Data/hora: 10/06/2024 02:20:15

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	02/04/2003	
Data da última atualização: 	02/04/2003	
Autoria: 	JORDAN, C. F.; STARK, N.	
Título: 	Nutrient retention by the root mat of an Amazonian rain forest.	
Título original: 	Retencion de nutrientes en la estera de raices de un bosque pluvial amazonico.	
Ano de publicação: 	1978	
Fonte/Imprenta: 	Acta Cientifica Venezolana, v.29, n.4, p.263-267, 1978.	
Idioma: 	Espanhol	
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.	
Palavras-Chave: 	Regions; Retencao; Water relations.	
Thesagro: 	Absorção; Lixiviação; Nutriente.	
Thesaurus Nal: 	forests; nutrients; physiology; rain forests; roots; soil chemistry; soil water; trees; tropical rain forests; vegetation types.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (1126-1) - ADC - SP - -- - SP0198 -  - SP0198 - DIS