Data/hora: 07/06/2024 02:47:27

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 24/02/2012
Data da última atualização: | 17/04/2018
Autoria: | VIANA, L. T.; BUSTAMANTE, M. M. da C.; MOLINA, M.; PINTO, A. de S.; KISSELLE, K.; ZEPP, R.; BURKE, R. A.
Afiliação: | Laura Tillmann Viana, Agência Nacional de Águas; Mercedes Maria da Cunha Bustamante, Universidade de Brasília, Departamento de Ecologia; Marirosa Molina, United States Environmental Protection Agency; Alexandre de Siqueira Pinto, Universidade de Brasília, Departamento de Ecologia; Keith Kisselle, Austin College, Department of Biology and Environmental Studies; Richard Zepp, United States Environmental Protection Agency; Roger A. Burk, United States Environmental Protection Agency.
Título: | Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture.
Ano de publicação: | 2011
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 46, n. 12, p. 1665-1672, dez. 2011
Idioma: | Inglês
Notas: | Título em português: Comunidades microbianas de solos de Cerrado sob vegetação nativa sujeita a queimadas prescritas e sob pastagem.
Conteúdo: | The objective of this work was to evaluate the effects of fire regimes and vegetation cover on the structure and dynamics of soil microbial communities, through phospholipid fatty acid (PLFA) analysis. Comparisons were made between native areas with different woody covers ("cerrado stricto sensu" and "campo sujo"), under different fire regimes, and a 20-year-old active palisadegrass pasture in the Central Plateau of Brazil. Microbial biomass was higher in the native plots than in the pasture, and the highest monthly values were observed during the rainy season in the native plots. No significant differences were observed between fire regimes or between communities from the two native vegetation types. However, the principal component (PC) analysis separated the microbial communities by vegetation cover (native x pasture) and season (wet x dry), accounting for 45.8% (PC1 and PC3) and 25.6% (PC2 and PC3), respectively, of the total PLFA variability. Changes in land cover and seasonal rainfall in Cerrado ecosystems have significant effects on the total density of soil microorganisms and on the abundance of microbial groups, especially Gram-negative and Gram-positive bacteria.
Palavras-Chave: | Diversidade microbiana; Microbial diversity; PLFA; Sazonalidade; Seasonality.
Thesagro: | Uso da terra.
Thesaurus Nal: | land use; savannas.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/54603/1/46n12a12.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (52654-1) - UPE - AP - PP - 63072081 - P474 -  - DIS