干旱区生态安全与可持续发展服务平台

Improved understanding of soil water content at field capacity and estimates from pedotransfer functions

Andabili, Samira Jaefarzade ， Rasoulzadeh, Ali ， Moghadam, Javad Ramezani ， Pollacco, Joseph Alexander Paul ， Fernandez-Galvez, Jesus

2025-04-01 null null   74(卷), null(期), (null页)

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The soil water content at field capacity, theta(FC), is a fundamental variable for irrigation and agriculture. This study determines the optimal tension (-33 or -10 kPa) of deriving theta(FC) which best matches the in situ field measurements following the Veihmeyer procedure. The Veihmeyer method refers to a profile water status for which there is a negligible drainage rate of bare soil without evaporation. In addition, we derive a set of linear and nonlinear pedotransfer functions (PTFs) which estimate theta(FC). theta(FC) was measured in 69 plots in north-western Iran, which has a cold semi-arid climate. The soil properties used for developing PTFs include texture, bulk density, and organic matter. The results show that theta(FC) cannot be derived at a fixed tension. We therefore developed PTFs with satisfactory performance in reproducing in situ measured theta(FC). The findings show that PTFs developed at a fixed tension consistently underestimate theta(FC) derived in situ. It was also speculated that tension less than -10 kPa could yield improved predictions of in situ theta(FC).

关键词

aeration capacity pedotransfer functions soil physical properties soil water content soil water retention Veihmeyer drainage teneur en eau du sol r & eacute tention d'eau du sol capacit & eacute d'a & eacute ration propri & eacute t & eacute s physiques du sol fonctions de p & eacute dotransfert drainage de Veihmeyer

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