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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
26/04/1996 |
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Data da última atualização: |
26/04/1996 |
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Autoria: |
TIESSEN, H.; CUEVAS, E.; CHACON, P. |
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Título: |
The role of soil organic matter in sustaining soil fertility. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
Nature, v.371, n.6500, p.783-785, 1994. |
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Idioma: |
Inglês |
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Conteúdo: |
Many tropical soils are poor in inorganic nutrients and rely on the recycling of nutrients from soil organic matter to maintain fertility. In undisturbed rainforests such nutrients are recycled via yhr litterl slash-and-burn agriculture, meanwhile, depends on the mineralization of organic nutrients from the plant remains or on (short-lived) inputs from ash. This dependence on organic nutrients in tropical soil has the result that tests of soil quality which only give isolated measuresof inorganic nutrient status are unreliable, and that the effects of fertilization can be inconsistent because of leaching or fixation of inorganic nutrients. Here we attempt to quantify the role of organic matter to sustaining the fertility of soils from three different climatezones. We estimate rates of carbon turnover from ecological measurements and 14C dating, and determine its relation to the soil carbon and nutrient budgets. We find that agriculture without supplementary fertilization was economical for 65 years on temperate praire and for six years in a tropical semi-arid thorn forest. An extremely nutrient-poorAmazonan soil showed no potential for agriculture beyond the three-year lifespan of the forest litter mat, once biological nutrient cycles were interrupted by slash-burning. These observations suggest that quantification of organic-matter cycling may provide an important guide to the agricultural potential of soils. |
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Palavras-Chave: |
Fertility; Organicmatter; Solos tropicais. |
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Thesagro: |
Fertilidade; Matéria Orgânica; Mineralização. |
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Thesaurus Nal: |
mineralization; tropical soils. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02057naa a2200241 a 4500
001 1076875
005 1996-04-26
008 1994 bl --- 0-- u #d
100 1 $aTIESSEN, H.
245 $aThe role of soil organic matter in sustaining soil fertility.
260 $c1994
520 $aMany tropical soils are poor in inorganic nutrients and rely on the recycling of nutrients from soil organic matter to maintain fertility. In undisturbed rainforests such nutrients are recycled via yhr litterl slash-and-burn agriculture, meanwhile, depends on the mineralization of organic nutrients from the plant remains or on (short-lived) inputs from ash. This dependence on organic nutrients in tropical soil has the result that tests of soil quality which only give isolated measuresof inorganic nutrient status are unreliable, and that the effects of fertilization can be inconsistent because of leaching or fixation of inorganic nutrients. Here we attempt to quantify the role of organic matter to sustaining the fertility of soils from three different climatezones. We estimate rates of carbon turnover from ecological measurements and 14C dating, and determine its relation to the soil carbon and nutrient budgets. We find that agriculture without supplementary fertilization was economical for 65 years on temperate praire and for six years in a tropical semi-arid thorn forest. An extremely nutrient-poorAmazonan soil showed no potential for agriculture beyond the three-year lifespan of the forest litter mat, once biological nutrient cycles were interrupted by slash-burning. These observations suggest that quantification of organic-matter cycling may provide an important guide to the agricultural potential of soils.
650 $amineralization
650 $atropical soils
650 $aFertilidade
650 $aMatéria Orgânica
650 $aMineralização
653 $aFertility
653 $aOrganicmatter
653 $aSolos tropicais
700 1 $aCUEVAS, E.
700 1 $aCHACON, P.
773 $tNature$gv.371, n.6500, p.783-785, 1994.
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Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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| 1. |  | BASANTA, M. V.; DOURADO-NETO, D.; REICHARDT, K.; BACCHI, O. O. S.; OLIVEIRA, J. C. M.; TRIVELIN, P. C. O.; TIMM, L. C.; TOMINAGA, T. T.; CORRECHEL, V.; CÁSSARO, F. A. M.; PIRES, L. F.; MACEDO, J. R. de. Management effects on nitrogen recovery in a sugarcane crop grown in Brazil. Geoderma, v. 116, n. 1/2, p. 235-248, 2003.| Biblioteca(s): Embrapa Solos. |
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