Soil Organic Matter Dynamics and Hydraulic Properties

Soil organic matter (SOM) plays a central role in regulating the water, nutrient and structural regime of terrestrial ecosystems. Organic compounds derived from plant residues, root exudates and microbial by-products undergo decomposition and stabilisation processes that alter aggregate formation, pore size distribution and water-retention characteristics. Dynamic interactions between SOM and mineral surfaces influence hydraulic conductivity across saturated and unsaturated moisture ranges, affecting infiltration rates, capillary rise and plant-available water. Variations in organic matter content drive changes in field capacity, permanent wilting point and plant–microbe nutrient competition, with implications for drought resilience, carbon sequestration and sustainable land management. Advances in understanding the mechanistic links between carbon inputs, aggregate stability and water transport have underpinned the development of novel amendments and cropping practices aimed at enhancing soil health, reducing erosion and improving crop productivity under variable climatic regimes.

Research from Nature Portfolio

Recent studies have examined the synergistic roles of organic carbon and amorphous silica in preserving soil aggregate integrity during drying cycles. Results demonstrate that silica amendments enhance the tensile strength of aggregates by stabilising organic–mineral interfaces, reducing friability and maintaining pore connectivity under drought stress. This interplay between silica and SOM at the colloidal scale modulates pore density and mechanical resilience, suggesting a promising strategy for mitigating structural degradation in soils vulnerable to prolonged dry periods.

Soil Organic Matter Dynamics and Hydraulic Properties publication trend

The graph below shows the total number of articles in soil organic matter dynamics and hydraulic properties across all publications each year (not limited to Nature Index journals).

Technical terms

Soil organic matter: A mixture of plant, animal and microbial residues in various stages of decomposition that influences soil structure, nutrient availability and water retention.

Hydraulic conductivity: The ease with which water moves through soil pores under a pressure gradient, measured under saturated or unsaturated conditions.

Water retention curve: The relationship between soil water content and matric potential, defining field capacity, permanent wilting point and available water.

Aggregate stability: The resistance of soil particle clusters to disintegration under external forces such as water infiltration and drying–rewetting cycles.

Plant available water: The volumetric water content difference between field capacity and permanent wilting point that can be absorbed by plants.

References

1. Synergistic effects of organic carbon and silica in preserving structural stability of drying soils. Scientific Reports (2024).
2. Improving coarse-textured mineral soils with pulp and paper mill sludges: Functional considerations at laboratory scale. Geoderma (2023).
3. Novel carbon capture-based organo-mineral fertilisers show comparable yields and impacts on soil health to mineral fertiliser across two cereal crop field trials in Eastern England. Field Crops Research (2023).