不同浓度镉处理对金盏菊生长及镉积累特性的影响  

Effect of cadmium tolerance and accumulation in soil on Calendula officinalis

作　　者：胡云龙 张卫雄[2] 翟向华[2] 张琼[1] 鲁晋 刘金荣[1] HU Yunlong;ZHANG Weixiong;ZHAI Xianghua;ZHANG Qiong;LU Jin;LIU Jinrong(Key Laboratory of Grassland Farming Systems / College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020,Gansu,China;Third Institute Geological and Mineral Exploration of Gansu Provincial Bureau ofGeology and Mineral resources,Lanzhou 730000,Gansu,China)

机构地区：[1]草地农业生态系统国家重点实验室/兰州大学草地农业科技学院,甘肃兰州730020 [2]甘肃省地矿局第三地质矿产勘查院,甘肃兰州730000

出　　处：《草业科学》2019年第3期651-657,共7页Pratacultural Science

基　　金：甘肃省重大研发项目(17YF1NA065)

摘　　要：为探究金盏菊(Calendula officinalis)在镉污染土壤修复中的应用潜力,本研究通过盆栽试验,设定0(CK)、10、30、50、100 mg·kg^(-1) 5个Cd浓度梯度,分析金盏菊在不同浓度Cd胁迫下形态变化、耐性、Cd转移系数和积累特征。结果显示,金盏菊植株在不同浓度Cd胁迫下没有表现出明显的不良状况,株高及生物量随着Cd浓度的增加先增大后减小,在Cd浓度30 mg·kg^(-1)时达到最大值并显著高于CK (P <0.05),100 mg·kg^(-1)与CK无显著差异(P> 0.05);每个处理下金盏菊的转移系数均小于1,而地上部富集系数均大于1,金盏菊对重金属Cd的积累量随着土壤中Cd浓度的增加而增大,100 mg·kg^(-1)时每株正常生长的金盏菊对Cd的积累量达到908.21μg。研究结果表明,金盏菊对Cd胁迫具有较好耐性,Cd浓度较高时能起到良好的富集效果。因此,金盏菊在Cd污染浓度较高的土壤上有一定应用潜力。Heavy metal pollution is a global environmental problem that threatens ecosystems and human health. Cadmium (Cd) pollution is the most prominent heavy metal pollution due to its high toxicity, strong migration, and the large area it affects globally. A pot culture experiment with five concentrations of cadmium Cd (0, 10, 30, 50, and 100 mg·kg^-1 in dry soil) was conducted to investigate Cd accumulation and tolerance in the roots and shoots of Calendula officinalis and its potential for phytoremediation. The results indicated that the growth of Calendula officinalis was not significantly inhibited and there was no evidence of toxicity. The plant height and biomass of C. officinalis first increased and then decreased with increasing Cd concentrations. When the concentration of Cd was 30 mg·kg^-1, the plant height and biomass of C. officinalis reached its peak and was significantly higher than that of control, whereas there was no significant difference between 100 mg·kg^-1 and control. The transfer coefficients of C. officinalis were less than 1 under each treatment;the enrichment coefficients of plants under all treatments were greater than 1. The accumulation of heavy metal Cd by C. officinalis increased with increases in Cd concentrations in the soil. At 100 mg·kg^-1, the accumulation of Cd per normal growth of C. officinalis reached 908 μg·plant^-1. Considering its rapid growth, high biomass, and adaptive properties, C. officinalis could be a valuable tool for the phytoremediation of Cd contaminated soils, especially in highly Cd-contaminated soil, as it can have a good enrichment effect.

关 键 词：金盏菊 污染 镉胁迫 修复潜力 镉积累特征 耐性 

分 类 号：Q945.78[生物学—植物学] X173[环境科学与工程—环境科学]