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- W2626312912 abstract "Knowledge of the soil water retention curve (SWRC) is essential for understanding and modeling hydraulic processes in the soil. However, direct determination of the SWRC is time consuming and costly. In addition, it requires a large number of samples, due to the high spatial and temporal variability of soil hydraulic properties. An alternative is the use of models, called pedotransfer functions (PTFs), which estimate the SWRC from easy-to-measure properties. The aim of this paper was to test the accuracy of 16 point or parametric PTFs reported in the literature on different soils from the south and southeast of the State of Para, Brazil. The PTFs tested were proposed by Pidgeon (1972), Lal (1979), Aina & Periaswamy (1985), Arruda et al. (1987), Dijkerman (1988), Vereecken et al. (1989), Batjes (1996), van den Berg et al. (1997), Tomasella et al. (2000), Hodnett & Tomasella (2002), Oliveira et al. (2002), and Barros (2010). We used a database that includes soil texture (sand, silt, and clay), bulk density, soil organic carbon, soil pH, cation exchange capacity, and the SWRC. Most of the PTFs tested did not show good performance in estimating the SWRC. The parametric PTFs, however, performed better than the point PTFs in assessing the SWRC in the tested region. Among the parametric PTFs, those proposed by Tomasella et al. (2000) achieved the best accuracy in estimating the empirical parameters of the van Genuchten (1980) model, especially when tested in the top soil layer. O conhecimento da curva de retencao de agua (CRA) e essencial para compreender e modelar os processos hidraulicos no solo. No entanto, a determinacao direta do CRA consome tempo, e o custo e alto. Alem disso, e necessario grande numero de amostras, em razao da elevada variabilidade espacial e temporal das propriedades hidraulicas do solo. Uma alternativa e o uso de modelos, que sao chamados de funcoes de pedotransferencia (FPT), que estimam a CRA por meio de propriedades do solo de facil determinacao. O objetivo deste estudo foi testar a acuracia de 16 FPT, pontuais ou parametricas, existentes na literatura, em diferentes solos do sul e sudeste do Estado do Para, Brasil. As FPT testadas foram propostas por Pidgeon (1972), Lal (1979), Aina & Periaswamy (1985), Arruda et al. (1987), Dijkerman (1988), Vereecken et al. (1989), Batjes (1996), van den Berg et al. (1997), Tomasella et al. (2000), Hodnett & Tomasella (2002), Oliveira et al. (2002) e Barros (2010). Utilizou-se um banco de dados contendo textura (areia, silte e argila), densidade do solo, carbono orgânico, pH do solo, capacidade de troca cationica e CRA. A maioria das FPT testadas nao demonstrou boa acuracia para estimar as CRA. As FPT parametricas apresentaram melhor desempenho do que as FPT pontuais em estimar a CRA dos solos na regiao. Entre as FPT parametricas, as propostas por Tomasella et al. (2000) obtiveram melhor acuracia em estimar os parâmetros empiricos do modelo de van Genuchten (1980), principalmente, quando testadas na primeira camada do solo." @default.
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- W2626312912 date "2014-06-01" @default.
- W2626312912 modified "2023-09-24" @default.
- W2626312912 title "Avaliação de funções de pedotranferência para estimar curvas de retenção de água do solo na região amazônica" @default.
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