Background: Phytoremediation is a method in which plants are used to absorb pollutants. Heavy metals, through competition with nutrients elements, have a significant effect on their distribution in the plant. Methods: In this study, seedlings were exposed to different concentrations (0.50, 100 and 150 ppm) of cadmium nitrate during a growing period in a completely random design with three replications. Then the value of cadmium uptake was measured by atomic absorption device in different organs of c.aronia and j. polycarpos (root, stem and leaf). Results: The obtained results of the analysis of variance showed traits such as stem length, basal diameter, and root length were significantly affected by cadmium metal (P < 0.01).It was also observed that cadmium accumulation in the root and aerial parts of the plant increased with increasing cadmium concentration, and cadmium accumulation in the root tissues was higher in all treatments than aerial parts. In addition, heavy metals reduced the concentration of all nutrientelements in leaves and stems of seedlings. Conclusion: According to the results, Seedlings of c.aronia and j. polycarpos can be suggested as stabilizing varieties for remediation of Cadmium polluted soils. It is worth to note that j. polycarpos, in comparison with c.aronia, is better absorbent of Cadmium. * This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
In this research, some of site and silvicultural characteristics of Yew stand in northern forests of Iran was studied. For this purpose, compartment number 16 of district 4 Shir-ghalaye was selected. According to research purposes, stands with an area of 20 ha were chosen in center of the compartment and was separated from map. Due to restricted area of region and according to few number of Yew trees in the stand, the full-callipering method was conducted for measuring quantitative and qualitative characteristics. In the stand diameter at breast height (D.B.H.), height and canopy diameter of all Yew trees were measured. The results showed that the diameter distribution curve and height distribution curve of Yew trees were similar to even-age forests curve. But according to average annual increment, mixture type of Yew trees in stand, diameter distribution of other species and low rate regeneration of Yew, it can be concluded that the studied Yew stand, is an uneven-age stand and because of low rate regeneration in previous years the number of young Yew trees were reduced and even-age forest curve was formed subsequently. The maximum height and diameter of Yew trees were recorded 26.8 m and 112 cm, respectively. Also, the number of trees per hectare and basal area per hectare of Yew trees were calculated 14.55 and 3.23 m2 respectively.
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