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Characterizing changes in soil microbiome abundance and diversity due to different cover crop techniques

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  • Charlotte H Wang
  • Linda Wu
  • Zengyan Wang
  • Magdy S Alabady
  • Daniel Parson
  • Zainab Molumo
  • Sarah C Fankhauser

Abstract

Soil-based microorganisms assume a direct and crucial role in the promotion of soil health, quality and fertility, all factors known to contribute heavily to the quality and yield of agricultural products. Cover cropping, used in both traditional and organic farming, is a particularly efficient and environmentally favorable tool for manipulating microbiome composition in agricultural soils and has had clear benefits for soil quality and crop output. Several long-term investigations have evaluated the influence of multi-mix (multiple species) cover crop treatments on soil health and microbial diversity. The present study investigated the short-term effects of a seven species multi-mix cover crop treatment on soil nutrient content and microbial diversity, compared to a single-mix cover crop treatment and control. Analysis of 16S sequencing data of isolated soil DNA revealed that the single-mix cover crop treatment decreased overall microbial abundance and diversity, whereas the control and multi-mix treatments altered the overall microbial composition in similar fluctuating trends. Furthermore, we observed significant changes in specific bacteria belonging to the phyla Acidobacteria, Actinobacteria, Planctomycetes, Proteobacteria and Verrucombicrobia for all treatments, but only the single-mix significantly decreased in abundance of the selected bacteria over time. Our findings indicate that the control and multi-mix treatments are better at maintaining overall microbial composition and diversity compared to the single-mix. Further study is required to elucidate the specific difference between the treatment effect of the multi-mix treatment and the control, given that their microbial composition changes over time were similar but they diverge into two populations of unique bacterial types by the end of this short-term study.

Suggested Citation

  • Charlotte H Wang & Linda Wu & Zengyan Wang & Magdy S Alabady & Daniel Parson & Zainab Molumo & Sarah C Fankhauser, 2020. "Characterizing changes in soil microbiome abundance and diversity due to different cover crop techniques," PLOS ONE, Public Library of Science, vol. 15(5), pages 1-22, May.
    • Handle: RePEc:plo:pone00:0232453
    DOI: 10.1371/journal.pone.0232453
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    1. L. E. Drinkwater & P. Wagoner & M. Sarrantonio, 1998. "Legume-based cropping systems have reduced carbon and nitrogen losses," Nature, Nature, vol. 396(6708), pages 262-265, November.
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