soil moisture retention curve (smrc) is an important soil property which expresses reaction between matric potential and moisture of soil. direct measurement of soil matric potential and moisture is labour- and time-consuming. in order to prevail this problem, indirect methods are used for smrc prediction. pedotransfer functions (ptfs) are one of these indirect methods. this study was carried o...

Modeling of the land surface water-, energy-, and carbon balance provides insight into behavior Earth System, under current future conditions. Currently, there exists a substantial variability between model outputs, for range types, whereby differences input parameters could be an important reason. For large-scale surface, hydrological, crop models, soil hydraulic properties (SHP) are required ...

Ranges or “classes” of probable saturated hydraulic conductivity values (Ksat) are listed for all soil series in USDA-NRCS Soil Survey reports. Listed not measured, but rather estimated from other properties using a pedotransfer function (PTF). To validate the PTF, we compared Ksat classes with measured various horizons nine major Puerto Rico. For each horizon, minimum 9 and usually 16 measurem...

We present a new method of characterizing the void structures of soils from water retention curves as the primary source of data. The method avoids the problems of other current approaches, which use smoothing curves and can miss the subtleties of soil structure, and usually ignore the shielding of large pores by the small connecting throats surrounding them. In the new method, software we have...

An improved particle swarm optimization (IPSO) was proposed and the intelligent algorithms such as IPSO, genetic algorithm (GA), and simulated annealing algorithm (SA) were introduced to determine parameters of Van Genuchten (VG) model for soil water retention curve (SWRC) of four typical agricultural soil textures (clay, clay loam, silt loam and sand loam) in China. For comparison, the SWRC in...

Hydrological, ecohydrological, and terrestrial biosphere models depend on pedotransfer functions for computing soil hydraulic parameters based easily measurable variables, such as textural physical properties. Several have been derived in the last few decades, providing divergent estimates of parameters. In this study, we quantify how uncertainties embedded using different propagate to ecosyste...