6533b870fe1ef96bd12cee9d

RESEARCH PRODUCT

How build up soil bacterial co-occurrence networks from wide spatial scalesampling?

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description

National audience; Although land use drives soil bacterial diversity and community structure, littleinformation about the bacterial interaction networks is available. Here, we investigatedbacterial co-occurrence networks in soils under different types of land use (forests, grasslands,crops and vineyards) by sampling 1798 sites in the French Soil Quality Monitoring Networkcovering all of France. An increase in bacterial richness was observed from forests tovineyards, whereas network complexity respectively decreased from 16,430 links to 2,046.However, the ratio of positive to negative links within the bacterial networks ranged from 2.9 inforests to 5.5 in vineyards. Networks structure was centered on the most connected genera(called hub), which belonged to Bacteroidetes in forest and grassland soils, but toActinobacteria in vineyard soils. Overall, our study revealed that soil perturbation due tointensive cropping reduces strongly the complexity of bacterial network although the richness isincreased. Moreover, the hub genera within the bacterial community shifted from copiotrophictaxa in forest soils to more oligotrophic taxa in agricultural soils.