Data/hora: 17/06/2024 02:25:28

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	03/12/2012	
Data da última atualização: 	20/08/2013	
Autoria: 	FAGOTTI, D. S. L.; MIYAUCHI, M. Y. H.; OLIVEIRA, A. G.; SANTINONI, I. A.; EBERHARDT, D. N.; NIMTZ, A.; RIBEIRO, R. A.; PAULA, A. M.; QUEIROZ, C. A. S.; ANDRADE, G.; ZANGARO, W.; NOGUEIRA, M. A.	
Afiliação: 	Universidade Estadual de Londrina- UEL.; Universidade de São Paulo - USP; Universidade Estadual de Londrina - UEL.; Universidade Estadual de Londrina - UEL.; Universidade de São Paulo - USP.; Universidade Estadual de Londrina - UEL.; Universidade Estadual de Londrina - UEL.; Universidade de São Paulo - USP.; Universidade Estadual de Londrina - UEL.; Universidade Estadual de Londrina - UEL.; Universidade Estadual de Londrina - UEL; MARCO ANTONIO NOGUEIRA, CNPSO.	
Título: 	Gradients in N-cycling attributes along forestry and agricultural land-use systems are indicative of soil capacity for N supply.	
Ano de publicação: 	2012	
Fonte/Imprenta: 	Soil Use and Management, Oxford, v. 28, n. 3, p. 292-298, Sept. 2012.	
DOI: 	10.1111/j.1475-2743.2012.00418.x	
Idioma: 	Inglês	
Conteúdo: 	Indicators of soil quality associated with N-cycling were assessed under different land-use systems (native forest ? NAT, reforestation with Araucaria angustifolia or Pinus taeda and agricultural use ? AGR) to appraise the effects on the soil potential for N supply. The soil total N ranged from 2 to 4g&#8260; kg (AGR and NAT, respectively), and the microbial biomass N ranged from 80 to 250 mg&#8260; kg, being higher in NAT and A. angustifolia, and lower in P. taeda and AGR sites. Activities of asparaginase (ca. 50?200 mg NH 4 + -N &#8260; kg per h), glutaminase (ca. 200?800 mg NH -N &#8260; kg per h) and urease (ca. 80?200 mg NH -N &#8260; kg &#8260; h) were also more intense in the NAT and A. angustifoliareforested soils, indicating greater capacity for N mineralization. The NAT and AGR soils showed the highest and the lowest ammoni&#64257;cation rate, respectively (ca. 1 and 0.4 mg NH 4 + -N &#8260; kg per day), but the inverse for nitri&#64257;cation rate (ca. 12 and 26%), indicating a low capacity for N supply, in addition to higher risks of N losses in the AGR soil. A multivariate analysis indicated more similarity between NAT and A. angustifolia-reforested sites, whilst the AGR soil was different and associated with a higher nitri&#64257;cation rate. In general, reforestation with the native species A. angustifolia had less impact than reforestation with the exogenous species P. taeda, considering the soil capacity for N supply. However, AGR use caused more changes, generally decrease in indicators of N-cycling, showing a negative soil management effect on the sustainability of this agroecosystem.	
Thesagro: 	Amonificação; Nitrificação; Qualidade; Solo.	
Thesaurus Nal: 	Ammonification; Nitrification; Soil quality.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/71220/1/2012-SUM-V28-p292-298-Fagotti.pdf	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (33861-1) - UPC - AP - DD -  -  -  - DIS