Document Type : Research Paper


1 Forest, Range and Watershad Management Organization

2 Assistant Professor, Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

3 Assistant Professor, Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

4 Professor associated, Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran


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


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