Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture

Pesquisa Agropecuária Brasileira

Laura Tillmann Viana¹  Mercedes Maria Da Cunha Bustamante²  Marirosa Molina¹  Alexandre De Siqueira Pinto²  Keith Kisselle¹  Richard Zepp¹  Roger A Burke¹ 

[1] ,Universidade de Brasília Departamento de Ecologia Brasília DF ,Brazil

关键词: land use;    microbial diversity;    PLFA;    savannas;    seasonality;    uso da terra;    diversidade microbiana;    PLFA;    savanas;    sazonalidade;   

DOI  :  10.1590/S0100-204X2011001200012

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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