National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Health condition of trees in the arboretum Bukovina
Hochová, Lenka ; Čížková, Dana (advisor) ; Šrůtka, Petr (referee)
Diploma thesis Health condition of trees in the arboretum Bukovina explains the damage of trees, tree diseases, impacts of deseases in its theoretical part. It also includes a brief summary of biotic and abiotic factors that cause damage. The Manionova stress theory, which clearly indicates the gradual effect of stressors on the species, is described. The second chapter is focused on the ways how is the health condition of trees assessed. The typical rating scale is also mentioned. The methodics is focused on finding damage of trees or other anomalies with subsequent determination of the method of damage in the area of the arboretum. Location arboretum in the area Hruboskalsko rock town gives the possibility to find such damages that are typical for dense, mature stands. The first trees were planted in arboretum in 1860, so it is expected that on this old trees many diseases are evident. I focused on introduced tree species that are typical for this arboretum, it is also mentioned visible damage of native woods. The result of the work is to evaluate the status of selected species and the end of the thesis show the table with the detected results. At the end of the discussion the results are confronted and some recommendations are proposed.
Analysis of selected factors affecting occurrence of Chalara fraxinea in the environment.
Havrdová, Ludmila ; Šrůtka, Petr (advisor) ; Jaroslava, Jaroslava (referee)
Extensive investigation of ash dieback impact on different rural vegetation types (solitaires, scattered plantations, riparian stands, scree- and ash-alder alluvial forests) was performed in the Lusatian Mts. (the Czech Republic) between 2011 and 2013. The rate of ash dieback and 27 environmental variables were investigated in 80 research plots with a total of 1045 evaluated trees. The developed model (GLM) explained ca 27% of the disease variability. Particular models for each vegetation type importantly differed from each other and explained 28--46% of the disease variability. The variables that positively affected the disease impact included the host crown area, ash area and rate of ash in the stands, tree layer area, canopy closure, north aspect, shrub and herbaceous layer canopy, vertical heterogeneity and standard deviation of TPI. Tree height, the distance and damage of the nearest host as well as the water source distance, slope and its standard deviation affected it negatively. The coincidental attack of the trees by Armillaria sp. and Hylesinus fraxini positively affected the disease progress, whereas the presence of Nectria sp. and Aceria fraxinivorus conclusively decreased progress, most likely via the induction of secondary metabolites. The highly conclusive regression of ash dieback on the number of days with an air humidity of >95% between 6--11 a.m. in the main period of ascospore spread was identified. Because the air humidity near the ground was highly affected by local factors, a GLM model explaining the variability of air humidity with that of investigated factors was developed. This model explained 77% of the variability attributed to air humidity, local factors (TPI and SD of TPI, aspect, slope, altitude, distance from open water, tree and shrub layers canopy, tree stand height, etc.) greatly affected the disease impact related to air humidity. The landscape form was identified as a factor (most likely via air humidity) that affects the impact of the disease -- for example, the stands on mountain tops and slopes were less affected than the stands in valleys. The vegetation types highly differed in the disease extent. In general, the solitaires and scree forests were significantly less damaged than mixed ash-alder forests and riparian stands. The smaller stands were less affected than the more extended, the stands enclosed in canopy of other forests were less damaged than comparable vegetation in open landscapes and stands with higher humidity (riparian stands and mixed ash-alder forests) were more damaged than those without water. The outcome clearly supports the possibility of development and usefulness of appropriate forest and landscape management of the disease.
Actual state in the 2015 year of the Nun Moth (Lymantria monacha) in the Brdy region
Vondřich, Vladimír ; Šrůtka, Petr (advisor) ; Nakládal, Oto (referee)
This thesis aims to analyze actual state of the nun moth (Lymantria monacha L.) in the Brdy region in the year 2015. The main objective was to determine its population density. For the research several sites were selected in which three monitoring methods were used: adhesive tree bands, dropping method and pheromone-baited traps. The results revealed that the nun moth only occurs in the forest in minimal numbers. Another objective was to evaluate colour forms of moths and determine connection between colour forms of caterpillars and moths. For the lack of captured caterpillars no results were acquired. The majority of moths caught on pheromone-baited traps had gray colouring and relatively small number of moths (21%) had basic (white) colouring.
Most important pathogenic fungi in The National Park Bohemian Switzerland
Tiler, Michal ; Pešková, Vítězslava (advisor) ; Šrůtka, Petr (referee)
Abstract This diploma thesis evaluates about the current state of health of forests in the National Park Czech Switzerland. The aim was explored the most pathogenic fungi found in the national park and was determined their distribution, meaning a major threat for trees of the area. The first part describes about the fungal pathogen found in the national park. And presents their description, biology, symptoms of damage and, ultimately, their seriousness and protection. Second part describes the most important trees of the field. In the National Park are the most important spruce, Scots pine, silver fir and hardwoods are mainly beech. The third part describes a self-monitoring and survey identified fungal pathogens based on field research. Important pathogens are from genus Armillaria, types Lophodermium pinastri , Lophodermium seditiosum, Lophodermium piceae, Meloderma desmazieria and Hymenoscyphus fraxineus. The final section assesses the condition of health of trees. For that assessment was used defoliation. The assessment was performed in stands of spruce, ash and fir. There were assessed 348 specimens with average defoliation of spruce 43.5%, 194 specimens with average ash defoliation 51.2% and for fir´s 71 specimens was average 52.7% defoliation. Work submitted actual, comprehensive overview about the state of health of forests in the National Park Czech Switzerland in terms of possible danger from fungal pathogens. No fungal species are found currently significantly jeopardizes the health status of assessed trees.
The incidence of biotic and abiotic damages of forest trees in the LHC Chřibská.
Friml, Vít ; Čížková, Dana (advisor) ; Šrůtka, Petr (referee)
The goal of the thesis Occurrence of biotic and abiotic damages to forest trees in FMU Chřibská (Forest Management Unit Chřibská) is survey of aforementioned damages within forest properties owned by city of Chřibská in Northern Bohemia. The thesis includes list of damages from years 2007 - 2016 and performs study of possible causes of some of those damages.
Problems with pathogenic fungi in the park Stromovka
Kubištová, Pavla ; Čížková, Dana (advisor) ; Šrůtka, Petr (referee)
The thesis describes characteristics of the study area, Královská obora, where the investigation was carried out in the field. It also engages in the description of the studied trees, wood-decaying fungi and damage of trees that occurs and causes problems here, in Stromovka, especially in the most visited areas of the park. Various injuries are a common cause of infection of pathogenic fungi that threatens a stability of trees and hence a safety of the park visitors. Health assessment conducted in location in the park Stromovka, which are problematic due to the occurrence of wood-decaying fungi. The locations were placed at the Planetarium, for the track and along the track. It was focused on the occurrence Meripilus giganteus on beeches, whom they are in the park problems with, particularly on heavily visited sites. 663 trees were inspected in total. The statistical analysis showed that most of the damages of trees in the park Stromovka was dry branches (12 % of the total trees ), probably it was as a result of above-average temperatures in 2015. Only 3 % of the total number of inspected trees were infected by wood decaying fungi. Most of the trees were infected by Inonotus cuticularis (23 % of the total number of found wood-destroying fungi). Meripilus giganteus caused 14 % of the total number of found wood-destroying fungi dameges on the trees in the area. The infestation by pathogenic fungi was not significant on the inspected trees, it could be caused by above average temperatures and below-average rainfall in 2015. At the same time their presence was influent by a felling of trees in studied area from November 2014 to the end of March 2015. It was decided on the basis of dendrological research, that the identified riskiest trees infested by fungi and dying trees with disrupted stabilitye.
The use of olfactory capabilities of a dog to search for bark beetle affected trees in context to preventive protection of forests
Drmla, Jakub ; Šrůtka, Petr (advisor) ; Naděžda, Naděžda (referee)
Exceptional ability to smell dog in human activity are used for several centuries. The dog is trained for tracking , searching for drugs , weapons, ammunition , human remains , tobacco and money . Usability dog is recorded in the health sector , where the dog can identify the smell serious illness. Deploying a dog to search for forest pests , especially bark beetle was experimentally tested in several European countries , but they were always used the associated odors from the environment beetle . The aim of this thesis was to design and test the methodology in practice dog is trained to search the bark in the forest and to develop and test methodology for deploying the dog directly in the forest , provided that the dog will only identify the smell of bark Beatles. The training methodology and deployment methodology dog in practice aimed to demonstrate the dog's ability to identify the presence of bark beetle in the forest and bring cost-effective form of prevention inspections forest cover within the meaning of applicable legislation. The long-term verification specially trained dog was clearly proved that the dog is very well and quickly able to identify the bark in the forest , which is most at risk. At the same time training the dog to find the bark creating an efficient instrument for the implementation of preventive examinations of forests against bark beetle infestation in accordance with applicable legislation
Packet Filtering in Computer Networks
Šrůtka, Petr ; Kováčik, Michal (referee) ; Kajan, Michal (advisor)
This bachelor thesis contains an introduction to packet classification, types of packet classification techniques and different metrics. It describes different algorithms used for packet classification and implementation of Recursive flow classification algorithm is also part of this bachelors thesis. It presents different configuration parameters of RFC algorithm and describes its advantages and disadvantages. This work is concluded with a set of experiments describing characteristics of implemented algorithm together with comparison of other classification approaches.

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