Bi Xiangyang, Feng Xinbin, Yang Yuangen, Li Xiangdong, Shin Grace P Y, Li Feili, Qiu Guangle, Li Guanghui, Liu Taoze, Fu Zhiyou
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
Environ Pollut. 2009 Mar;157(3):834-9. doi: 10.1016/j.envpol.2008.11.013. Epub 2008 Dec 18.
Plants grown in contaminated areas may accumulate trace metals to a toxic level via their roots and/or leaves. In the present study, we investigated the distribution and sources of Pb and Cd in maize plants (Zea mays L.) grown in a typical zinc smelting impacted area of southwestern China. Results showed that the smelting activities caused significantly elevated concentrations of Pb and Cd in the surrounding soils and maize plants. Pb isotope data revealed that the foliar uptake of atmospheric Pb was the dominant pathway for Pb to the leaf and grain tissues of maize, while Pb in the stalk and root tissues was mainly derived from root uptake. The ratio of Pb to Cd concentrations in the plants indicated that Cd had a different behavior from Pb, with most Cd in the maize plants coming from the soil via root uptake.
生长在受污染地区的植物可能会通过根系和/或叶片将微量金属积累到有毒水平。在本研究中，我们调查了在中国西南部一个典型的锌冶炼影响区种植的玉米植株（Zea mays L.）中铅和镉的分布及来源。结果表明，冶炼活动导致周边土壤和玉米植株中铅和镉的浓度显著升高。铅同位素数据显示，大气铅的叶面吸收是铅进入玉米叶片和籽粒组织的主要途径，而茎和根组织中的铅主要来源于根系吸收。植株中铅与镉浓度的比值表明，镉与铅的行为不同，玉米植株中的大部分镉通过根系吸收来自土壤。
