650 $asoil
650 $aSolo
653 $aChemical nature
653 $aFosfato organico
653 $aOrganic phosphate
653 $aPedogenesis
653 $aQuimica natural
773 $tJournal of Soil Science$gv.27, n.4, p.504-512, 1976.
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