esfandiyar jahantab

This study aimed to introduce and investigate the rangeland plants of Stipagrostis plumosa, Calotropis procera L. and Medicago sativa remediation of contaminated soils with heavy metal of Pb in the greenhouse condition under treatments of urban waste compost and biochar at three levels (0, 1 and 2 percentage) in a completely randomized design with 5 replications. The soil used in this study was collected from the petroleum-contaminated traditional Pazanan. After six-month, aerial and underground parts of plant have collected and some important characteristics of soil, morphological properties of plant and some elements have been examined. ICP-OES is used for Pb measurement. Translocation factor, remediation factor and biological aggregation factor measured for the assessment of plants remediation potential. The results showed that C. procera and St. plumosa absorb and extract Pb through phyto-extraction from petroleum contaminated soils. C. procera had the most RF (0.08) for lead under biochar 1 and 2 percentage treatment , while the least amount of RF (0.02) found for St. plumosa in control samples . Therefore, according to the current results; C. procera L has good potential to apply for phytoremediation in petroleum contaminated soils.

The purpose of this study was to investigate the tolerance of various plant species to heavy metals in oil polluted region of Pazanan Gachsaran. Three zones with various distances from highly polluted area were selected including 0 to 500 m, 500 to 1000 m and 1000 to 1500 m from pollution sources. Thirty plots of 2×2 were established in each transect and their vegetation characteristics were measured. Fifteen soil samples were collected and ICP- OES Instrument was used to measure Ni and Pb contents. Translocation Factor, Bio Concentration Factor and Biological Accumulation Coefficient indicators were used to evaluate the potential of 24 plant species from 12 families to absorb heavy metals. Results showed that the concentration of total and exchangeable soil Pb and Ni varied significantly between the various pollution zones. Xanthium spinosum L. ¡ Alhagi camelorum¡ Sinapis arvensis L.¡ Calotropis procera L.¡ Stipagrostis plumosa ¡Avena fatua L and Cynodon dactylon have Hyperaccumulator characteristics for Pb absorption Stipagrostis plumosa¡ Calotropis procera L.¡ Xanthium spinosum L.¡ Centaurea iberica¡ Sinapis arvensis L. ¡ Stipa capensis and Cynodon dactylon were identified as plant species with high accumulating potential for Ni. According to the results, some plant such as Stipagrostis plumosa¡ Calotropis procera L. and Sinapis arvensis L. have high potential for phytoremedation purposes and can be recommended in soil, contaminated soil containing Ni and Pb.