不同程度污染农田苎麻吸收积累镉特性研究

Cd Uptake and Accumulation of Ramie Planting in Contaminated Soil in Anhua and Zhuzhou of Hunan Province

以4个主要的苎麻栽培品种为材料,分别在安化和株洲镉污染农田研究这些品种的生长情况以及各器官镉含量。结果表明:安化和株洲试点苎麻平均产量分别为2 501 kg/(hm.2a)和2 148 kg/(hm.2a)。苎麻各品种皮中的镉含量显著高于骨和叶。2个试点平均地上部镉含量分别为21.05 mg/kg和7.75 mg/kg,品种间地上部镉含量存在显著差异,且地上部镉含量与土壤镉含量呈显著正相关,各品种富集系数>1。‘中苎1号’产量和地上部镉含量显著高于其他品种。在镉污染农田种植耐性强、高积累的苎麻品种能产生较好的经济效益和生态效益。

Four varieties of ramie（Boehmeria nivea（L.）Gaud） were planted in farmland of Anhua and Zhuzhou,which had been irrigated by Cd wastewater,yield and Cd concentrations in stem,bark and leaf of ramie were investigated.The results showed that yield of ramie that planted in Anhua and Zhuzhou was 2 501 kg/（hm2.a）,2 148 kg/（hm2.a）,respectively.Analyses of variance showed that Cd concentration in bark was significant higher than in stem and leaf.Concentration of Cd in ramie shoots of Anhua and Zhuzhou was 21.05 mg/kg,7.75 mg/kg,respectively,Cd concentration in shoots was obviously different in 4 varieties,and increased as the increasing Cd concentrations in the soil.Bioaccumulation factors of 4 ramie varieties were higher than 1.Zhongzhu No.1 had markedly higher aboveground biomass and Cd bioaccumulation than other ramie varieties.Therefore,the selection and breeding of varieties that had strong tolerance and accumulated higher levels of Cd are believed to bring great economical and environmental benefits.