Hydro-pedotransfer functions: a roadmap for future development
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Published:2024-07-29
Issue:14
Volume:28
Page:3391-3433
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Weber Tobias Karl DavidORCID, Weihermüller LutzORCID, Nemes Attila, Bechtold MichelORCID, Degré Aurore, Diamantopoulos EfstathiosORCID, Fatichi SimoneORCID, Filipović VilimORCID, Gupta SuryaORCID, Hohenbrink Tobias L.ORCID, Hirmas Daniel R., Jackisch ConradORCID, de Jong van Lier QuirijnORCID, Koestel JohnORCID, Lehmann PeterORCID, Marthews Toby R.ORCID, Minasny Budiman, Pagel HolgerORCID, van der Ploeg MartineORCID, Shojaeezadeh Shahab AldinORCID, Svane Simon Fiil, Szabó BrigittaORCID, Vereecken HarryORCID, Verhoef AnneORCID, Young MichaelORCID, Zeng YijianORCID, Zhang YonggenORCID, Bonetti SaraORCID
Abstract
Abstract. Hydro-pedotransfer functions (PTFs) relate easy-to-measure and readily available soil information to soil hydraulic properties (SHPs) for applications in a wide range of process-based and empirical models, thereby enabling the assessment of soil hydraulic effects on hydrological, biogeochemical, and ecological processes. At least more than 4 decades of research have been invested to derive such relationships. However, while models, methods, data storage capacity, and computational efficiency have advanced, there are fundamental concerns related to the scope and adequacy of current PTFs, particularly when applied to parameterise models used at the field scale and beyond. Most of the PTF development process has focused on refining and advancing the regression methods, while fundamental aspects have remained largely unconsidered. Most soil systems are not represented in PTFs, which have been built mostly for agricultural soils in temperate climates. Thus, existing PTFs largely ignore how parent material, vegetation, land use, and climate affect processes that shape SHPs. The PTFs used to parameterise the Richards–Richardson equation are mostly limited to predicting parameters of the van Genuchten–Mualem soil hydraulic functions, despite sufficient evidence demonstrating their shortcomings. Another fundamental issue relates to the diverging scales of derivation and application, whereby PTFs are derived based on laboratory measurements while often being applied at the field to regional scales. Scaling, modulation, and constraining strategies exist to alleviate some of these shortcomings in the mismatch between scales. These aspects are addressed here in a joint effort by the members of the International Soil Modelling Consortium (ISMC) Pedotransfer Functions Working Group with the aim of systematising PTF research and providing a roadmap guiding both PTF development and use. We close with a 10-point catalogue for funders and researchers to guide review processes and research.
Funder
Horizon 2020 National Natural Science Foundation of China Hrvatska Zaklada za Znanost
Publisher
Copernicus GmbH
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