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Ověření přesnosti stanovení vodo-stabilních půdních agregátů lesních půd u inovovaného laboratorního přístroje
Klíč, Radek
The theme of this work is to verify the accuracy of the new laboratory machine, which is used for determination of water-stable soil aggregates of forest soils. Suitable apparatus in literature is Baksajev, which is no longer produced and is not comparable apparatus in the market. For this reason, new laboratory machine was constructed based on parameters of original machine. The primary part required for design of the machine was the identification of technical and construction parameters of the older instrument, which is based on the wet sieving method used for the determination of water-stable soil aggregates. The instrument was measured, the correctness of its function was tested and the results of the soil samples were evaluated. Current state is no longer fully compliant with its design, in particular with the capacity of soil samples, as well as certain inaccuracies that occur during the sieving process. Criteria and their scale were selected, which served to evaluate correctness of old machine parts a compare it with new one. On the basis of the results obtained, first designs were made and technical drawings of individual parts of the new laboratory apparatus were created. Production of parts was realized in the company Průmyslová keramika, spol. s.r.o. The plastic box was manufactured by EKOPLAST TELČ s.r.o. The individual parts of the device were assembled together and tested the functionality of the entire machine and corrected any deficiencies. The obtained results are divided into two sections, where both devices are compared from the point of view of the technical data and from the point of view of achievement accuracy of value of the tested soil samples. The discussion describing the process of work, inaccuracies and defects that occurred during the development of the machine, as well as the possibilities of further develop of the apparatus. The innovated laboratory device, based on the results obtained by its testing fulfills the specified criteria.
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Dynamics of wood decay estaimated via acoustic tomography measurement
Klíč, Radek
The aim of the study was to determine the dynamics of wood decay using acoustic tomography. Different devices are use to estimate range of internal damage of the tree caused by wood rot as is possible to find in literature. For purpose of these measurements were used devices ArborSonic Decay Detector 3D and Resistograph IML F400-S. Thesis was divided in two main sections. The first section was focused on practical testing of both devices, acquiring knowledge about research procedure and also learning about possible mistakes to be avoid during research. It was necessary to perform two measurements at a time interval of approximately one year. In first year, 70 samples of Norway spruce (Picea abies) were measured and evaluated their health and vitality status. Trees, that had symptoms of fungi wood decay, were measured in the second year once more. Subsequently, the ranges and changes of inner damages by wood fungi were determined and compared results from both devices. The second part was focused on comparison of the graphical results of the range of decay in the Fakopp 3D software with the actual state of the affected tree trunk. An obtained result showed the dynamics of wood decay in years 2018-2019 and therefore was possible to determine the dynamics of wood decay in Norway spruce wood, verify the influence of the basic parameters and also to compare the graphical image of the decay range with the real status in the trunk. The average change of decay range of evaluated Norway spruce trees was 3,32%. It was found out, that Acoustic tomograph overestimated cavity section in 21 cases, which was 84 % in comparison with Resistograph. This overestimation fact was was also proved by graphical result from Fakopp 3D software, which was compared with real status of trunk. The use of device methods for assessment of tree status and preparation for tree care plans were more described in Discussion chapter.
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