Summary
This global meta-analysis of 2356 soil metagenomes developed an integrated soil health-microbial index to assess microbial community responses to pesticides and other anthropogenic pressures in intensive agriculture. The index was significantly lowest under severe pesticide contamination, and combined pesticide exposure with other anthropogenic and climatic factors exacerbated microbial health decline. Machine learning projections suggest that sustaining soil microbial health requires addressing pesticide management alongside broader anthropogenic impacts, as pesticide reduction strategies alone cannot prevent anticipated decline across approximately one-quarter of global farmland.
UK applicability
UK arable and mixed farming systems—which rely substantially on synthetic pesticides—would likely be affected by the identified decline trajectory. The findings support UK soil health and sustainable agriculture policies (including those outlined in the Environment Act 2021 and Agricultural Transition Plan), but suggest that pesticide reduction must be coupled with broader systemic changes to mitigate microbial health loss.
Key measures
Soil health-microbial index (composite metric: microbial diversity, nutrient cycling potential, metabolic potential, primary productivity, health risks); machine learning predictions of index decline; pesticide contamination severity; anthropogenic and climatic factor interactions
Outcomes reported
The study developed a comprehensive soil health-microbial index integrating microbial diversity, nutrient cycling potential, metabolic potential, primary productivity, and health risks. It projected that approximately 26% of global farmland could experience decline in this index between 2015 and 2040, even under sustainable development scenarios.
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