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Jastrebarsko, Croatia

Krajter Ostoic S.,Croatian Forest Research Institute | Konijnendijk van den Bosch C.C.,Swedish University of Agricultural Sciences
Urban Forestry and Urban Greening

The concept of urban forestry is addressed from a discursive perspective, with focus on identifying and describing various scientific discourses, their strength and development over time and on different continents. This work can help obtain a deeper understanding of the scientific discourses in terms of identifying research trends and reasons behind these trends, as a possible way forward for research. Scientific publications (. N=. 519) issued during the period 1988-2014 (and as listed in the SCOPUS database) were analysed with the aims to 1) systematically identify and describe scientific urban forestry discourses, 2) discuss implications of these findings for scientific practice, and 3) propose ways forward. Six discourses of various strength and geographical distribution were identified. Scientific production was found to be dominated by North American and European authors with modest contributions from authors from other continents. Scientific discourses proved mostly expert driven and reflecting the positivist scientific paradigm. Prevailingly managerial orientation and absence of qualitative approaches indicate a lack of deeper understanding of human-environment relations. Studies related to active participation of citizens and partnerships in urban forestry have been missing. More emphasis should be placed on the testing of existing, and developing new methods and modalities of public participation, and on the value of civic involvement for the decision making. Moreover, a more solid evidence base is needed for benefits from urban forests, while economic aspects of biodiversity and other ecosystem services are still insufficiently explored. Study findings also call for more research on urban forest governance and relation between urban forest benefits and existing policies (e.g. climate change adaptation, energy policy or health). © 2015 Elsevier GmbH. Source

Halder P.,University of Eastern Finland | Paladinic E.,Croatian Forest Research Institute | Stevanov M.,University of Novi Sad | Orlovic S.,University of Novi Sad | And 2 more authors.
Renewable and Sustainable Energy Reviews

Private forests in Croatia and Serbia are highly fragmented in small plots with low productivity and owned by a large number of small-scale nonindustrial private forest owners (NIPFs). The study conducted surveys among 232 NIPFs in these two countries to find out their perceptions and attitudes related to energy wood production from their forests. The secondary objective of the study was to provide policy recommendations to the public authorities and professionals in these countries for improving the preconditions for energy wood mobilization from private forests. The study found that the NIPFs perceived underdeveloped market and low price for energy wood, absence of favorable policies, fragmented forests properties, older NIPFs' lack of interests in energy wood production, and difficulties in getting bank loan for energy wood related business activities as barriers against energy wood production from private forests. However, the NIPFs showed positive attitudes towards producing energy wood from their forests and they considered the possibilities of creating new jobs and commercial opportunities as strengths of energy wood production. The NIPFs' socio-demographic background had statistically significant relations with their perceptions and attitudes related to energy wood production. The dimensions of the NIPFs' perceptions and attitudes related to energy wood production showed two key dimensions - institutionalists and enthusiasts. The variables to explain the NIPFs' attitudes to energy wood production were different between the two countries and they indicated the differences in the country level circumstances for energy wood production. The results appeared to be relevant for understanding the issues that the NIPFs perceived as barriers against developing a viable energy wood market in their countries. When new forestry institutions and policies are emerging in these countries, the existing public and private forestry institutions need to play an important role for improving the preconditions for energy wood production from private forests. © 2014 Elsevier Ltd. All rights reserved. Source

Prka M.,State enterprise | Krpan A.P.B.,Croatian Forest Research Institute
Acta Silvatica et Lignaria Hungarica

The effects of management of even-aged beech stands on the quality of beech timber assortments by type of cut were investigated in the region of Bjelovar. The research was carried out using Croatian timber standards. Assortment tables were developed separately for thinning and intermediate felling, and separately for regeneration and final felling in accordance with the interventions of management. The average shares of assortments maintained the same ratios by quality classes regardless of the applied standards (HRN or HRN EN). The research identified the problems in production of assortments, and justified the need for developing separate tables for thinning, intermediate felling, and for regeneration and final felling. Through forest management the quantity and quality of timber assortments may be oriented to a certain extent towards the production target. With the application of tending measures the value of the stand and timber assortments increases over time. In economic respect, the development of false heartwood shows an opposite trend. Therefore a compromise must be achieved by proper management and determination of appropriate harvesting age of beech stands. Source

Matosevic D.,Croatian Forest Research Institute | Melika G.,Plant Health and Molecular Biology Laboratory
Bulletin of Insectology

Research on recruitment of native parasitoids on the recently introduced invasive species Dryocosmus kuriphilus has been carried out on four sites in 2011 and 2012 in Croatia. In total 15 species of native parasitoids were reared which belong to 5 of 6 chalcid families attacking native oak cynipid gallwasps (Eupelmidae - 2, Eurytomidae - 4, Ormyridae - 1, Pteromalidae - 4 and Torymidae - 4 species). This research has shown that the time lag between introduction of new host and recruitment of native parasitoids is short. Sex ratios for the most abundant parasitoid species appeared to be female-biased and the parasitoid emergence rate for all sites was relatively low. Torymus flavipes was recorded from D. kuriphilus at all sites and in both years and was the most abundant species exploiting the new host. Among other species, especially T. flavipes and Megastigmus dorsalis, which have been reared from D. kuriphilus galls, could provide a good possibility for biological control but further research is needed. Source

Cvjetko Bubalo M.,University of Zagreb | Hanousek K.,University of Zagreb | Radosevic K.,University of Zagreb | Gaurina Srcek V.,University of Zagreb | And 2 more authors.
Ecotoxicology and Environmental Safety

We studied the effects of five imidiazolium based ionic liquids with different anions and length of alkyl chains linked to imidazolium ring on the early development of barley (Hordeum vulgare). The inhibitory effect depends on the ionic liquids concentration and chemical structure, whereby the most toxic one was [C10mim][Br], followed by [C7mim][Br], [C4mim][Br], [C4mim][CH3CO2] and [C4mim][BF4]. Both anion and cation structures affected the toxicity of ionic liquid indicating that selection of more biocompatible anions such as [CH3CO2] does not necessarily indicate lower toxicity. Alternation in the extent of oxidative stress and antioxidant enzymes activities were found in barley plants due to ionic liquid treatments. When seedlings were exposed to higher concentrations of ionic liquids, antioxidant system could not effectively remove reactive oxidative species, leading to lipid peroxidation and damage of the photosynthetic system. However, overall data indicated that the performance of barley seedling was improved when all measured enzymes involved in scavenging of reactive oxygen species (ROS) were increased with special emphasis on GPX activities. Since there are no studies about ionic liquid (IL) toxicity in plants, that simultaneously evaluates the antioxidative enzyme system in response to different ILs, this work is valuable for gaining knowledge about the protection mechanism of plants from oxidative stress caused by IL exposure. © 2014. Source

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