Microbiological functioning, diversity, and structure of bacterial communities in ultramafic soils from a tropical savanna

作者：Pessoa Filho Marco; Barreto Cristine Chaves; dos Reis Junior Fabio Bueno; Fragoso Rodrigo Rocha; Costa Flavio Silva; Mendes Ieda de Carvalho; Miranda de Andrade Leide Rovnia

来源：Antonie van Leeuwenhoek, 2015, 107(4): 935-949.

DOI：10.1007/s10482-015-0386-6

• Cerrado
• Metals
• Soil enzymes
• Microbial biomass carbon
• 16S rRNA gene

Ultramafic soils are characterized by high levels of metals, and have been studied because of their geochemistry and its relation to their biological component. This study evaluated soil microbiological functioning (SMF), richness, diversity, and structure of bacterial communities from two ultramafic soils and from a non-ultramafic soil in the Brazilian Cerrado, a tropical savanna. SMF was represented according to simultaneous analysis of microbial biomass C (MBC) and activities of the enzymes beta-glucosidase, acid phosphomonoesterase and arylsulfatase, linked to the C, P and S cycles. Bacterial community diversity and structure were studied by sequencing of 16S rRNA gene clone libraries. MBC and enzyme activities were not affected by high Ni contents. Changes in SMF were more related to the organic matter content of soils (SOM) than to their available Ni. Phylogeny-based methods detected qualitative and quantitative differences in pairwise comparisons of bacterial community structures of the three sites. However, no correlations between community structure differences and SOM or SMF were detected. We believe this work presents benchmark information on SMF, diversity, and structure of bacterial communities for a unique type of environment within the Cerrado biome.

• 出版日期2015-4