Desert Pavement Formation and Soil Development Processes

Desert pavements are widespread geomorphological features characterised by a tightly interlocking surface layer of coarse clasts that protects underlying finer sediments. These pavements form through a combination of deflation, whereby wind removes sand and silt from between stones, and the gradual settling of coarse fragments under repeated wetting, drying and thermal cycling. Concurrently, aeolian dust and fine particles infiltrate beneath the clast layer, fostering the development of a silt‐rich horizon that evolves into soil. Pedogenic processes including mineral weathering, eluviation and illuviation create distinct soil horizons, while biotic agents such as microbes and sparse vegetation influence both crust formation on clasts and organic matter accumulation in subsurface layers. Together, these physical, chemical and biological processes produce soil profiles of surprising complexity in hyperarid to semi‐arid environments. Beyond their intrinsic scientific interest, desert pavements modulate surface albedo, regulate dust emissions and act as archives of past climatic and ecological change, with implications for land management and planetary science.

Research from Nature Portfolio

Recent studies have employed novel isotopic tracers to quantify rates of dust deposition and mineral breakdown beneath pavements in one of the world’s driest regions, revealing that aeolian inputs account for the majority of silt accumulation over millennial timescales. Parallel work has shown that microscopic biofilms colonising stone surfaces act as nuclei for rock varnish formation and contribute to clast cohesion, suggesting a previously underappreciated role for microbial mediation in stabilising pavement armour. Advances in high‐resolution aerial lidar and drone photogrammetry have also enabled detailed mapping of surface roughness and clast size distributions across desert pavements in the Australian interior, uncovering systematic links between pavement thickness, subsurface porosity and local rainfall variability.

Desert Pavement Formation and Soil Development Processes publication trend

The graph below shows the total number of articles in desert pavement formation and soil development processes across all publications each year (not limited to Nature Index journals).

Technical terms

Deflation: The wind‐driven removal of fine particles from the surface, leading to concentration of coarse clasts.

Aeolian sediment: Particles transported and deposited by wind, ranging from fine dust to sand.

Stone pavement: A mosaic of closely packed coarse fragments that armour and protect underlying soils.

Pedogenesis: The suite of physical, chemical and biological processes that form and modify soils over time.

Rock varnish: A thin, dark coating of clay minerals and oxides produced by microbe‐mediated processes on exposed rock surfaces.

References

1. Role of Aeolian Dust in Shaping Landscapes and Soils of Arid and Semi-Arid South Africa. Geosciences (2018).