Predicting soil nonaqueous phase liquid retention with pedotransfer functions

Hernádi, Hilda and Makó, A. (2014) Predicting soil nonaqueous phase liquid retention with pedotransfer functions. Agrokémia és Talajtan, 63 (1). pp. 9-18. ISSN 0002-1873

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Abstract

The obtained results of the present study showed the good applicability of the van Genuchten equation for parameterizing NAPL retention data of soils (R² = 0.99).Sufficient applicability of continuous PTFs for estimating the parameters of NAPL retention curves was found (R² for α, n and θ_s was 0.47, 0.84 and 0.86, respectively).The accuracy of parametric and point PTFs increased in case derived values of the independent variables in addition to the PSD (particle size distribution) fractions, bulk density, CaCO₃ and organic matter content (R² = 0.57–0.90 and RMSE = 2.43–5.67 vol%) were used, as compared to PTFs using only the original values of basic soil parameters as predictor variables (R² = 0,48–0.86; RMSE = 3.56–6.83 vol%).According to the gained results, PTFs seem to be similarly accurate if the particle size distribution of soils — determined by different standard methods — are applied as independent variables.

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