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The different responses of AOA and AOB communities to irrigation systems in the semi-arid region of Northeast China

  • 0Key Laboratory of Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, College of Resource and Environmental Science, Jilin Agricultural University, Changchun, China.
Frontiers in Microbiology +

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May 22, 2024

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May 22, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Drip irrigation methods (DI and MF) significantly enhance soil nitrogen and moisture, boosting ammonia-oxidizing microorganisms (AOM) crucial for the nitrogen cycle in semi-arid regions. These irrigation strategies support soil health and microbial propagation.

Area Of Science

  • Soil microbiology
  • Environmental science
  • Agricultural science

Background

  • Ammonia oxidation, a critical step in nitrification and the nitrogen cycle, is sensitive to soil conditions.
  • Understanding the impact of irrigation on soil microenvironments is vital for soil fertility and crop production.
  • Ammonia-oxidizing microorganisms (AOM), including archaea (AOA) and bacteria (AOB), play a key role in soil nitrogen transformation.

Purpose Of The Study

  • To investigate the influence of different irrigation systems on the abundance, diversity, and community composition of soil AOA and AOB.
  • To determine the relationship between soil physicochemical factors, enzyme activities, and AOM responses under various irrigation regimes.
  • To evaluate the suitability of different irrigation systems for promoting soil health and microbial activity in semi-arid regions.

Main Methods

  • Studied the abundance and community diversity of AOA and AOB using the amoA gene.
  • Analyzed soil physicochemical factors (e.g., alkaline hydrolyzed nitrogen, nitrate nitrogen, soil moisture).
  • Assessed enzyme activities, including ammonia monooxygenase (AMO) and hydroxylamine oxidase (HAO).
  • Employed three irrigation systems: flood irrigation (FP), shallow buried drip irrigation (DI), and mulched drip irrigation (MF).

Main Results

  • DI and MF significantly increased soil moisture, alkaline hydrolyzed nitrogen, and nitrate nitrogen compared to FP.
  • DI and MF enhanced the activities of AMO and HAO.
  • DI increased the abundance of both AOA and AOB, while MF primarily increased AOB abundance.
  • Irrigation systems significantly altered AOM community composition, with AN and soil moisture being key influencing factors.
  • AOB communities exhibited greater stability and complexity than AOA communities under different irrigation systems.

Conclusions

  • Shallow buried drip irrigation (DI) and mulched drip irrigation (MF) are more effective than flood irrigation in promoting soil AOM propagation in semi-arid Northeast China.
  • DI and MF improve soil nutrient status and enzyme activities, contributing to a healthier soil microbial environment.
  • These findings provide a microbiological basis for optimizing irrigation and nitrogen management in agricultural soils.

Keywords:

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