1. A note on acyclic number of planar graphsMirko Petruševski, Riste Škrekovski, 2017, original scientific article Abstract: The acyclic number ▫$a(G)$▫ of a graph ▫$G$▫ is the maximum order of an induced forest in ▫$G$▫. The purpose of this short paper is to propose a conjecture that ▫$a(G)\geq \left( 1-\frac{3}{2g}\right)n$▫ holds for every planar graph ▫$G$▫ of girth ▫$g$▫ and order ▫$n$▫, which captures three known conjectures on the topic. In support of this conjecture, we prove a weaker result that ▫$a(G)\geq \left( 1-\frac{3}{g} \right)n$▫ holds. In addition, we give a construction showing that the constant ▫$\frac{3}{2}$▫ from the conjecture cannot be decreased.
Keywords: induced forest, acyclic number, planar graph, girth
Published in RUP: 03.01.2022; Views: 974; Downloads: 16
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2. Life cycle assessment - opportunities for forest products sectorAndreja Kutnar, Callum A. S. Hill, 2017, original scientific article Keywords: environmental impact, environmental product declaration (EPD), forest products, life cycle assessment (LCA), O-LCA, product category rules (PCR), S-LCA, wood
Published in RUP: 15.11.2017; Views: 3172; Downloads: 92
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3. Phytosociology and ecology of the Dinaric fir-beech forests (Omphalodo-Fagetum) at the north-western part of the Illyrian floral province (nw Dinaric Alps)Boštjan Surina, Igor Dakskobler, 2013, original scientific article Keywords: Aremonio-Fagion, biogeography, Dinaric Alps, Illyrian floral province, Fir-Beech forest, Omphalodo-Fagetum, Trnovski gozd plateau, phytosociology, vegetation
Published in RUP: 03.04.2017; Views: 3466; Downloads: 132
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4. Communicating forest sector sustainability : results from four European countriesE. Korhonen, Anne Toppinen, K. Lähtinen, L. Ranacher, Andrea Werner, Tobias Stern, Andreja Kutnar, 2016, original scientific article Abstract: Communication is an important tool in maintaining legitimacy and acceptability of forest sector operations and activities, and expectations by the general public on the forest sector conduct in Europe are in general very high. Despite this, there is scarce research in crossnational context on how forest sector sustainability is communicated to the general public, and what development areas can be identified in terms of communication content. This study applies a qualitative content analysis in four forestry-rich European countries (Austria, Finland, Germany and Slovenia). The state of online communication of 61 companies and 19 industry associations was qualitatively analyzed in 2014 with a focus on eight core sustainability topics of interest that were identified via an international forest sector stakeholder feedback process. Our results show some great similarity, but also some interesting differences in terms of communication frequency and weight of hot topics across countries. The most frequently communicated area was economic contribution of forests (in Finland and Austria); debate over forest conservation versus production (Germany) and the concept added value of wood (in Slovenia). With the exception of Slovenia, role of forests in combatting global warming was emphasized more frequently within industry associations than among individual forest industry companies. Characteristically, current content of sustainability communication focuses on supplying factual information. Thus, there is a need for developing more targeted and bidirectional forms of stakeholder communication in the future, emphasizing also more active use of social media channels and empowering organizations to promote interactive communication and collaborative learning.
Keywords: communication, sustainability, stakeholder, forest sector, Europe
Published in RUP: 08.08.2016; Views: 2983; Downloads: 239
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5. Rodent damage to natural and replanted mountain forest regenerationMarta Heroldová, Josef Bryja, Eva Jánová, Josef Suchomel, Miloslav Homolka, 2012, original scientific article Abstract: Impact of small rodents on mountain forest regeneration was studied in National Nature Reserve in the Beskydy Mountains (Czech Republic). A considerable amount of bark damage was found on young trees (20%) in spring after the peak abundance of field voles (Microtus agrestis) in combination with long winter with heavy snowfall. In contrast, little damage to young trees was noted under high densities of bank voles (Myodes glareolus) with a lower snow cover the following winter. The bark of deciduous trees was more attractive to voles (22% damaged) than conifers (8%). Young trees growing in open and grassy localities suffered more damage from voles than those under canopy of forest stands (X2=44.04, P < 0.001). Natural regeneration in Nature Reserve was less damaged compared to planted trees (X2=55.89, P < 0.001). The main factors influencing the impact of rodent species on tree regeneration were open, grassy habitat conditions, higher abundance of vole species, tree species preferences- and snow-cover condition. Under these conditions, the impact of rodents on forest regeneration can be predicted. Foresters should prefer natural regeneration to the artificial plantings
Keywords: forest regeneration, mountain forest, small rodents, Czech Republic
Published in RUP: 15.10.2013; Views: 2883; Downloads: 83
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