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作 者 ：李文学,陈同斌,刘颖茹

期 刊 ：生态学报 2005年 25卷 3期 页码：538~542

关键词：蜈蚣草；超富集植物；刈割；砷；吸收；植物修复效率；

Keywords:Chinese brake （Pteris vittata L.）, hyperaccumulator, harvesting, arsenic, accumulation, phytoextraction efficiency,

摘 要 ：以野生苗移栽的蜈蚣草为试材 ,通过盆栽试验研究了收获次数对蜈蚣草生长、砷吸收和植物修复效率的影响。结果表明 :在 3次收获中 ,随着收获次数的增加 ,不同砷浓度处理之间蜈蚣草生物量的差异逐步缩小 ;不加砷的对照处理中 ,每次收获后的砷吸收速率下降趋势 ,而在 3个加砷处理中 ,第 2次收获和第 3次收获的蜈蚣草的吸砷速率为 6 3～ 75 μg/ (plant· d)、4 4～ 5 5μg/ (plant· d) ,均显著高于第 1次收获时的吸收速率。表明多次收获并没有降低砷的积累速度。由此可见 ,通过适当增加蜈蚣草的收获次数是提高砷修复效率的一种策略。

Abstract:Arsenic (As) contamination of soils is a major environmental problem both in China and in the world. Chinese brake (Pteris vittata L.), which has a strong ability to tolerate and hyperaccumulate As, is a good candidate for phytoremediation of arsenic-contaminated soils. To understand the processes of As hyperaccumulation by P. vittata and to take P. vittata into practice, a growing body of researches has been carried out on understanding the mechanisms of As tolerance and hyperaccumulation, including the As...

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