Soil microbiome responses to the short-term effects of Amazonian deforestation

Autor(es)

Navarrete, Acacio A. ^{[1, 2]} ; Tsai, Siu M. ^[2] ; Mendes, Lucas W. ^{[1, 2]} ; Faust, Karoline ^[3] ; de Hollander, Mattias ^[1] ; Cassman, Noriko A. ^[1] ; Raes, Jeroen ^[3] ; van Veen, Johannes A. ^{[1, 4]} ; Kuramae, Eiko E. ^[1]

Afiliação do(s) autor(es)

^[1] Netherlands Inst Ecol NIOO KNAW, Dept Microbial Ecol, NL-6708 PB Wageningen - Netherlands

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, Cell & Mol Biol Lab, BR-13400970 Piracicaba, SP - Brazil

^[3] Katholieke Univ Leuven, Rega Inst, Dept Microbiol & Immunol, B-3000 Leuven - Belgium

^[4] Leiden Univ, Inst Biol, NL-2300 RA Leiden - Netherlands

• Tipo de documento: Artigo Científico
• Fonte: Molecular Ecology; v. 24, n. 10, p. 2433-2448, MAY 2015.
• Citações Web of Science: 42

Resumo

Slash-and-burn clearing of forest typically results in increase in soil nutrient availability. However, the impact of these nutrients on the soil microbiome is not known. Using next generation sequencing of 16S rRNA gene and shotgun metagenomic DNA, we compared the structure and the potential functions of bacterial community in forest soils to deforested soils in the Amazon region and related the differences to soil chemical factors. Deforestation decreased soil organic matter content and factors linked to soil acidity and raised soil pH, base saturation and exchangeable bases. Concomitant to expected changes in soil chemical factors, we observed an increase in the alpha diversity of the bacterial microbiota and relative abundances of putative copiotrophic bacteria such as Actinomycetales and a decrease in the relative abundances of bacterial taxa such as Chlamydiae, Planctomycetes and Verrucomicrobia in the deforested soils. We did not observe an increase in genes related to microbial nutrient metabolism in deforested soils. However, we did observe changes in community functions such as increases in DNA repair, protein processing, modification, degradation and folding functions, and these functions might reflect adaptation to changes in soil characteristics due to forest clear-cutting and burning. In addition, there were changes in the composition of the bacterial groups associated with metabolism-related functions. Co-occurrence microbial network analysis identified distinct phylogenetic patterns for forest and deforested soils and suggested relationships between Planctomycetes and aluminium content, and Actinobacteria and nitrogen sources in Amazon soils. The results support taxonomic and functional adaptations in the soil bacterial community following deforestation. We hypothesize that these microbial adaptations may serve as a buffer to drastic changes in soil fertility after slash-and-burning deforestation in the Amazon region. (AU)

• Processo FAPESP: 08/58114-3 - Monitoring the microbial diversity and functional activities in response to land-use changes and deforestation under soybean and sugarcane cultivations
• Beneficiário: Tsai Siu Mui
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático