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Monitoring dynamiky půdní vlhkosti v agroekosystému
Bednařík, Martin
The aim of my thesis was to monitor and analyse the dynamics of soil moisture (Θ) through the gravimetric method using Kopecky's physical rollers (KFV) and the capacitance method using Theta Probe ML2x (FDR) and CS616 (TDR) sensors. The measurement took place in the cadastral areas of the village Vícemelice and Polkovice. I conducted 10 parallel measurement campaigns of KFV and Theta Probe in Vícemilice and 4 in Polkovice. CS616 sensors were located stationary in both locations throughout the whole period and provided continual time series Θ. In Vícemilice, Theta Probe undervalued by 11.4 % compared to the KFV. The CS616 undervalued by 6.5 % compared to KFV and overvalued by 3.9 % Theta Probe. In Polkovice, Theta Probe undervalued by 1 % compared to KFV. The CS616 sensors systematically overvalued compared to the other two methods. It overvalued by 40.9 % compared to KFV and by 42.1 % compared to Theta Probe. Furthermore, the overvaluation was higher with a greater depth, while it was only 11 % at the top layer. Lastly, a survey of the suction pressure of soil water in relation to Θ was conducted near Vícemilice and the results of Θ measured by CS616 sensors were compared to the values simulated by SoilClim model which is one of the tools used to monitor water supplies in soil, in particular the occurrence of drought at the national level. Based on the results obtained in the framework of the submitted thesis, it can be stated that the indirect methods, in particular the Theta Probe, have proven to be useful tools for monitoring soil moisture. Compared to the destructive method, they represent significant time savings and, due to their accuracy, they can be recommended for drought monitoring, calibration of mathematical models, satellite imaging, or testing of a variety of hypotheses related to the water balance in scientific experiments.
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