Influence of biocurrent self-generated by indigenous microorganisms on soil quality

Area of Science:

• Soil biogeochemistry
• Microbial ecology
• Environmental science

Background:

• Redox processes and microbial extracellular electron transfer (EET) are crucial for soil biogeochemistry, linking matter and energy exchange.
• The impact of biocurrents generated by indigenous soil microorganisms on soil quality remains largely unexplored.
• Understanding EET's role is vital for soil health and element cycling.

Purpose of the Study:

• To investigate the effects of soil biocurrents on soil quality parameters.
• To explore the influence of bioelectric fields on mineral element migration.
• To assess the impact of biocurrents on soil microbial community structure and function.

Main Methods:

• Measurement of soil pH, cation exchange capacity, and nutrient availability (N, P, K).
• Quantification of sequestered organic matter changes.
• Analysis of mineral element migration and availability (Ca, Fe).
• Assessment of soil bacterial richness, diversity, and functional profiles using microbial ecology techniques.

Main Results:

• Soil biocurrents had minimal adverse effects on soil pH, CEC, and available N, P, K.
• A 29% increase in de-sequestered organic matter was observed.
• Bioelectric fields significantly influenced mineral element migration, supplementing water-salt transport theories.
• Availability of Ca and Fe increased sevenfold, highlighting EET's role in weathering and mineralization.
• Soil bacterial richness and diversity fully recovered post-biocurrent, with temporary species enrichment.

Conclusions:

• Soil biocurrents demonstrate a negligible negative impact on key soil quality indicators.
• Bioelectric fields offer a novel mechanism for element transport in soils.
• Electron transfer is a significant driver of soil weathering, mineralization, and pedogenesis.
• Soil bioelectrochemical technology is safe, as microbial communities fully recover after treatment.