9种植物对镉的忍耐和富集能力研究

土壤重金属污染已经成为中国日益严重的环境问题，为探讨利用植物修复重金属Cd污染土壤，以普通田园土为对照，研究浇施不同浓度Cd离子对9种植物成活与生长的影响，测定Cd离子在植物体的富集情况。结果表明：华北景天、木槿、羽衣甘蓝的地上部分镉含量大于10 mg/kg，为镉富集能力较强的植物，华北景天的镉离子转移系数达到3.06，显著优于其他测试植物，夹竹桃、紫穗槐、木槿的根系含镉量均大于50 mg/kg，也可用于污染土壤的Cd离子固定和清除。

Study on the Accumulation and Tolerance of 9 Plants to Heavy Metal Cd in Soil

Heavy metal pollution of soil has been increasingly serious environmental concerns. Phytoremediation technology is a kind of economy and environmental friendly treatment to remove heavy metals in soil with hyperaccumulation plants. To screen hyperaccumulator which can extract heavy metal cadmium from contaminated soils, a pot experiment was developed. The results showed that: the Cd contents of Sedum tatarinowii Maxim, Hibiscus syriacus L. and Brassica oleracea L. var. acephala DC. in above-ground parts were great than 10 mg/kg. The Cd-transfer ratio of Sedum tatarinowii Maxim was 3.06, the highest one among all tested materials. Cd in under-ground parts of Nerium indicum Mill., Amorpha fruticosa L. and Hibiscus syriacus L. could be great than 50 mg/kg. The results indicated that 5 plants mentioned above could be grow, and fix and eliminate Cd in Cd-polluted soils.