ABSTRACT

Soil contamination with heavy metals has become a worldwide concern. A sustainable technology to mitigate heavy metal contamination is extremely important. Phytoremediation is a cost-effective method, environmentally friendly, and esthetically pleasing. The aim of this study was to investigate the potential of Vetiver phytoremediation of soils contaminated with heavy metals. This research was conducted as a factorial design with four different heavy metals (lead, cadmium, manganese, and nickel) with three varying levels and also three replications for each treatment. Statistical analysis of data was performed using SPSS19 software and analysis of variance, Duncan and Pearson correlation tests. The results showed that, the highest uptake rate was related to lead metal with 282.45 mg/kg of dry soil and 83.4% uptake percentage. Then, the mean and percentage of adsorption for cadmium, nickel and manganese were 248.3 mg/kg (53.2%), 69.4 mg/kg (65.5%), and 63.29 mg/kg (61%), respectively. Lead was found to be the main component of uptake by Vetiver plant. It was found that the roots of the plant have absorbed more heavy metals than the shoots. And at the roots in total 1089.05 and on average 363.01 mg/kg and at the shoots 901.19 and on average 300.39 mg/kg, the metals used were adsorbed on three levels and four treatments. The results of analysis of variance, Duncan test and Pearson correlation showed that the effect of applied treatments on lead uptake in roots and shoots increased significantly (P ≤ 0.05) with increasing levels of treatments. The biological concentration factor was more than one, and the transfer factor was close to one. Therefore, it can be used as a phytostablization plant. The results showed that Vetiver can be considered as a refining plant due to its vegetative characteristics, cost-effectiveness and high adaptation to environmental conditions.

摘要

重金属污染土壤已成为世界关注的问题。减轻重金属污染的可持续技术极为重要。植物修复是一种经济有效，环保且美观的方法。这项研究的目的是研究香根草对被重金属污染的土壤进行植物修复的潜力。这项研究是采用四种不同重金属（铅，镉，锰和镍）的析因设计进行的，每种重金属具有三种不同的含量，每种处理也具有三种重复性。使用SPSS19软件对数据进行统计分析，并对方差，Duncan和Pearson相关检验进行分析。结果表明，铅的吸收率最高与铅金属有关，其含量为282.45 mg / kg的干燥土壤和83.4％的吸收率。然后，镉，镍和锰的平均吸附率分别为248.3 mg / kg（53.2％），69.4 mg / kg（65.5％）和63.29 mg / kg（61％）。发现铅是香根草植物吸收的主要成分。发现植物的根比芽吸收了更多的重金属。根系总金属含量为1089.05，平均为363.01 mg / kg，枝条为901.19，平均含量为300.39 mg / kg，所用金属在三种水平和四种处理下均被吸附。方差分析，Duncan检验和Pearson相关性的分析结果表明，施用处理对根和芽中铅吸收的影响显着增加（发现铅是香根草植物吸收的主要成分。发现植物的根比芽吸收了更多的重金属。根系总金属含量为1089.05，平均为363.01 mg / kg，枝条为901.19，平均含量为300.39 mg / kg，所用金属在三种水平和四种处理下均被吸附。方差分析，Duncan检验和Pearson相关性的分析结果表明，施用处理对根和芽中铅吸收的影响显着增加（发现铅是香根草植物吸收的主要成分。发现植物的根比芽吸收了更多的重金属。根系总金属含量为1089.05，平均为363.01 mg / kg，枝条为901.19，平均含量为300.39 mg / kg，所用金属在三种水平和四种处理下均被吸附。方差分析，Duncan检验和Pearson相关性的分析结果表明，施用处理对根和芽中铅吸收的影响显着增加（P ≤0.05）随着治疗水平。生物浓缩因子大于1，转移因子接近1。因此，它可以用作植物稳定植物。结果表明，香根草由于其营养特性，成本效益以及对环境条件的高度适应性，可以被视为精炼厂。