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Search Results: 1 - 10 of 835 matches for " Sko?aji? Dragana "
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Public attitude in the city of Belgrade towards invasive alien plant species
Tomi?evi? Jelena,Grbi? Mihailo,SkoajiDragana,Radovanovi? Dragana
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1205189t
Abstract: Biological invasions are seen as a major threat to biodiversity at a global level, while the number of new invasions is increasing at an alarming rate. Raising the awareness of the public, academic world and policy makers about the dangers caused by invasive species, is essential for the creation of the support needed to implement and coordinate the policies necessary to address this problem. The aim of this study is to determine the level of local public awareness of the existence of these plant species, examine the public attitude towards alien invasive plant species and willingness to get involved in the prevention of their spreading. The survey was conducted in four nurseries on the territory of the City of Belgrade and the investigation dealt only with alien invasive woody plant species. Thirty customers were questioned in each of the four nurseries. The results show that local public is uninformed on the issue of invasive plant species. It is necessary to constantly and intensively raise their awareness of this issue, as well as the awareness of harmful consequences that may occur due to the uncontrolled spreading of alien invasive species. This refers not only to the population that visits the nurseries and buys the plants there and to those employed in plant production and selling, but also to the whole local public and decision makers.
Effect of phytohormone balance on shoot multiplication and rooting of the species Dianthus serotinus Waldst. and Kit.
Markovi? Marija,Grbi? Mihailo,SkoajiDragana,?unisijevi?-Bojovi? Danijela
Glasnik ?umarskog Fakulteta , 2007, DOI: 10.2298/gsf0795083m
Abstract: The effect of different phytohormone concentrations on shoot multiplication and shoot rooting was researched on the species Dianthus serotinus. All nutritive media contained MS mineral solution, 3% sucrose, 0.8% agar, 100 mg·L-1 mioinositol, 0.05 mg·L-1 thiamin, 0.25 mg·L-1 nicotinic acid and 1 mg·L-1 glycine. For lateral shoot proliferation, the basic medium was supplemented with BAP (6-benzyl-aminopurine) in concentrations 0.1-2 mg·L-1 and NAA (α-naphthalene-acetic acid) in concentrations 0.1-1 mg·L-1. The best results were achieved on the medium with 0.5 mg·L-1 BAP and NAA. Rooting was most successful (73%) on the medium with 0.5 mg·L-1 NAA.
Spontaneous changes a basis for new ornamental woody plant cultivars
?uki? Matilda,Grbi? Mihailo,SkoajiDragana,?unisijevi? Danijela
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693071d
Abstract: In nursery stock production of some ornamental woody plants the appearance of spontaneous variability was identified in the form of atypical pigmentation of leaves (albinism, variegated, red colored), leaves shape (jaggy) and dwarfs. Mutated plants with variegated leaves were observed among hybrid plane (Platanus x acerifolia (Ait.) Willd.), Siberian elm (Ulmus pumila L.), laurel cherry (Prunus laurocerasus L.) and Lawson false-cypress (Chamaecyparis lawsoniana (Murr.) Parl.) Seedlings. The type of variegation and frequency were analyzed. Among plane tree and Siberian elm seedlings there were observed red colored leaves. Atypical, jaggy shaped leaves were found among laurel cherry seedlings. Dwarf growth was identified at Siberian elm and birch (Betula pendula Roth.) where also found fruits at one year seedling. There were not significant differences in some morphological and physiological properties in plane tree seedlings with various pigmented leaves. .
Amorpha fruticosa L. on wet sites in Belgrade
Radulovi? Stojanka,SkoajiDragana,Bjedov Ivana,?unisijevi?-Bojovi? Danijela
Glasnik ?umarskog Fakulteta , 2008, DOI: 10.2298/gsf0897221r
Abstract: Amorpha fruticosa is in many countries, and also in Serbia, one of the most dangerous invasive species. The detection of mechanisms which inhibit the spreading of Amorpha population would be of great significance for finding the adequate measures of biological control. In this sense, first of all it is necessary, inter alia, to determine Amorpha ecological and coenological characteristics. The vegetation studies of wet sites in Belgrade were compared. The study results indicate that Amorpha is present in forest communities, from the lowest elevations at the timber line to the highest elevations, where the periods of underground and flood waters are the shortest, or where they are absent. Amorpha forms thick brushland on meadows with different water regimes and in forest plantations of different canopy closure. If it is regularly removed by felling, Amorpha does not endanger the structure and the floristic diversity of meadow communities. Amorpha is absent or rare in forest plantations of the densest canopy, as well as in the communities which belong, or once belonged, to the alliance Magnocaricion Br.-Bl.
Presowing treatments for breaking seed dormancy of Hovenia dulcis Thunb.
Grbi? Mihailo,SkoajiDragana,?uki? Matilda,?unisijevi? Danijela
Glasnik ?umarskog Fakulteta , 2006, DOI: 10.2298/gsf0693049g
Abstract: The aim of the experiment was to determine the optimal presowing treat-ment for breaking seed dormancy of Japanese raisin tree (Hovenia dulcis Thunb.), a very rare exotic species introduced to the Mediterranean parts of Serbia and Mon-tenegro. Three pretreatments are applied: mechanical scarification and chemical scarification (conc. H2SO4) lasting for 5 and 120 minutes. The best treatment was the longer chemical scarification, which confirmed the dormancy of the seedcoat.
Quick-dip and contact method of cutting rooting of Zelkova carpinifolia (Pall.) K. Koch as an alternative non-invasive species
Grbi? Mihailo,SkoajiDragana,?uki? Matilda,?unisijevi?-Bojovi? Danijela
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1205051g
Abstract: Two methods of rooting of Zelkova softwood cuttings were analyzed: (1) quick-dip method and (2) contact method - the thin polyethylene film (20 mm) laid directly over the cuttings during the rooting process. The control for contact method was a low tunnel with a thick polyethylene film. One group of cuttings in the contact method was treated with quick-dip (IBA 2,500 μg mL-1, carrier-ethyl alcohol) during 5 sec, and the other group was treated with water solution of IBA (50 μg mL-1) in 24-hour treatment. The third group was control - untreated cuttings. The same groups of cuttings were also used in low tunnels. The number and length of primary and secondary roots were measured on rooted cuttings. The results of all treatments show that contact method in combination with water solution of IBA was the best with 92% of rooted cuttings. No significant differences were obtained between this treatment and quick-dip + contact method (85.3%). Rooting of cuttings under low tunnel was significantly lower. In general, contact method was better than low tunnel, disregarding the carrier used. These results recommend the almost unknown contact method in nursery propagation of Zelkova, as an alternative, non-invasive species for the conditions in Serbia.
Influence of nutrition and various substrates on spruce seedling growth
?uki? Matilda,?unisijevi? Danijela,Grbi? Mihailo,SkoajiDragana
Glasnik ?umarskog Fakulteta , 2004, DOI: 10.2298/gsf0489103d
Abstract: The results of the influence of main macronutrients (N, P, and K) on growth and development of spruce (Picea abies L. Karst) one-year old seedlings are presented. They were grown in containers, in nursery conditions, on four different substrates. There is a good influence on biogenous element contents, height, root collar diameter, needle length and mass, root mass as well as physiological vitality of spruce seedlings. It was observed that the effect of nutrition depends also on the type of substrate.
Improving germination of Chionanthus virginicus L. seed by using gibberellic acid (GAZ)
Grbi? Mihailo,Nikoli? Aleksandar,SkoajiDragana,?uki? Matilda
Glasnik ?umarskog Fakulteta , 2005, DOI: 10.2298/gsf0591089g
Abstract: The aim of this experiment was to explore effects of gibberellic acid on Chionanthus virginicus L. seed germination. The species has great horticultural values but due to problem in propagation it is rarely used. The seed possesses double dormancy: egzo and endo dormancy. Gibberellin has shown helpful in overcoming endo dormancy which is confirmed with this species. Different concentrations of GA3 had different influence. The lower one has shown stimulative effects while the higher one has shown the inhibitor effects. It is also confirmed that endocarp prevents germination.
Influence of nitrogen form on growth of invasive species Acer negundo L. and Ailanthus altissima (Mill.) swingle
?uki? Matilda,?unisijevi?-Bojovi? Danijela,Grbi? Mihailo,SkoajiDragana
Glasnik ?umarskog Fakulteta , 2012, DOI: 10.2298/gsf1205061g
Abstract: Relative amounts of nutrients, especially nitrogen, the most abundant macro-element, and also the distribution of ammonium ions in relation to nitrate ions, in the soils of different ecosystems, are determined by many factors. The most important are: temperature, pH of substrate, accumulation of organic matter, presence of allelopathic compounds, degree of oxygenation, etc. The ability of plants to adapt to these variations influences their production of bio-mass, the rate of expansion in different habitats, and the impact on ecosystem and biodiversity. This paper analyzes the impact of different forms of nitrogen (NO3 - and NH4 +) on the growth of seedlings of invasive species Acer negundo L. and Ailanthus altissima (Mill.) Swingle. The results show that nitrogen nutrition only in the form of NH4 + ions significantly affects the reduction in shoot dry weight. Compared to the nutrition with both forms of nitrogen together, aerial parts of Ailanthus altissima were reduced by 62.5%, and leaf area by 66.7%, while Acer negundo seedlings had reduction in dry mass of aboveground part by 89.5%, root by 81.2% and leaf area by 85.8%. Nutrition with nitrate form of nitrogen led to a proportionally small, but statistically significant decrease in dry mass of aboveground parts and roots as well as leaf area of Acer negundo, while in Ailanthus altissima seedlings, it was only the mass reduction of aboveground parts that was significantly influenced, so it can be assumed that this species is more resistant to the lack of both forms of nitrogen. The fact that both species produced significantly more biomass when nitrogen was present in both forms may be important in controlling the spread of alien species, or in their potential use in phytoremediation.
Asteretum lanceolati: Xenospontaneous community on wet and riparian habitats
Obratov-Petkovi? Dragica,Bjedov Ivana,SkoajiDragana,?unisijevi?-Bojovi? Danijela
Glasnik ?umarskog Fakulteta , 2011, DOI: 10.2298/gsf1103073o
Abstract: Invasive species Aster lanceolatus grows on moist habitats on the whole territory of Serbia. In Belgrade, this species is recorded with a higher degree of presence at a number of localities. With the aim to investigate the community in which this species is dominant, the wide area of Serbia was researched, and 8 localities on the territory of Belgrade were chosen for the analysis of the community. Floristic structure of the community was determined by the standard Braun-Blanquet method (1964), phytogeographical analysis was performed according to Gaji (1980, 1984), and determination of life forms according to Raunkier (Ellenberg, Mueller-Dombois, 1967). pH soil analysis and electric conductivity (EC) were performed at all investigated localities. It was established that the community dominates the moist habitats of Belgrade. It is composed of 104 species and among them Aster lanceolatus Willd., Cichorium intybus L., Agropyrum repens (L.) Beauv., Calystegia sepium (L.) R. Br., Cirsium arvense (L.) Scop., Symphytum officinale L. and Rumex obtusifolius L. are the most frequent. In relation to life forms, the community has hemicriptophytes character, and in relation to phytogeography Euroasian and Middle Europaean floral elements are dominant, with a high presence of cosmopolitan and adventive floral elements. On the locialities Veliko Ratno ostrvo (island) and Maki , EC values point to the fact that the amount of nutrient in the soil is higher than at other localities.
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