Li Ning-Yu, Li Zhi-An, Ding Yong-Zhen, Zou Bi, Zhuang Ping
South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Ying Yong Sheng Tai Xue Bao. 2008 Jun;19(6):1369-73.
A greenhouse experiment was conducted to investigate the effects of intercropping 7 kinds of crops on the Cd uptake by maize (Zea mays L.). The results showed that most intercrops had no significant effects on the growth of maize, only with purple haricot reduced the maize biomass by 32.2% of the control. Legume crops enhanced the total quantity of Cd in maize in a great magnitude, and chickpea worked most efficiently, which doubled the Cd quantity in maize. The 7 intercrops showed different capability of Cd uptake, among which, rape and amaranth absorbed larger amount of Cd, with a Cd level of 53.9 mg x kg(-1) and 51.0 mg x kg(-1) in their aboveground parts, respectively, and of 91.8 mg x kg(-1) in amaranth root when the soil Cd content was 3 mg x kg(-1) soil. There was an interaction between maize and intercrops in Cd uptake. Legumes absorbed smaller amount of Cd but significantly increased the Cd uptake by maize, while amaranth was in adverse. Rape had a higher level of Cd concentration in its shoot, but reduced the Cd in aboveground part of maize. It was indicated that if maize was used for phytoremediation of Cd-contaminated soil, a higher efficiency of Cd removal could be achieved by intercropping it with legumes. Rape and amaranth could be the two promising plants for phytoremediation because of their high Cd accumulation.
进行了一项温室试验，以研究间作7种作物对玉米（Zea mays L.）吸收镉的影响。结果表明，大多数间作作物对玉米生长无显著影响，只有紫芸豆使玉米生物量比对照降低了32.2%。豆科作物极大地提高了玉米中镉的总量，其中鹰嘴豆效果最为显著，使玉米中的镉含量增加了一倍。这7种间作作物表现出不同的镉吸收能力，其中，当土壤镉含量为3 mg/kg时，油菜和苋菜地上部分的镉含量较高，分别为53.9 mg/kg和51.0 mg/kg，苋菜根部镉含量为91.8 mg/kg。玉米和间作作物在镉吸收方面存在相互作用。豆科作物吸收的镉较少，但显著增加了玉米对镉的吸收，而苋菜则相反。油菜地上部分镉浓度较高，但降低了玉米地上部分的镉含量。结果表明，如果利用玉米对镉污染土壤进行植物修复，与豆科作物间作可提高镉的去除效率。油菜和苋菜因其对镉的高积累量，可能是两种很有前景的植物修复植物。
