不同土壤类型下杂交籼稻地上部器官对重金属镉和铅的富集特征

于2008年选用江苏省两种典型土壤(潮土和水稻土),采用盆栽试验研究杂交籼稻K优818地上部不同器官对土壤重金属镉(Cd)和铅(Pb)的富集特征。结果显示,水稻地上部不同器官对土壤Cd和Pb的富集特征差异显著,总体上呈现茎鞘叶片大米的趋势。水稻土栽培下重金属对水稻株高、单穗重等的抑制效应显著强于潮土,且抑制效应随土壤重金属浓度的升高而增强。与对照相比,当外源Cd和Pb的浓度为7mg/kg和900mg/kg时,单穗重降幅最大,分别下降了28.4%和36.6%。不同土壤类型下,重金属的生物有效性差异明显,水稻土栽培下水稻各器官的Cd与Pb含量显著高于潮土。

Accumulation Characteristics of Cadmium and Lead in Aboveground Organs of Indica Hybrid Rice as Affected by Different Soil Types

Pot experiments were conducted to investigate the accumulation characteristics of Cd and Pb in aboveground organs of indica hybrid rice(K you 818) in two typical soils (paddy soil and alluvial soil) in 2008.There were significant differences in the concentrations of Cd and Pb in different aboveground organs,following an order of stem and sheath>leaves>milled rice(P<0.05).The inhibitory effects of the two heavy metals on plant height and single panicle weight were significantly greater in the paddy soil than...