Wei Chao-Yang, Wang Cheng, Sun Xin, Wang Wu-Yi
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, A11 Datun Road, Anwai, Chaoyang District, Beijing, 100101, China.
Environ Geochem Health. 2007 Jun;29(3):169-77. doi: 10.1007/s10653-006-9046-0. Epub 2007 Jan 26.
The objective of this study reported here was to characterize arsenic (As) accumulation by Pteris ferns by comparing 3 of the ferns of this genus with each other as well as with four non-Pteris ferns growing on seven sites in southern China with different As levels. A total of 112 samples, including 78 Pteris vittata, 13 P. cretica, 3 P. multifida and 18 ferns from other non-Pteris genera, with the soils in which they grew were collected for As and other elemental analyses. P. vittata was found to be the most dominant species and the most efficient As-accumulator, whereas P. multifida was the lowest As-accumulator among the Pteris ferns, with 4.54-3599, 28.7-757 and 11.2-341 mg kg(-1) As recorded in the fronds of P. vittata, P. cretica and P. multifida, respectively. Arsenic concentrations in non-Pteris ferns were generally much lower than those in Pteris ferns, with 0.81-1.32, 3.59, 10.7, 6.17-24.3 mg kg(-1) in the fronds of Blechumum orientale, Dicranopteris dichotoma, Pteridium aquilinum and Cyclosorus acuminatus, respectively. For P. vittata, the As bioaccumulation factor (ratio of As in fronds to that in soils) changed, whereas the As translocation factor (ratio of As in fronds to that in roots) remained unchanged among the different sites. The concentrations of Fe were very high in all of the collected fern sample, with the exception of B. orientale, with 207-6865, 637-3369, 375-1856, 1876, 493-6865 and 492 mg kg(-1) in the fronds of P. vittata, P. cretica, P. multifida, C. acuminatus, P. aquilinum and D. dichotoma, respectively. The association between Fe accumulation and As accumulation and tolerance in these ferns indicates the unique role of Fe in As-hyperaccumulation.
本研究的目的是通过比较该属的3种蕨类植物以及与生长在中国南方7个不同砷含量地点的4种非凤尾蕨属蕨类植物，来描述凤尾蕨属蕨类植物对砷（As）的积累特征。共采集了112个样本，包括78株蜈蚣草、13株克里特岛凤尾蕨、3株多羽凤尾蕨和18株其他非凤尾蕨属的蕨类植物，以及它们生长的土壤，用于砷和其他元素分析。发现蜈蚣草是最主要的物种，也是最有效的砷积累植物，而多羽凤尾蕨是凤尾蕨属蕨类植物中砷积累量最低的，蜈蚣草、克里特岛凤尾蕨和多羽凤尾蕨的叶中砷含量分别为4.54 - 3599、28.7 - 757和11.2 - 341 mg kg⁻¹。非凤尾蕨属蕨类植物中的砷浓度通常远低于凤尾蕨属蕨类植物，东方乌毛蕨、芒萁、蕨和渐尖毛蕨叶中的砷含量分别为0.81 - 1.32、3.59、10.7、6.17 - 24.3 mg kg⁻¹。对于蜈蚣草，不同地点的砷生物积累因子（叶中砷与土壤中砷的比值）有所变化，而砷转运因子（叶中砷与根中砷的比值）保持不变。除东方乌毛蕨外，所有采集的蕨类植物样本中的铁浓度都非常高，蜈蚣草、克里特岛凤尾蕨、多羽凤尾蕨、渐尖毛蕨、蕨和芒萁叶中的铁含量分别为207 - 6865、637 - 3369、375 - 1856、1876以及493 - 6865和492 mg kg⁻¹。这些蕨类植物中铁积累与砷积累及耐受性之间的关联表明了铁在砷超积累中的独特作用。
