Summary
This review by the International Soil Modelling Consortium's Pedotransfer Functions Working Group critically appraises four decades of research into hydro-pedotransfer functions—empirical relationships between easy-to-measure soil properties and soil hydraulic properties used in hydrological and biogeochemical models. The authors identify fundamental gaps: most PTFs are calibrated on agricultural temperate soils, ignore influences of parent material and vegetation, rely heavily on van Genuchten–Mualem formulations despite documented limitations, and exhibit significant scale mismatch between laboratory derivation and field-to-regional application. The paper provides a ten-point catalogue and strategic roadmap to guide future PTF development and use.
UK applicability
The findings are relevant to UK hydrological modelling and soil water management, as most UK PTFs also reflect the temperate agricultural bias identified. The roadmap may inform efforts to improve UK soil parameterisation for climate change impact assessments and water resources planning, though most UK soils are reasonably represented relative to global gaps.
Key measures
Evaluation of pedotransfer function methods, soil hydraulic property prediction accuracy, scale applicability, and limitations across soil types and climates
Outcomes reported
The paper systematises research on hydro-pedotransfer functions (PTFs) and identifies fundamental limitations in current approaches, including poor representation of non-agricultural soils, limited climate and land-use coverage, and scale mismatches between derivation and application. The authors provide a roadmap for improving PTF development and use across hydrological and biogeochemical modelling applications.
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