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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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Zhodnocení zdravotního stavu dřevin z hlediska výskytu dřevních hub v sídelní zeleni obce Hybrálec
Hegerová, Aneta
In this bachelor thesis, health assessment of woody plants focused on occurrence of wood-inhabiting fungi in public greenery of the Hybrálec village (Vysočina region). In total 123 trees were evaluated. The field investigation was conducted regularly from spring 2018 to autumn 2019. This research was focused on monitoring annual and perennial fruiting bodies of fungi. Ten following fungal species were recorded: Ganoderma adspersum, Hypholoma fascilucare, Kretzschmaria deusta, Laetiporus sulphureus, Pleurotus ostreatus, Phellinus igniarius, Pholiota squarrosa, Pholita adiphosa, Schizophyllum commune and Stereum hirsutum on six tree species – Acer platanoides, Aesculus hippocastanum, Fraxinus excelsior, Quercus robur, Salix alba and Tilia cordata. Selected trees were measured by an acoustic tomograph and in one case the microscopy method was used to identify the fruiting body of Ganoderma. According to the health assessment, the treatments were proposed for each of the trees to keep the best operational safety of the trees. The total price of all treatment is estimated 54,780 CZK.
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Zjištění dynamiky šíření dřevokazných hub ve kmeni
Kult, Martin
Thesis deals with detection of dynamics of wood-decaying fungi spread inside the tree trunk. Research was conducted through repeated measurements using acoustic tomograph Fakopp ArborSonic 3D and Resistograph microdrill. Through evaluation of obtained data the range and change of internal damage with rot were and comparison of the executed measurements with visual rating of the trees was made. In the end of the thesis we discuss usability of device supported methods in landscaping practice.
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Srovnání rychlosti akustického signálu s mechanickými vlastnostmi dřeva javoru
Fišer, Petr
Work is processed by comparing the propagation velocity of the acoustic signal in the maple and hornbeam. Another object of this work was to determine the dependent propagation speed of the acoustic signal in comparison with the mechanical properties of maple wood. Meaurement the speed of the acoustic signal was measured acoustic tomography Fakopp ArborSonic and 3D mechanical properties were measured in a universal testing machine ZWICK Of the 050 samples were used from one maple and hornbeam one that grew in urban environments.
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