【摘要】 通过盆栽试验,研究了镍富集植物A.murale、A.corsicum及普通作物萝卜和芥菜,在4种不同Ni含量土壤中富集Ni的能力.A.murale和A.corsicum能够超量富集Ni,在4种土壤处理中,其地上部Ni浓度均显著高于萝卜和芥菜.在墨江土壤(Ni 1062mg/kg)中,A.murale和A.corsicum去除Ni能力明显大于萝卜和芥菜;在信宜土壤(Ni 107mg/kg)中,芥菜去除Ni能力最强;而元江土壤(Ni 2519mg/kg)中4种植物去除Ni的能力均很低.调节土壤pH值能显著改变A.murale和A.corsicum提取Ni的能力,最佳去除Ni土壤pH值在6.0左右.酸化及碱化处理蛇纹岩发育土壤均显著降低了A.murale和A.corsicum去除土壤Ni的能力.更多还原

【Abstract】 Pot experiment was conducted to investigate nickel phytoextraction from four types of Ni-contaminated soils by Ni-hyperaccumulators Alyssum corsicum,Alyssum murale,and non-hyperaccumulators radish,mustard.Ni concentration in shoot of A.corsicum and A.murale was significantly higher than radish or mustard in all tested soils(P<0.05).A.corsicum and A.murale removed much more Ni from Mojiang soil(total Ni 1062 mg/kg) than common vegetables,but mustard extracted most Ni from Xinyi soil(total Ni 107mg/kg).In Yuanjiang soil(total Ni 2519 mg/kg),removal of Ni was very low in all plants.Furthermore,adjustment of soil pH significantly influenced Ni uptake by A.corsicum and A.murale.Maximum Ni phytoextraction was achieved at around pH 6.0,lowering and raising pH significantly decreased the removal of Ni by A.corsicum and A.murale grown on serpentine soil.更多还原