Sampling Strategies for Hydrological Properties and Chemical Constituents in theUpper Vadose Zone

摘要

The main objective was to compare optimum interpolation schemes for determiningtransport parameters and chemical constituents of the upper vadose zone. Also to be considered was transferability of parameters from one setting to another. In addition to theoretical investigations, an extensive set of field data was collected which demanded a major part of the total effort. The primary field location was at the Maricopa Agricultural Center operated by the University of Arizona near Maricopa, Arizona. A total of 196 sampling points were used with 150 on an approximately 15 x 10 grid with a 100 m spacing. Properties which were evaluated for the surface at all of the sites were pH, EC, Cl, NO3, SO4, Ca, Mg, Na, gravel, sand, silt, clay and water retained at 1/3, 1 and 15 bars.