马唐与玉米间作对镉的富集效果研究初探

采用盆栽土培试验，研究了马唐与玉米间作对玉米吸收和积累镉的影响。结果表明，无论是单作玉米还是间作玉米，同一镉浓度处理下，玉米各器官的舍镉量均为：根〉茎〉叶〉籽粒；同一器官不同镉浓度处理的镉含量大小顺序为：10mg〉5mg〉0mg。在没有镉胁迫情况下，单作马唐地上部积累的镉略高与间作马唐；当加入外源镉时，间作马唐积累的镉高于单作马唐，且达到显著水平。马唐对镉的积累量随着镉浓度的增加，马唐地上部积累镉的量也在相应增加。玉米与马唐间作系统，促进了玉米根部对镉的吸收，而籽粒中镉的含量反而有所降低。研究初步表明，玉米与马唐间作之后，能够相互促进对镉的吸收.

The Uptake and Accumulation Effect of Cd In the Maize-crabgrass Intercropping System

A soil pot-culture experiment was carried out to study maize (Zea mays L.) and crabgrass (Digitaria sanguinalis (L.)Scop.) Response to cadmium toxicity. The results showed that under the same level of Cd, con-tents sequence of Cd in the different organs of maize was root>stem>leaf>seed both intercropping and mono-cropping system. Contents sequence of Cd in the same organs of maize was 10mg>Smg>0mg under differ-ent levels of Cd. Compared with the control, crabgrass of intercropping accumulate more Cd than crabgrass of mono-cropping. Crabgrass accelerated the maize for uptake and accumulation of Cd and accumulates them in roots of the maize in intercropping system. The initial test showed that there was a mutual promotion of uptake and accumulation between maize and crabgrass in intercropping system.