Lin Lijin, Ning Bo, Liao Ming'an, Ren Yajun, Wang Zhihui, Liu Yingjie, Cheng Ji, Luo Li
College of Horticulture, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China.
Environ Monit Assess. 2015 Jan;187(1):4205. doi: 10.1007/s10661-014-4205-8. Epub 2014 Dec 14.
The farmland weed Youngia erythrocarpa has been found to have the basic characteristics of a cadmium (Cd) hyperaccumulator. This study carried out preliminary and further Cd concentration gradient experiments and field experiment using Y. erythrocarpa to confirm this fact. The results showed that the biomass and resistance coefficient of Y. erythrocarpa decreased, but the root/shoot ratio and the Cd content in roots and shoots increased with the increase in soil Cd concentration. The Cd content in shoots of Y. erythrocarpa exceeded 100 mg/kg when the soil Cd concentration was 25 mg/kg in the two concentration gradient experiments, up to the maxima of 293.25 and 317.87 mg/kg at 100 mg/kg soil Cd. Both the bioconcentration factor of the shoots and the translocation factor exceeded 1 in all Cd treatments. In the field experiment, the total Cd extraction by shoots was 0.934-0.996 mg/m(2) at soil Cd levels of 2.04-2.89 mg/kg. Therefore, Y. erythrocarpa is a Cd hyperaccumulator that could be used to remediate Cd-contaminated farmland soil efficiently.
已发现农田杂草红果黄鹌菜具有镉（Cd）超积累植物的基本特征。本研究利用红果黄鹌菜进行了初步和进一步的镉浓度梯度实验以及田间试验，以证实这一事实。结果表明，随着土壤镉浓度的增加，红果黄鹌菜的生物量和抗性系数降低，但根冠比以及根和地上部分的镉含量增加。在两个浓度梯度实验中，当土壤镉浓度为25mg/kg时，红果黄鹌菜地上部分的镉含量超过100mg/kg，在土壤镉浓度为100mg/kg时分别高达293.25和317.87mg/kg的最大值。在所有镉处理中，地上部分的生物富集系数和转运系数均超过1。在田间试验中，土壤镉含量为2.04 - 2.89mg/kg时，地上部分提取的镉总量为0.934 - 0.996mg/m²。因此，红果黄鹌菜是一种镉超积累植物，可用于有效修复镉污染的农田土壤。
