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Soil Microbial Community and Its Interaction with Soil Carbon Dynamics Following a Wetland Drying Process in Mu Us Sandy Land

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  • Huan He

    (College of Science, Northwest Agricultural and Forestry University, Yangling 712100, China)

  • Yixuan Liu

    (College of Natural Resources and Environment, Northwest Agricultural and Forestry University, Yangling 712100, China)

  • Yue Hu

    (College of Natural Resources and Environment, Northwest Agricultural and Forestry University, Yangling 712100, China)

  • Mengqi Zhang

    (College of Natural Resources and Environment, Northwest Agricultural and Forestry University, Yangling 712100, China)

  • Guodong Wang

    (College of Science, Northwest Agricultural and Forestry University, Yangling 712100, China)

  • Weibo Shen

    (College of Natural Resources and Environment, Northwest Agricultural and Forestry University, Yangling 712100, China)

Abstract

Increasing drought globally is a severe threat to fragile desert wetland ecosystem. It is of significance to study the effects of wetland drying on microbial regulation of soil carbon (C) in the desert. In this study, we examined the impacts of wetland drying on microbial biomass, microbial community (bacteria, fungi) and microbial activity [basal microbial respiration, microbial metabolic quotient (qCO 2 )]. Relationships of microbial properties with biotic factors [litter, soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP)], abiotic factors (soil moisture, pH and clay content) and biological processes (basal microbial respiration, qCO 2 ) were also developed. Results showed that the drying of wetland led to a decrease of soil microbial biomass carbon (MBC) content, microbial biomass nitrogen (MBN) content and fungi and bacterial abundance, and an increase of the fungi:bacteria ratio. Wetland drying also led to increased soil basal respiration and increased qCO 2 , which was attributed to lower soil clay content and litter N concentration. The MBC:SOC ratios were higher under drier soil conditions than under virgin wetland, which was attributed to stronger C conserve ability of fungi than bacteria. The wetland drying process exacerbated soil C loss by strengthening heterotrophic respiration; however, the exact effects of soil microbial community structure on microbial C mineralization were not clear in this study and need further research.

Suggested Citation

  • Huan He & Yixuan Liu & Yue Hu & Mengqi Zhang & Guodong Wang & Weibo Shen, 2020. "Soil Microbial Community and Its Interaction with Soil Carbon Dynamics Following a Wetland Drying Process in Mu Us Sandy Land," IJERPH, MDPI, vol. 17(12), pages 1-19, June.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:12:p:4199-:d:370644
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    References listed on IDEAS

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    2. Aiguo Dai, 2013. "Increasing drought under global warming in observations and models," Nature Climate Change, Nature, vol. 3(1), pages 52-58, January.
    3. Aiguo Dai, 2013. "Erratum: Increasing drought under global warming in observations and models," Nature Climate Change, Nature, vol. 3(2), pages 171-171, February.
    4. Manuel Delgado-Baquerizo & Fernando T. Maestre & Antonio Gallardo & Matthew A. Bowker & Matthew D. Wallenstein & Jose Luis Quero & Victoria Ochoa & Beatriz Gozalo & Miguel García-Gómez & Santiago Soli, 2013. "Decoupling of soil nutrient cycles as a function of aridity in global drylands," Nature, Nature, vol. 502(7473), pages 672-676, October.
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