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首页> 外文期刊>Environmental Pollution >Phytoextraction by arsenic hyperaccumulator Pteris vittata L. from six arsenic-contaminated soils: Repeated harvests and arsenic redistribution
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Phytoextraction by arsenic hyperaccumulator Pteris vittata L. from six arsenic-contaminated soils: Repeated harvests and arsenic redistribution

机译：六种砷污染土壤中的砷超富集植物凤尾蕨的植物提取：重复收获和砷再分配

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摘要

This greenhouse experiment evaluated arsenic removal by Pteris vittata and its effects on arsenic redistribution in soils. P. vittata grew in six arsenic-contaminated soils and its fronds were harvested and analyzed for arsenic in October, 2003, April, 2004, and October, 2004. The soil arsenic was separated into five fractions via sequential extraction. The ferns grew well and took up arsenic from all soils. Fern biomass ranged from 24.8 to 33.5 g plant~(-1) after 4 months of growth but was reduced in the subsequent harvests. The frond arsenic concentrations ranged from 66 to 6,151 mg kg~(-1), 110 to 3,056 mg kg~(-1),and 162 to 2,139 mg kg~(-1) from the first, second and third harvest, respectively. P. vittata reduced soil arsenic by 6.4-13% after three harvests. Arsenic in the soils was primarily associated with amorphous hydrous oxides (40-59%), which contributed the most to arsenic taken up by P. vittata (45-72%). It is possible to use P. vittata to remediate arsenic-contaminated soils by repeatedly harvesting its fronds.
机译：该温室实验评估了凤尾蕨去除砷及其对土壤中砷再分配的影响。在6种被砷污染的土壤中生长的P. vittata分别于2003年10月，2004年4月和2004年10月收获并分析了其叶的砷。通过顺序提取将土壤砷分为五个部分。蕨类植物生长良好，并吸收了所有土壤中的砷。蕨类植物在生长4个月后的生物量为24.8至33.5 g植株（-1），但随后的收获期却有所减少。从第一次，第二次和第三次收获开始，砷的叶状浓度分别为66至6,151 mg kg〜（-1），110至3,056 mg kg〜（-1）和162至2,139 mg kg〜（-1）。经过三次收获，P。vittata减少了6.4-13％的土壤砷。土壤中的砷主要与无定形含水氧化物有关（40％至59％），这是造成黑斑假单胞菌吸收砷的最大原因（45％至72％）。通过反复收获其叶状体，有可能利用紫檀来修复受砷污染的土壤。

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