Land-use system shapes soil bacterial communities in Southeastern Amazon region

Author(s)

Mendes, Lucas William ^{[1, 2]} ; de Lima Brossi, Maria Julia ^[2] ; Kuramae, Eiko Eurya ^[1] ; Tsai, Siu Mui ^[2]

Affiliation

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

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

• Document type: Journal article
• Source: APPLIED SOIL ECOLOGY; v. 95, p. 151-160, NOV 2015.
• Web of Science Citations: 37

Abstract

The expansion of the agriculture has become the main agent of disturbance in the Amazon region, and such alteration has consequences on soil microbial communities, which represent the majority of biodiversity in terrestrial ecosystems. In this study we assessed the effects of land-use changes on physicochemical soil properties and, consequently, on the bacterial communities in soils from Southeastern Amazon, Brazil. Soil samples were collected in four distinct land-use systems, i.e. native forest, deforested area, agricultural and pasture fields. The soil bacterial community abundance, structure and composition were addressed using qPCR, one molecular marker (T-RFLP) and high-throughput sequencing of the bacterial 16S rRNA gene, respectively. Obtained data were analyzed using multivariate techniques. We found that the type of land-use had a primary effect on the soil bacterial communities, whereas parameters such as pH, C, N, NO3- and K content significantly correlated to overall community structures. We observed that the abundance and taxonomic diversity of the bacterial 16S rRNA changed to a higher extent according to the land-use system, but they also showed significant temporal turnover within sites. From the total 27 bacterial phyla identified, 12 presented clearly differential distribution across the four land-use systems. Comparison among all sites revealed Acidobacteria and Chlamydiae to be higher abundant in forest soil, Actinobacteria in deforested site, Nitrospira and Deinococcus-Thermus in agriculture and Firmicutes in pasture. When data of specific phyla were correlated to specific soil properties, we demonstrated that parameters such as Al saturation index, Al, base saturation index, Mg and Ca presented correlation with the most number of bacterial groups detected. Thus, we suggest that several soil parameters besides pH should be taken into account when assessing the impacts of land-use change on the microbial communities. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 10/20353-7 - Analysis of microbial communities in soils under different land uses on the frontier of agricultural expansion in Southwestern Amazonia
• Grantee: Lucas William Mendes
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 11/51749-6 - Functional bioindicators for soil quality monitoring for sustainable management of sugarcane biomass production (BIOSQ)
• Grantee: Tsai Siu Mui
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 08/58114-3 - Monitoring the microbial diversity and functional activities in response to land-use changes and deforestation under soybean and sugarcane cultivations
• Grantee: Tsai Siu Mui
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants