Determine Bioremediation capacity of Taxodium distichum L.

Wetlands as one of the most valuable ecosystems exposed to heavy metal pollution. In recent years, many researches were performed to find a method to remove heavy metals from the environment. Phytoremediation technology has received increasing consideration owning to its characteristics including low impact and cost and environmental friendly nature. This study aimed to determine capacity of Taxodium distichum bioremediation of tree species in environments wich contaminated with heavy metals of lead and cadmium, in a completely randomized design with 4 treatments and 3 replications was used. The results showed that the highest concentrations of these metals were observed in the leaves, stems and roots, 150 and 400 mg kg-1 of cadmium and lead in 18.6, 35.33 and 89.06, cadmium and 23.4, 32.84 and 94.53 mg kg -1 lead respectively. The highest accumulation of metals was underground plant organs and the elements, reduced, in leaf> stem-branch> root respectively. That can low the mobility of the underground organs to shoots. Aaccording to the results it can be concluded that Taxodium distichum is resistant to high levels of cadmium and lead and be able to accumulate these elements in different organs. This plant were suitable for phytostabilization of studied elements with TF>1, and Use of Taxodium distichum as a accumulate plant of metals under study suggested.