Lai Hung-Yu, Chen Zueng-Sang
Graduate Institute of Agricultural Chemistry, National Taiwan University, Taipei 106-17, Taiwan.
Chemosphere. 2004 Apr;55(3):421-30. doi: 10.1016/j.chemosphere.2003.11.009.
Rainbow pink (Dianthus chinensis), a potential phytoextraction plant, can accumulate high concentrations of Cd from contaminated soils. Vetiver grass (Vetiver zizanioides) has strong and long root tissues and is a potential phytostabilization plant since it can tolerate and grow well in soils contaminated with multiple heavy metals. Soil was moderately artificially contaminated by cadmium (20 mg/kg), zinc (500 mg/kg), and lead (1000 mg/kg) in pot experiments. Three concentrations of Na2-EDTA solution (0, 5, and 10 mmol/kg soil) were added to the contaminated soils to study the influence of EDTA solution on phytoextraction by rainbow pink or phytostabilization by vetiver grass. The results showed that the concentrations of Cd, Zn, and Pb in a soil solution of rainbow pink significantly increased following the addition of EDTA (p < 0.05). The concentrations of Cd and Pb in the shoots of rainbow pink also significantly increased after EDTA solution was applied (p < 0.05), but the increase for Zn was insignificant. EDTA treatment significantly increased the total uptake of Pb in the shoot, over that obtained with the control treatment (p < 0.001), but it did not significantly increase the total uptake of Cd and Zn. The concentrations of Zn and Pb in the shoots of rainbow pink are significantly correlated with those in the soil solution, but no relationship exists with concentrations in vetiver grass. The toxicity of highly contaminating metals did not affect the growth of vetiver grass, which was found to grow very well in this study. Results of this study indicate that rainbow pink can be considered to be a potential phytoextraction plant for removing Cd or Zn from metal-contaminated soils, and that vetiver grass can be regarded as a potential phytostabilization plant that can be grown in a site contaminated with multiple heavy metals.
彩虹石竹（石竹）是一种潜在的植物提取植物，能够从受污染土壤中积累高浓度的镉。香根草（香根草）具有强壮且长的根系组织，是一种潜在的植物稳定植物，因为它能够在受多种重金属污染的土壤中耐受并良好生长。在盆栽试验中，土壤被镉（20毫克/千克）、锌（500毫克/千克）和铅（1000毫克/千克）适度人工污染。向受污染土壤中添加三种浓度的Na2-EDTA溶液（0、5和10毫摩尔/千克土壤），以研究EDTA溶液对彩虹石竹植物提取或香根草植物稳定的影响。结果表明，添加EDTA后，彩虹石竹土壤溶液中镉、锌和铅的浓度显著增加（p<0.05）。施加EDTA溶液后，彩虹石竹地上部分镉和铅的浓度也显著增加（p<0.05），但锌的增加不显著。EDTA处理显著增加了地上部分铅的总吸收量，超过了对照处理（p<0.001），但未显著增加镉和锌的总吸收量。彩虹石竹地上部分锌和铅的浓度与土壤溶液中的浓度显著相关，但与香根草中的浓度无关。高污染金属的毒性并未影响香根草的生长，在本研究中发现其生长良好。本研究结果表明，彩虹石竹可被视为从金属污染土壤中去除镉或锌的潜在植物提取植物，香根草可被视为可在受多种重金属污染场地生长的潜在植物稳定植物。
