Mahboobeh Abasi; Mohammad Ali Zare Chahouki; Hossein Bagheri
Abstract
The main objectives of this study were to prepare a prediction map of the potential habitat of Agropyron intermedium and Find important factors influencing the establishment and distribution of this species and the preferred tendency of the species was relative to environmental factors Using the Maxent ...
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The main objectives of this study were to prepare a prediction map of the potential habitat of Agropyron intermedium and Find important factors influencing the establishment and distribution of this species and the preferred tendency of the species was relative to environmental factors Using the Maxent model. For modeling, region condition information was prepared including topography, climate, geology and soil, satellite images, digital elevation model (DEM), geology map, and climatology data. Then soil and plants sampling was performed and Soil samples were transferred to the lab. Soil properties were measured including gravel, pH, EC, lime, organic matter, N, K, P, sand, clay, and silt in the laboratory. Geostatistical methods were used for data analysis and mapping of environmental variables and the Maxent model was used for prediction maps. Kappa coefficient indicates that the Maxent model predicted A. intermedium habitat at a very good level (kappa = 0.85). Also, the accuracy of the classification of habitat maps predicted in the Maxent model is acceptable according to the analysis of the area under the curve (AUC = 0.771). The results showed that topographic variables and clay soil factor in the occurrence and distribution of A. intermedium has the greatest effect and increasing lime and ec have a negative influence on the presence of this species. A. intermedium is a desirable species that in addition to being used in creating hand-planted pastures, it is very important in improving and developing rangelands, especially in cold regions. Therefore, maintaining genetic and scientific,
Javad Daeizadeh; MAHSHID souri; Ehsan Zandi Isfahan; javad motamedi
Abstract
Total Petroleum Hydrocarbons are toxic and persistent pollutants that are considered as fundamental threat to the ecosystem. Phytoremediation, the use of plants for remediation of contaminated soils, is an effective and affordable way to reduce soil pollution. In this study, the potential phytoremediation ...
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Total Petroleum Hydrocarbons are toxic and persistent pollutants that are considered as fundamental threat to the ecosystem. Phytoremediation, the use of plants for remediation of contaminated soils, is an effective and affordable way to reduce soil pollution. In this study, the potential phytoremediation of pasture plants i.e. Agropyron intermedium and Dactylisglomerata in soil contaminated with crude oil of different concentrations (20, 30, 40 and 50 percent) was scrutinized for 120 days under greenhouse condition. At the end of the study, changes in biological factors (shoot height, shoot dry weight and root dry weight) of each species and changes in petroleum hydrocarbons of soil were measured and results were analyzed using SPSS software. The process of decay kinetics curve of petroleum percent was used to calculate the time it takes for decomposition of petroleum hydrocarbons. Results showed that three main features of biological factors of both studied species in different treatments were significantly different compared to control group. Analysis of changes in petroleum hydrocarbons indicated that Agropyronintermedium reduced 79.81 percent of oil in the treatment of 20% and reduced 58.54 percent of oil in the treatment of 50%. Therefore, it has higher phytoremediation ability in comparison with Dactylisglomerata. The results of the analysis of petroleum in soil samples, fitted with zero-order kinetic model showed that the first order kinetic model is the best model for simulating the trend of changes of Petroleum hydrocarbon of the soil
M Jafari; H Azarnivand; A Hajibaglo; E Alizadeh
Volume 63, Issue 3 , December 2010, , Pages 307-318
Abstract
This study investigates the relationship between litter quality and aerial parts of plant on C, N, K, P and C/N ratio of soil in four rangeland species including Agropyron intermedium, Bromus tomentellus, Eurotia ceratoides and kochia prostrata. After recognizing the sites of these species in Hamand ...
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This study investigates the relationship between litter quality and aerial parts of plant on C, N, K, P and C/N ratio of soil in four rangeland species including Agropyron intermedium, Bromus tomentellus, Eurotia ceratoides and kochia prostrata. After recognizing the sites of these species in Hamand Absard located in 65 km of northern Tehran, at the end of growing season, samples of litter, aerial part of plants and soil were taken using systematic- random method. For this purpose, five transects, each of l00 m length and 50 m spacing were taken. Two plots in each transect with an area of 1 m2 were established. In each plot, soil samples under plants and without plant area (control samples) at depth of 0-30 cm were taken. The C, N, P, K, EC, pH and texture of samples were analyzed in laboratory. Analysis of variance, Dunnett's test and t-student test were applied to the data. Results show that in the aerial part of plant, C and C/N ratio of Agropyron intermedium and P, K and N of Kochia prostrata are higher than other species. In case of litter, C, K and C/N of Eurotia ceratoides and N and P of Kochia prostrata showed higher values. However the results of soil samples show that C of Agropyron intermedium, N and C/N of Kochia prostrata and K of Bromus tomentellus are higher than other species. Totally, Kochia prostrata showed the best litter quality, decomposition rate and effects on soil.
