Data/hora: 13/06/2024 07:21:26

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