Data/hora: 24/06/2024 05:35:44

Biblioteca(s): 	Embrapa Milho e Sorgo; Embrapa Solos.	
Data corrente: 	24/01/2006	
Data da última atualização: 	29/05/2018	
Autoria: 	BENITES, V. de M.; MENDONCA, E. de S.; SCHAEFER, C. E. G. R.; NOVOTNY, E. H.; REIS, E. L.; KER, J. C.	
Afiliação: 	Embrapa Milho e Sorgo.	
Título: 	Properties of black soil humic acids from high altitude rocky complexes in Brazil.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Geoderma, Amsterdam, v. 127, n. 1/2, p. 104-113, 2005.	
Idioma: 	Inglês	
Conteúdo: 	Forty two samples of black soils were collected from superficial horizons of the High Altitude Rocky Complex (HARC) that is situated on top of the most prominent mountain ranges of eastern Brazil. Our objective was to characterize the humic acids extracted from these pedoenvironments and evaluate the effect of natural paleo-fires on thermogravimetric properties, elemental composition, visible and infrared absorption of humic acids (HA). The high thermostability, low H:C ratio, and abundance in carboxylic groups, suggest that the HARC black soil HA present larger biostability and reactivity. The molecular characteristics indicated that HARC black soil HAs have a great contribution of transformed charred vegetable residues on its origin. This persistence and reactivity of black soil HA explain the capacity of these soils to maintain their cation exchange capacity, since the soil clay fraction is composed predominantly by low activity minerals.	
Palavras-Chave: 	Black carbon; FTIR.	
Thesagro: 	Solo Tropical.	
Thesaurus Nal: 	charcoal; humic acids; tropical soils.	
Categoria do assunto: 	--
P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Milho e Sorgo (CNPMS)	
Exemplares: 	CNPMS - (18290-1) - UPC - AP - DD -  -  -  - DIS
CNPS - (20271-1) - UPC - AP - DD -  -  - 2019.00181 - DIS