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[Ecological effect of pendimethalin on soil microbe].

Lusheng Zhu1, Jun Wang, Aijun Lin

  • 1College of Resources & Environment, Shandong Agricultural University, Taian 271018, China. lszhu@sdau.edu.cn

Huan Jing Ke Xue= Huanjing Kexue
|July 31, 2002
PubMed
Summary

This study investigated the impact of the herbicide pendimethalin on soil microbial activity. Results indicate pendimethalin stimulates cellulose degradation and dehydrogenase activity, while initially inhibiting then stimulating soil urease activity.

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Area of Science:

  • Soil Science
  • Environmental Chemistry
  • Microbiology

Background:

  • Herbicides are widely used in agriculture, potentially impacting soil ecosystems.
  • Understanding the effects of herbicides like pendimethalin on soil microbial processes is crucial for sustainable land management.

Purpose of the Study:

  • To evaluate the impact of varying concentrations of pendimethalin on key soil microbial activities.
  • To assess the influence of pendimethalin on carbon dioxide emission, cellulose degradation, dehydrogenase activity, and urease activity in soil.

Main Methods:

  • Soil samples were treated with different concentrations of pendimethalin (1, 5, and 10 µg/g).
  • Measurements included CO2 emission, cellulose degradation rates (half-life), dehydrogenase activity, and urease activity.

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  • Control (CK) samples were used for comparison.

    • Main Results:

    • Pendimethalin did not significantly alter CO2 emission compared to the control.
    • Pendimethalin significantly stimulated cellulose degradation, with longer half-lives observed at higher concentrations.
    • Dehydrogenase activity was activated, with effects increasing in magnitude and duration with higher pendimethalin concentrations.
    • Soil urease activity showed an initial inhibition followed by stimulation, both concentration- and time-dependent.

    Conclusions:

    • Pendimethalin exhibits a complex influence on soil microbial activity, stimulating some processes like cellulose and dehydrogenase activity.
    • While CO2 emission was unaffected, pendimethalin's effects on urease activity suggest a biphasic response.
    • These findings highlight the need for careful consideration of herbicide impacts on soil health and function.