Faculty of Agriculture Food and Natural Resources, The University of Sydney, Sydney, Australia.
Int J Phytoremediation. 2011 Oct;13(9):912-32. doi: 10.1080/15226514.2011.568023.
This study examined the phytoextraction potential of two arsenic (As) hyperaccumulators, Pteris vittata L. and Pityrogramma calomelanos var. austroamericana at a historical As-contaminated cattle dip site in northern New South Wales (NSW), Australia. Total As concentration in the surface soil (0-20 cm) showed a better spatial structure than phosphate-extractable As in the surface and sub-surface soil at this site. P. calomelanos var. austroamericana produced greater frond dry biomass (mean = 130 g plant(-1)) than P. vittata (mean = 81 g plant(-1)) after 10 months of growth. Arsenic concentration and uptake in fronds were also significantly higher in P. calomelanos var. austroamericana (means = 887 mg kg(-1) and 124 mg plant(-1)) than in P. vittata (means = 674 mg kg(-1) and 57 mg plant(-1)). Our results showed that under the field conditions and highly variable soil As at the site, P. calomelanos var. austroamericana performed better than P. vittata. We predict that P. calomelanos var. austroamericana would take approximately 100 years to reduce the total As to below 20 mg kg(-1) at the site compared to > or =200 years estimated for P. vittata. However, long-term data are required to confirm these observations under field conditions.
本研究考察了两种砷（As）超富集植物，凤尾蕨（Pteris vittata L.）和井栏边草（Pityrogramma calomelanos var. austroamericana）在澳大利亚新南威尔士州（NSW）北部一个历史上砷污染的牛浸浴场的植物提取潜力。该地点表层土壤（0-20cm）中的总砷浓度显示出比表层和亚表层土壤中可提取磷的砷更好的空间结构。经过 10 个月的生长，井栏边草 var. austroamericana 的叶片干生物量（平均值=130g 植物（-1））明显高于凤尾蕨（平均值=81g 植物（-1））。叶片中的砷浓度和吸收量在井栏边草 var. austroamericana 中也明显高于凤尾蕨（平均值=887mg kg（-1）和 124mg 植物（-1））（平均值=674mg kg（-1）和 57mg 植物（-1））。我们的研究结果表明，在该地点的田间条件和土壤砷高度变化的情况下，井栏边草 var. austroamericana 的表现优于凤尾蕨。我们预测，与估计需要>或=200 年的凤尾蕨相比，井栏边草 var. austroamericana 将需要大约 100 年才能将总砷浓度降低到 20mg kg（-1）以下。然而，需要长期数据来证实这些在田间条件下的观察结果。
