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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
02/04/2003 |
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Data da última atualização: |
02/04/2003 |
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Autoria: |
JORDAN, C. F.; STARK, N. |
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Título: |
Nutrient retention by the root mat of an Amazonian rain forest. |
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Título original: |
Retencion de nutrientes en la estera de raices de un bosque pluvial amazonico. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Acta Cientifica Venezolana, v.29, n.4, p.263-267, 1978. |
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Idioma: |
Espanhol |
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Conteúdo: |
Surface root mats on oxisols and spodosols near San Carlos de Rio Negro, Venezuela, were sprayed with 45Ca and 32P to simulate the addition of nutrients to the soil surface through leaching of decomposing litter, and through precipitation and throughfall. Collections from lysimeters placed below the root mat and humus layer showed that in all but one case, < 0.1% of the radiotracers leached past the root-organic mat, and leaching stopped completely after 1 to 2 months. Through analysis of root mat samples, the radioisotopes were found to have been taken up and translocated by living roots. This is the first evidence supporting the ability of the root mat on the surface of depleted tropical soils to efficiently take up dissolved nutrients before they percolate to mineral soil. |
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Palavras-Chave: |
Regions; Retencao; Water relations. |
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Thesagro: |
Absorção; Lixiviação; Nutriente. |
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Thesaurus Nal: |
forests; nutrients; physiology; rain forests; roots; soil chemistry; soil water; trees; tropical rain forests; vegetation types. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01693naa a2200337 a 4500
001 1278679
005 2003-04-02
008 1978 bl --- 0-- u #d
100 1 $aJORDAN, C. F.
240 $aRetencion de nutrientes en la estera de raices de un bosque pluvial amazonico.
245 $aNutrient retention by the root mat of an Amazonian rain forest.
260 $c1978
520 $aSurface root mats on oxisols and spodosols near San Carlos de Rio Negro, Venezuela, were sprayed with 45Ca and 32P to simulate the addition of nutrients to the soil surface through leaching of decomposing litter, and through precipitation and throughfall. Collections from lysimeters placed below the root mat and humus layer showed that in all but one case, < 0.1% of the radiotracers leached past the root-organic mat, and leaching stopped completely after 1 to 2 months. Through analysis of root mat samples, the radioisotopes were found to have been taken up and translocated by living roots. This is the first evidence supporting the ability of the root mat on the surface of depleted tropical soils to efficiently take up dissolved nutrients before they percolate to mineral soil.
650 $aforests
650 $anutrients
650 $aphysiology
650 $arain forests
650 $aroots
650 $asoil chemistry
650 $asoil water
650 $atrees
650 $atropical rain forests
650 $avegetation types
650 $aAbsorção
650 $aLixiviação
650 $aNutriente
653 $aRegions
653 $aRetencao
653 $aWater relations
700 1 $aSTARK, N.
773 $tActa Cientifica Venezolana$gv.29, n.4, p.263-267, 1978.
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Registro original: |
Embrapa Florestas (CNPF) |
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