Soil Biology
Summary
Soil biology encompasses the living component of the pedosphere, from bacteria, fungi and archaea through to protozoa, nematodes, arthropods and earthworms. These organisms drive essential ecosystem processes: they decompose organic residues, cycle nutrients such as nitrogen, phosphorus and sulphur, stabilise soil organic matter and sequester carbon, regulate water infiltration and retention, and influence plant health through rhizosphere interactions. Microbial communities mediate chemical transformations by producing extracellular enzymes that break down complex polymers into available nutrients, while faunal activity fragments litter, builds soil structure and promotes aeration. Symbiotic partnerships, notably mycorrhizal fungi and nitrogen-fixing bacteria, enhance plant nutrient uptake and confer tolerance to drought or disease. Soil biodiversity underpins resilience, enabling ecosystems to adapt to disturbances and to maintain productivity. Conversely, land-use change, intensive tillage, pesticides and nutrient imbalances can suppress key taxa, disrupt food webs and impair ecosystem services. Contemporary research in soil biology seeks to understand community assembly, functional traits and their responses to climate change, to inform sustainable management of soils for agriculture, forestry and conservation.
Research from Nature Portfolio
Recent continental-scale surveys have mapped soil microbial diversity across Europe, uncovering decreases in bacterial and fungal richness in woodlands compared with grasslands and croplands, and shifts towards saprotrophic and pathogen-associated fungal guilds under intensive land use. Large-scale analyses of environmental stressors demonstrate that accumulation of multiple pressures—nutrient excess, moisture extremes, pollution—leads to significant declines in soil ecosystem services worldwide, with critical thresholds beyond which biodiversity and function collapse. Time-series modelling of soil microbial biomass carbon from 1992 to 2013 reveals a global decline of several per cent, particularly in high-latitude regions, primarily driven by warming, with implications for carbon storage and climate feedbacks.
Research from all publishers
Experimental erosion of topsoil in highly fertile Mollisols has been shown to alter the chemodiversity of dissolved organic matter (DOM) in deeper horizons, enriching lignin-like recalcitrant compounds and diminishing labile lipid and protein fractions, thereby reducing subsoil carbon sequestration potential. A process-based global assessment of dissolved organic carbon (DOC) leaching from mineral soils estimates a flux of roughly 0.28 Pg C yr⁻¹ to aquatic systems—about 15% of terrestrial net ecosystem productivity—highlighting this pathway’s significance in the global carbon cycle and its sensitivity to soil properties and climate.
Soil Biology publication trend
The graph below shows the total number of articles in soil biology across all publications each year (not limited to Nature Index journals).
Technical terms
Rhizosphere: The narrow zone of soil influenced by root exudates and inhabited by specialised microbial communities.
Extracellular enzymes: Proteins secreted by microbes to depolymerise complex organic substrates before uptake.
Priming effect: Modification of native soil organic matter decomposition following the addition of fresh organic inputs.
Symbiotic nitrogen fixation: Biological conversion of atmospheric nitrogen into ammonia by bacteria in association with plant roots.
Chemodiversity: The range and relative abundance of distinct chemical structures within a dissolved organic matter pool.
References
- Role of Soil Biology on Soil Health for Sustainable Agricultural Production.
- Patterns in soil microbial diversity across Europe. Nature Communications (2023).
- Increasing the number of stressors reduces soil ecosystem services worldwide. Nature Climate Change (2023).
- Drivers and trends of global soil microbial carbon over two decades. Nature Communications (2022).
- Simulated erosion of A horizon influences the dissolved organic matter chemodiversity and carbon sequestration of B horizon in Mollisols. Soil Biology and Biochemistry (2025).
- Leaching of dissolved organic carbon from mineral soils plays a significant role in the terrestrial carbon balance. Global Change Biology (2020).
About these summaries
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