摘要
【目的】探明砷在超富集植物蜈蚣草不同叶位羽片中的分布,为优化采样方法进而准确评估植物修复效率提供依据。【方法】采用大田取样与室内分析相结合的方法,研究不同叶位的蜈蚣草羽片中砷分布的规律。【结果】蜈蚣草不同叶位羽片中砷浓度差异较明显:中部羽片砷浓度分别是基部羽片和顶部羽片的35%和37%,由基部羽片到顶部羽片砷浓度变化现先降低后升高的变化趋势,随着羽片叶位增加呈"U"型分布。蜈蚣草羽叶中部羽片砷富集量是基部羽片的3.1倍,是顶部羽片的2.8倍,蜈蚣草羽叶砷富集量中部羽片较高,基部羽片和顶部羽片较低,呈倒"U"型分布。【结论】中部羽片砷浓度较低,但砷累积量较大,因此通过采集羽片样品来评估蜈蚣草修复效率时要兼顾底部羽片、中部羽片和顶部羽片。
[ Objective ]Chinese brake fern （Pteffs vittata L） has been identified as an arsenic （As） hyperaccumula- tor. The present study was conducted to obtain insight into accumulation of As and its distribution in pinnae of P. vittata L. ,which provide the basis to optimize the sampling method and evaluate the phytoremediation efficiency accurately. [ Method ]Field sampling and laboratory analysis were used to research As accumulation and distribution in pinnae of hy- peraccumulator P. vittata L. [ Result ]As concentration in pinnae varied depending on their position along the frond. As concentration in the middle pinnae accounted for 35% and 37% of the basal and top pinnae ,respectively. Therefore, there was a ＂U＂-type distribution of As concentration along the frond. For As accumulation ,based on biomass and As concentration in the middle pinnae was 3.1 times and 2.8 times higher than those in the basal and top pinnae, showing a ＂∩ ＂-type distribution in the high-As P. vittata. [ Conclusion ]As concentration in the middle pinnae is low,while As accumulation was high,therefore,the basal,middle and top pinnae should be given consideration while evaluating the phytoremediation efficiency in phytoremediation projects accurately.
出处
《南方农业学报》
CAS
CSCD
北大核心
2015年第5期755-759,共5页
Journal of Southern Agriculture
基金
National Natural Science Foundation(41071215)
Guangxi Natural Acience Foundation(2014GXNSFBA118223)
关键词
蜈蚣草
砷
羽片
富集
分布
P. vittata L.
arsenic
pinnae
accumulation
distribution
