جستجوی مقالات مرتبط با کلیدواژه « fraxinus rotundifolia » در نشریات گروه « جنگلداری »

The ability of trees to trap dusts convinces their use for preventing the transport of dust over longer distances. This ability is increasingly important in threatened areas with dust invasion. The purpose of this study was to compare the size and distribution of particles deposited on the leaves surface of Fraxinus rotundifolia, Platanus orientalis, and Robinia pseudoacacia trees, in Paveh, west of Iran. Leaf samples were collected randomly from different heights of 10 individual trees in four main directions and washed thoroughly by distilled water. Dust particles of the solutions were dried-oven. Measurement particles of dusts were done by a particle size distribution instrument, Fritsch analysette22. The measurement of particle size distribution showed that the particles deposited on the leaves surface ranged form 0.65 to 105 micron. orientalis was more effective for dust-retaining particles size less than 10 micron (PM 10) in compare to F. rotundifolia and R. pseudoacacia. The results of this study will open up an avenue for identifying and selecting the appropriate trees for plantation in endangered areas by dusts according to the type, size and distance from the emission source.

Recently, the most important topic in water management was to determine the effects of urban forests and green space on partitioning gross rainfall (GR) into the rainfall interception (I), stemflow (SF), and throughfall (TF). The main aim of this research was to quantify the seasonal variations [Growing Season (GS), and Non-Growing Season (NGS)]) in I by individual Fraxinus rotundifolia trees in the Chitgar Forest Park located in a semiarid climate zone of Iran. From the September 2012 to September 2013, GR and TF were collected through 6 and 12 rain-gauges, respectively. I was calculated as the difference between GR and TF. Fifty rainfall events were recorded and the cumulative GR was measured 156.0 mm. Over the study period, GS, and NGS, I ranged 19.4%, 23.0%, and 16.2%, respectively. Significant positive correlations were observed between I and GR over study period (R= 0.862), GS (R= 0.862), and NGS (R= 0.950) (p

The purpose of this study was to compare the amount of dust deposited on the leaves surface of Fraxinus rotundifolia, Platanus orientalis, and Robinia pseudoacacia in urban areas of Kermanshah Province, west of Iran. Kermanshah, Ravansar, and Paveh regions with different climatic features were selected for sampling. Leaf samples were randomly collected from different heights of individual trees in four main directions and washed and dust particles of the solution were dried in an oven and weighed. The leaf area was measured by Image J software. The results indicated that the amount of dust per unit leaf area of P.orientalis (0.10 mg.cm-2) was significantly different with those of F.rotundifolia (0.045 mg.cm-2) and R.pseudoacacia (0.04 mg.cm-2) (F=66.703). Significant difference was observed between the amount of deposited dusts in Paveh (0.087 mg.cm-2) (F=16.624) and those of the other sites (Kermanshah: 0.041 mg.cm-2and Ravansar 0.053 mg.cm-2). The results of this study will open up an avenue for identifying suitable trees for dust filtration in the west of Iran. Biological activities are underlyingstrategies against dust storms. The leaves, because of the larger surface in comparison with other parts of plant organs, are considered important for atmospheric dust filtration.

Soil pollution caused by cadmium has recently become a major concern. Phytoremediation is a convenient, cost-effective and eco-friendly method for remediation of polluted environments. In this study, the effect of soil texture (clay, clay-loam and silty- clay- loam) on the cadmium accumulation by leaves, stems, and roots of black locust (Robinia pseoudoacacia L.), round-leaf ash (Fraxinus rotundifolia Miller) and Arizona cypress (Cupressus arizonica Greene) was surveyed. The study was carried out in a complete random-based factorial design with four factors (plant species, plant organs, soil texture and cadmium concentration level). At the end of the growing season, the cadmium concentration in the organs was measured. Analysis of variance showed significant deference (P

Phytoremediation technology is the use of plants to remove pollutants such as heavy metals from the environment and accumulation of them in different plant tissues. In this study the ability of two plant species; Robinia pseudoacacia and Fraxinus rotundifolia to remediate the cadmium، was compared. 90 two-years old seedlings of these two species were cultivated in Alborz Research Centre of Karaj in March 2008. The cadmium chloride solutions with the concentrations of 0، 250، 500، 1000 and 2000 mg L-1 were foliar application on the seedlings in June 2009. Then the leaves were collected from the seedlings during two times a year، in August and at the beginning of autumn. Moreover، some samples were supplied from twigs، roots and pot soils in January 2009. The concentrations of cadmium in samples were determined by ICP and the data were analyzed by completely randomized design in SPSS. Results showed significant different between two species in all the organs. The amounts of Cd concentration in F. rotundifolia were higher than R. pseudoacacia in the mature leaf، fall leaf and roots. The amount of Cd in the stem of R. pseudoacacia was higher than the stem of F. rotundifolia. So، it could be concluded that F. rotundifolia is more valuable in accumulation of the cadmium in short time and R. pseudoacacia is more suitable in long time. The maximum concentration in mature leaf of F. rotundifolia was461. 5 mg-1 kg. Therefore، it may be announced as a hyperaccumulator species based on previous studies.

Pollution can be defined as an undesirable change in physiochemical and biological properties of air, water, or land that can damage human or living organism’s health, survival and activities. The pollution induced by heavy metals due to their stability in environment is important. The purpose of this research was to investigate the phytoremediation ability of Nickel uptake for three species including, ash (Fraxinus rotundifolia), willow (Salix alba), and elm (Ulmus densa) around Kermanshah refinery in 2011. Sampling was performed in two locations during growing season in three times, at beginning (May), middle (August), and end (October) of season. Shahed Park which is near the refinery was selected as polluted location and Farabi Hospital far from refinery as control location were selected. ICP method was used to measure nickel content after extraction. Results showed that distance from pollution source and wind direction had not significant effects on nickel dispersion in study locations. Also there was more nickel content in leaves of willow in sampling locations at the beginning of growing season. In addition, the results indicated that the rate of nickel accumulation in ash and elm had upward trend in growing season.

Phytoremediation is an emerging, safety, cost-effective and potentially effective technology applicable for restoration of heavy metals contaminated environment. In order to study the remediation ability of woody plants used in Sanandaj urban forestry, we measured accumulation of Pb, Zn, Cd and Mn in five woody species, including Platanus orientalis, Ulmus carpinifolia, Fraxinus rotundifolia, Biota orientalis and Pinus nigra, planted in the center of Sanandaj, capital of Kurdistan province of I.R. Iran (as a pollutant area) and Kurdistan university court (as a control area) as well. Impact of the metals on some physiological traits of the species were also studied. For this reason, a completely randomized factorial experiment design with two factors, including 1- site at two levels (control and pollutant area) and 2- species at five levels (crock cypress, black pine, ash, elm and plane) with five replications, was used. Results showed that the accumulation of Pb, Zn and Cd in most species in the pollutant area was significantly higher than that of the control area (ρ<0.05). Maximum accumulation of Pb and Cd was observed in B. orientalis, Zn in F. rotundifolia and Mn in U. carpinifolia. The chlorophyll pigment in the leaves of all species in the pollutant area was lower than in the control area, while proline was higher. The highest amount of chlorophyll and proline was observed in P. orientalis and U. carpinifolia, respectively.