Earthworm Ecology and Soil Functionality

Earthworms are pivotal ecosystem engineers that shape soil architecture, nutrient turnover and carbon dynamics across terrestrial ecosystems. Through bioturbation, they create extensive burrow networks that enhance porosity, water infiltration and aeration, thus regulating soil hydrology and mitigating erosion. Their feeding and excretion processes accelerate decomposition of organic residues and stimulate microbial activity within the drilosphere, forming hotspots of biogeochemical cycling. By fragmenting plant litter and promoting aggregation, earthworms contribute to the formation of both particulate and mineral-associated organic matter, with implications for soil structure stability and long-term carbon sequestration. Variations among ecological groups reflect divergent functional roles: epigeic species process surface litter, endogeic species churn mineral soils, and anecic species construct vertical burrows that link surface and subsurface layers. These interactions underpin a spectrum of ecosystem services, from increased crop productivity to climate regulation. Contemporary research emphasises the global significance of earthworm diversity in sustaining soil resilience under land-use change and climatic extremes, and highlights practical applications in regenerative agriculture, habitat restoration and carbon management strategies.

Research from Nature Portfolio

Recent studies have refined mechanistic understanding of how soil fauna govern organic matter pools. One investigation proposes three key pathways—transformation, microbial grazing and translocation—by which earthworms modulate formation and stability of particulate and mineral-associated organic matter, urging integrated isotope, fractionation and microbiological approaches. Another report demonstrates that earthworms act as in situ biochemical reactors, converting labile plant compounds into microbial necromass within stabilised carbon fractions without altering total carbon stocks, thereby enhancing resilience of soil carbon to disturbance and emphasising the role of particulate organic matter in sequestration.

Earthworm Ecology and Soil Functionality publication trend

The graph below shows the total number of articles in earthworm ecology and soil functionality across all publications each year (not limited to Nature Index journals).

Technical terms

Bioturbation: Physical mixing of soil layers by organisms, especially through burrowing and casting.

Drilosphere: The zone of soil influenced by earthworm activity, including burrow linings and casts, supporting enhanced microbial processes.

Particulate organic matter (POM): Coarse organic fragments derived from plant litter or faunal residues that form a key labile carbon pool.

Mineral-associated organic matter (MAOM): Organic compounds stabilised through sorption to mineral surfaces, contributing to long-term carbon storage.

Microbial necromass: Dead microbial biomass that becomes a stable component of soil organic matter following faunal and microbial decomposition.

References

1. Conceptualizing soil fauna effects on labile and stabilized soil organic matter. Nature Communications (2024).
2. Earthworms act as biochemical reactors to convert labile plant compounds into stabilized soil microbial necromass. Communications Biology (2019).
3. Amazonian earthworm biodiversity is heavily impacted by ancient and recent human disturbance. The Science of The Total Environment (2023).
4. Impact of different earthworm ecotypes on water stable aggregates and soil water holding capacity. Biology and Fertility of Soils (2020).
5. Soil chemistry turned upside down: a meta‐analysis of invasive earthworm effects on soil chemical properties. Ecology (2020).