Data/hora: 19/06/2024 11:51:43

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Data corrente: 	17/08/2011	
Data da última atualização: 	18/08/2011	
Autoria: 	XAVIER, F. A. da S.; MENDONÇA, E. de S.; CARDOSO, I. M.; ROIG, A.; GONZÁLEZ-VILA, F. J.	
Afiliação: 	FRANCISCO ALISSON DA SILVA XAVIER, CNPMF; Eduardo de Sá Mendonça, UFES; Irene Maria Cardoso, UFV; Asunción Roig, CEBAS; Francisco Javier González-Vila, IRNAS.	
Título: 	Structural characteristics of soil humic acids in coffee-cultivation systems: 13C NMR and analytical pyrolysis.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 33., 2011, Uberlândia. Solos nos biomas brasileiros: sustentabilidade e mudanças climáticas. [Uberlândia]: SBCS: UFU: ICIAG, 2011. 1 CD-ROM.	
Idioma: 	Inglês	
Notas: 	pdf 1519-1	
Conteúdo: 	Structural characterization of soil organic matter is still poorly understood in Brazilian agroecosystems. We aimed to identify the qualitative changes of soil humic acids as influenced by agroforestry- and full sun-coffee systems in the Atlantic Coastal Rainforest domain. The study was carried out in the Zona da Mata located in the state of Minas Gerais, Brazil. The specific studied sites were:agroforestry-coffee (AGF), Full sun coffee (FSC) and Native forest (NF) which was selected and used to determine the native or steady state condition of soil. Soil humic acids were extracted by using basic-acid medium, purified, and freeze-dried to a solid state to perform 13C NMR and analytical pyrolysis analyses. 13C NMR assignment of soil HAs from FSC system suggests an intensification of the process of humification of HAs structure. The higher aromaticity index of HAs from FSC compared to the AGF system confirmed this result. The relative abundance in each specific pyrolitic group was similar among the different land use, with exception to the higher amounts of lignin-like and lipids compounds in AGF compared to FSC system, and the higher abundance of N-compounds in FSC (37,0%) than in AGF (21,5%) system. Combining 13C NMR with Pyrolysis is an interesting tool to the study of structural features of HAs. Despite of the discrepancies, both techniques indicated that studied AGF systems favor the genesis of soil HAs with lower degree of humification when compared to FSC system, as a result of the influence of organic residues (fresh and old) from trees.	
Palavras-Chave: 	Zona da mata.	
Thesaurus Nal: 	agroforestry; carbon; spectroscopy.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/40034/1/id27808.pdf	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)	
Exemplares: 	CNPMF - (27808-1) - UPC - AA - PP - CD2011.002 -  - 2011.002 - PCT