Effects of biochar and compost on the abundant and rare microbial communities assembly and multifunctionality in pesticide-contaminated soil under freeze‒thaw cycles

Guoxin Shi ¹, Heng Li ², Qiang Fu ²

⁰School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China; Key Laboratory of Effective Utilization of Agricultural Water Resources of Ministry of Agriculture, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China; Heilongjiang Provincial Key Laboratory of Water Resources and Water Conservancy Engineering in Cold Region, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China; College of Agriculture, Northeast Agricultural University, Harbin, Heilongjiang, 150030, China.

Environmental Pollution (Barking, Essex : 1987) +

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September 22, 2024

View abstract on PubMed

Summary

Biochar and compost treatments effectively reduce pesticide pollution in freeze-thaw soils. These amendments enhance soil microbial communities and improve soil multifunctionality, offering solutions for agricultural soil remediation.

Area Of Science

Soil Science
Environmental Microbiology
Agrochemistry

Background

Soil contamination by pesticides like glyphosate, imidacloprid, and pyraclostrobin poses environmental risks.
Freeze-thaw cycles impact soil microbial communities and their functions.
The effects of soil amendments on microbial communities in contaminated, freeze-thaw soils require further investigation.

Purpose Of The Study

To investigate the impact of biochar, compost, and their combination on abundant and rare microbial communities in pesticide-contaminated soil under freeze-thaw cycles.
To assess the effects of these amendments on soil multifunctionality.
To understand the influence on pesticide degradation and microbial community assembly.

Main Methods

Application of biochar, compost, and a combined treatment to glyphosate, imidacloprid, and pyraclostrobin contaminated soil.
Exposure to freeze-thaw cycles.
Analysis of microbial community structure, function, and soil multifunctionality.
Assessment of pesticide concentration and half-life.

Main Results

Freeze-thaw cycles enhanced biochar and compost properties, improving pesticide adsorption.
Biochar and compost treatments reduced pesticide concentrations and half-lives, enhancing degradation by rare microbial taxa.
Amendments improved the structure and co-occurrence of abundant and rare microbial taxa.
Combined treatment shifted microbial assembly from dispersal limitation to homogenizing dispersal and selection, boosting soil multifunctionality.

Conclusions

Biochar and compost are effective in remediating pesticide-contaminated soils in seasonal frozen regions.
The combined treatment significantly enhances soil multifunctionality by influencing rare microbial taxa and assembly processes.
Findings offer insights into soil functional cycles involving microbial communities in cold environments.

Keywords:

Abundant and rare taxa Adsorption capacity Degradation Multifunctionality

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