hrvatski

High-resolution Weighing Lysimeter Measurement Implementation on a Hillslope Vineyard: First Results

In late 2020, the first weighing lysimeters in Croatia were installed at the SUPREHILL vadose zone observatory, at the top and bottom of the hillslope. The use of undisturbed weighable lysimeters is commonly used to measure water and solute fluxes at the profile scale, which can also be representative at the field scale. The lysimeters are monolithically filled, equipped with a pressure-controlled lower boundary in order to mimic field dynamics (upward and downward fluxes), and are weighable so that high-precision calculations of hydraulic fluxes (i.e. rainfall, drainage, evapotranspiration, or dew) are possible. The first glance at the 2021 data shows differences between the top and bottom of the hillslope in observed evapotranspiration, while lesser differences are observed in measured precipitation using the system. As a result of the position on the hillslope, different behavior of the soil-water potential that serves as a reference value for establishing equilibrium between the field and lysimeters is observed. Along with the first data from the observatory, the presented material includes installation methodology, system specifications, and description of the feedback control of the lower hydraulic boundary condition with its main components.

vadose zone ; precipitation ; evapotranspiration ; soil-water potential ; hillslope

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