Soil Water Contents Control the Responses of Dissolved Nitrogen Pools and Bacterial Communities to Freeze-Thaw in Temperate Soils.

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  • Additional Information
    • Source:
      Publisher: Hindawi Pub. Co Country of Publication: United States NLM ID: 101600173 Publication Model: eCollection Cited Medium: Internet ISSN: 2314-6141 (Electronic) NLM ISO Abbreviation: Biomed Res Int Subsets: MEDLINE
    • Publication Information:
      Original Publication: New York, NY : Hindawi Pub. Co.
    • Subject Terms:
      Freezing* ; Soil Microbiology* ; Water*; Bacteria/*metabolism ; Microbial Consortia/*physiology ; Nitrogen/*metabolism
    • Abstract:
      Background: Freeze-thaw influences soil-dissolved nitrogen (N) pools due to variations in bacterial communities in temperate regions. The availability of soil water is important to soil biogeochemical cycles under frozen conditions. However, it is unclear how soil water content (SWC) mediates the effects of freeze-thaw on soil-dissolved N pools and bacterial communities.
      Method: In this study, freeze-thaw microcosms were incubated at three levels of SWC, including 10% (air-dried soils), 15% (natural SWC), and 30% (wet soils). In addition to measuring soil-dissolved N pools, variations in bacterial communities were examined using high-throughput sequencing. Results and Conclusions . Total dissolved N (TDN), NO 3 - -N, NH 4 + -N, microbial biomass N (MBN), and net N mineralization rate (NNMR) were significantly influenced by SWC, freeze-thaw, and their interaction (NH 4 + -N excluded). N immobilization was inhibited under both low and high SWC, which was accompanied by varied bacterial community composition. However, only higher SWC substantially modified the freeze-thaw effects on the soil-dissolved N pools, characterized by a decrease in N mineralization (especially for the content of NO 3 - -N and NNMR) and an increase in N immobilization (MBN). These scenarios could be significantly correlated to variations in bacterial community composition based on redundancy analysis, especially by species belonging to Bacteroidetes , Nitrospirae , Alphaproteobacteria , Gemmatimonadetes , and Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC. Bacteroidetes , Nitrospirae , Alphaproteobacteria , Gemmatimonadetes , and Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC. Nitrospirae , Alphaproteobacteria , Gemmatimonadetes , and Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC. Alphaproteobacteria , Gemmatimonadetes , and Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC. Gemmatimonadetes , and Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC. Verrucomicrobia (Spearman's correlations). In conclusion, bacterial species passed through biotic (bacterial species) and abiotic filters (soil N pools) in response to freeze-thaw under varied SWC.
      Competing Interests: The authors have no conflicts of interest to declare.
      (Copyright © 2020 Nan Jiang et al.)
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    • Accession Number:
      059QF0KO0R (Water)
      N762921K75 (Nitrogen)
    • Publication Date:
      Date Created: 20200408 Date Completed: 20201216 Latest Revision: 20220413
    • Publication Date:
      20240105
    • Accession Number:
      PMC7086428
    • Accession Number:
      10.1155/2020/6867081
    • Accession Number:
      32258137