Assessing microbial community patterns under incipient soil formation from basalt
Abstract
Microbial dynamics drive the biotic machinery of early soil evolution. However, integrated knowledge of microbial community establishment, functional associations, and community assembly processes in incipient soil is lacking. This study presents a novel approach of combining microbial phylogenetic profiling, functional predictions, and community assembly processes to analyze drivers of microbial community establishment in an emerging soil system. Rigorous sub-meter sampling of a basalt-soil lysimeter after two years of irrigation revealed the contrasting depth-dependent distribution patterns of soil parameters and community diversity. Phylogenetic analysis of 16S rRNA gene indicated the presence of diverse bacterial and archaeal phyla, with high relative abundance of Actinobacteria on the surface and a consistently high abundance of Proteobacteria at all depths. Predicted functional gene analysis suggested dominant autotrophy signatures, evidence of an incomplete nitrogen cycle, and predicted enzymes of iron (III) to iron (II) conversion followed by intracellular uptake, transport, and regulation. Null modeling revealed microbial community assembly predominantly governed by variable selection. The relative influence of the variable selection decreased with depth, indicating unique and relatively harsh environmental conditions near the surface and more benign conditions with depth. Additionally, high levels of dispersal influenced community composition near the center of the domain, suggesting that spatialmore »
- Authors:
-
[1];
[2];
- UNIVERSITY OF ARIZONA
- BATTELLE (PACIFIC NW LAB)
- University of Arizona
- University of Alaska Anchorage
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1543313
- Report Number(s):
- PNNL-SA-127573
- DOE Contract Number:
- AC05-76RL01830
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Geophysical Research. Biogeosciences
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 4
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Sengupta, Aditi, Stegen, James C., Neto, Antonio, Wang, Yadi, Neilson, Julia W., Tatarin, Triffon, Hunt, Edward A., Dontsova, Katerina, Chorover, Jon D., Troch, Peter, and Maier, Raina M. Assessing microbial community patterns under incipient soil formation from basalt. United States: N. p., 2019.
Web. doi:10.1029/2017JG004315.
Sengupta, Aditi, Stegen, James C., Neto, Antonio, Wang, Yadi, Neilson, Julia W., Tatarin, Triffon, Hunt, Edward A., Dontsova, Katerina, Chorover, Jon D., Troch, Peter, & Maier, Raina M. Assessing microbial community patterns under incipient soil formation from basalt. United States. https://doi.org/10.1029/2017JG004315
Sengupta, Aditi, Stegen, James C., Neto, Antonio, Wang, Yadi, Neilson, Julia W., Tatarin, Triffon, Hunt, Edward A., Dontsova, Katerina, Chorover, Jon D., Troch, Peter, and Maier, Raina M. Fri .
"Assessing microbial community patterns under incipient soil formation from basalt". United States. https://doi.org/10.1029/2017JG004315.
@article{osti_1543313,
title = {Assessing microbial community patterns under incipient soil formation from basalt},
author = {Sengupta, Aditi and Stegen, James C. and Neto, Antonio and Wang, Yadi and Neilson, Julia W. and Tatarin, Triffon and Hunt, Edward A. and Dontsova, Katerina and Chorover, Jon D. and Troch, Peter and Maier, Raina M.},
abstractNote = {Microbial dynamics drive the biotic machinery of early soil evolution. However, integrated knowledge of microbial community establishment, functional associations, and community assembly processes in incipient soil is lacking. This study presents a novel approach of combining microbial phylogenetic profiling, functional predictions, and community assembly processes to analyze drivers of microbial community establishment in an emerging soil system. Rigorous sub-meter sampling of a basalt-soil lysimeter after two years of irrigation revealed the contrasting depth-dependent distribution patterns of soil parameters and community diversity. Phylogenetic analysis of 16S rRNA gene indicated the presence of diverse bacterial and archaeal phyla, with high relative abundance of Actinobacteria on the surface and a consistently high abundance of Proteobacteria at all depths. Predicted functional gene analysis suggested dominant autotrophy signatures, evidence of an incomplete nitrogen cycle, and predicted enzymes of iron (III) to iron (II) conversion followed by intracellular uptake, transport, and regulation. Null modeling revealed microbial community assembly predominantly governed by variable selection. The relative influence of the variable selection decreased with depth, indicating unique and relatively harsh environmental conditions near the surface and more benign conditions with depth. Additionally, high levels of dispersal influenced community composition near the center of the domain, suggesting that spatial processes interact with deterministic selection imposed by the environment. Characterizing the complexity in incipient soils can advance research insights about microbial community diversity and assembly in other incipient systems (e.g., transformation of marginal soils, or soils recovering from disturbances such as fire, erosion, intensive agricultural practices, or contamination).},
doi = {10.1029/2017JG004315},
url = {https://www.osti.gov/biblio/1543313},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 4,
volume = 124,
place = {United States},
year = {2019},
month = {4}
}
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