Data/hora: 24/05/2024 03:23:39

Biblioteca(s): | Embrapa Soja.
Data corrente: | 09/07/2012
Data da última atualização: | 09/07/2012
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: | D. S. L. FAGOTTI, UEL; M. Y. H. MIYAUCHI, ESALQ - USP; A. G. OLIVEIRA, UEL; I. A. SANTINONI, UEL; D. N. EBERHARDT, ESALQ - USP; A. NIMTZ, UEL; R. A. RIBEIRO, UEL; A. M. PAULA, ESALQ - USP; C. A. S. QUEIROZ, UEL; G. ANDRADE, UEL; W. ZANGARO, UEL; MARCO ANTONIO NOGUEIRA, UEL.
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, p. 1-7, 2012.
Páginas: | 7 p.
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
4 g&#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 NH4 +-N &#8260; kg per h), glutaminase (ca. 200?800 mg NH4 +-N &#8260; kg per h) and urease (ca. 80?200 mg NH4 +-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 ammonification rate, respectively (ca. 1 and 0.4 mg NH4 +-N &#8260; kg per day), but the inverse for nitrification 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 nitrification 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; Araucária Angustifólia; Solo.
Thesaurus Nal: | ammonification; soil.
Categoria do assunto: | --
Registro original: | Embrapa Soja (CNPSO)
Exemplares: | CNPSO - (33199-1) - ADD - SP - PP - 9351 -  - 9351 - DIS