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Front Microbiol. 2019 Jul 2;10:1486. doi: 10.3389/fmicb.2019.01486. eCollection 2019.

Soil Salinity and pH Drive Soil Bacterial Community Composition and Diversity Along a Lateritic Slope in the Avon River Critical Zone Observatory, Western Australia.

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Biological Sciences, University of Southampton, Southampton, United Kingdom.
National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, Santa Barbara, CA, United States.
U.S. Bureau of Reclamation, Denver Federal Center, Denver, CO, United States.
Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, CO, United States.
Department of Biological Sciences, Idaho State University, Pocatello, ID, United States.
Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States.
Department of Geography, The University of Sheffield, Sheffield, United Kingdom.
UWA School of Agriculture and Environment, The University of Western Australia, Crawley, WA, Australia.
Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada.
School of Earth and Environment, University of Leeds, Leeds, United Kingdom.


Soils are crucial in regulating ecosystem processes, such as nutrient cycling, and supporting plant growth. To a large extent, these functions are carried out by highly diverse and dynamic soil microbiomes that are in turn governed by numerous environmental factors including weathering profile and vegetation. In this study, we investigate geophysical and vegetation effects on the microbial communities of iron-rich lateritic soils in the highly weathered landscapes of Western Australia (WA). The study site was a lateritic hillslope in southwestern Australia, where gradual erosion of the duricrust has resulted in the exposure of the different weathering zones. High-throughput amplicon sequencing of the 16S rRNA gene was used to investigate soil bacterial community diversity, composition and functioning. We predicted that shifts in the microbial community would reflect variations in certain edaphic properties associated with the different layers of the lateritic profile and vegetation cover. Our results supported this hypothesis, with electrical conductivity, pH and clay content having the strongest correlation with beta diversity, and many of the differentially abundant taxa belonging to the phyla Actinobacteria and Proteobacteria. Soil water repellence, which is associated with Eucalyptus vegetation, also affected beta diversity. This enhanced understanding of the natural system could help to improve future crop management in WA since the physicochemical properties of the agricultural soils in this region are inherited from laterites via the weathering and pedogenesis processes.


Western Australia; bacteria; critical zone; laterite; soil microbial community

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