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Autor(i)/Author(s): Edyta Rosłon-Szeryńska, Piotr Sikorski, Ewa Zaraś-Januszkiewicz

Názov/Title: The effectiveness of the visual method of hazard tree assessment (WID method) in the management of urban trees

Zdrojový dokument/Source: Plants in Urban Areas and Landscape

Typ dokumentu/Document Type: Proceedings – article

ISBN: 978-80-552-1262-3

DOI: http://dx.doi.org/10.15414/2014.9788055212623.89-93

Vydavateľ/Publisher: Slovak University of Agriculture in Nitra

Rok, strany/PY, pages: 2014, 89-93

Publikované online/Published on-line: 2015-01-23

Jazyk/Language: eng

Abstract: This article aims at assessing the effectiveness of the WID method, developed in 2006 by Rosłon-Szeryńska, in the monitoring of urban trees. Although, the method has found its application in experts research, its development continues with verification of the established criteria. The performance aspects of the method verified so far are: the time consumed for an assessment and the repeatability of the results in varying seasons. A survey was conducted on 125 trees, growing by the Rozbrat street in Warsaw. The sample underwent two evaluations with the interval of 6 months (January, July). The attained data was put through a comparative analysis, investigating differences in the intensity of the analyzed tree characteristics, the hazard tree risk score and the time required for an assessment in winter and summer. On the basis of the results, effectiveness and repeatability of the WID method were determined. High consistency marked the score of the likelihood of breakage in the base of the trunk (96%) and in the fork (83%). Significant differences were observed in the evaluation of the likelihood of breakage in the crown (Chi2 = 0.001). The risk of an accident caused by hazard tree score was consistent throughout both surveys (from 49% for windthrows to almost 100% for breakage in the base of the trunk). Discrepancies in the results were caused by the lack or existence of foliage, the seasonal appearance of tree fungus and insects, and the snow cover in the root zone. The research was compared with the results of an inspection by the trees administrator, which declared three times more trees to be removed than the WID method would allow.

Keywords: hazard tree, visual method, tree risk, tree assessment, urban trees

Práva/Rights: Act on copyright and rights related to copyright (Copyright Act) as amended (consolidated version), Slovak Republic; Creative Commons Attribution 4.0 Licence
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Toto dielo je publikované pod/This work is licensed under a Creative Commons Attribution 4.0 International License.