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Influence of fluctuating temperature on soil microflora.

J Kubát, M Králová, B Novák

    Zentralblatt Fur Bakteriologie, Parasitenkunde, Infektionskrankheiten Und Hygiene. Zweite Naturwissenschaftliche Abteilung: Mikrobiologie Der Landwirtschaft Der Technologie Und Des Umweltschutzes
    |January 1, 1979
    PubMed
    Summary

    Soil microbial growth thrives at lower temperatures, with fluctuating temperatures enhancing microbial counts and nitrogen transformation. Fluctuations also led to a decrease in nitrates compared to constant temperatures.

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    Area of Science:

    • Soil Microbiology
    • Environmental Science
    • Microbial Ecology

    Background:

    • Soil microflora plays a crucial role in nutrient cycling and ecosystem health.
    • Temperature is a key environmental factor influencing microbial activity and growth.
    • Understanding microbial responses to temperature fluctuations is vital for predicting soil ecosystem dynamics.

    Purpose of the Study:

    • To investigate the impact of constant versus fluctuating temperatures on soil microorganisms.
    • To compare microbial growth, nitrogen transformation, and nitrate levels under different thermal regimes.
    • To determine the influence of fluctuation direction (low-to-high vs. high-to-low) on soil microbial dynamics.

    Main Methods:

    • Laboratory experiments were conducted to expose soil samples to controlled temperature conditions.

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  • Constant temperatures and square-wave fluctuating temperatures were applied.
  • Microbial counts, nitrogen transformation rates, and nitrate concentrations were monitored over five days of incubation.

    • Main Results:

    • Soil microorganism growth was higher at lower temperatures, suggesting better substrate immobilization and energy efficiency.
    • Microbial counts were slightly elevated after five days of incubation under fluctuating temperatures compared to constant mean temperatures.
    • Fluctuating temperatures resulted in decreased nitrate levels compared to constant temperatures.
    • Temperature fluctuations accelerated the development dynamics of soil microorganisms, as evidenced by nitrogen transformation and microbial count changes.

    Conclusions:

    • Fluctuating temperatures can enhance soil microbial activity and nitrogen cycling compared to constant temperatures.
    • The direction of temperature fluctuation may influence microbial responses.
    • Soil microbial communities exhibit distinct responses to thermal variability, impacting soil functions like nutrient availability.