摘要
为探究重金属Cd胁迫对6种水生植物生长及水质净化的影响,文章以金鱼藻(Ceratophyllum demersum)、美人蕉(Canna indica L.)、黄菖蒲(I.pseudacorus)、水芙蓉(Pistia stratiotes)、穗花狐尾藻(Myriophyllum spicatum Linn.)、凤眼莲(Eichhornia crassipes)等6种水生植物为研究对象,测定其对不同浓度Cd污染水体的净化能力及Cd胁迫条件下水生植物的生长特征。结果显示,Cd胁迫下6种水生植物的存活率为100%,Cd胁迫抑制了水生植物的生物量积累和营养元素含量,且低浓度条件下水生植物生物量的平均增长率为最高(24%);Cd主要积累于水生植物的根部,Cd胁迫下水生植物根茎叶Cd的胁迫浓度与植物体内磷元素和钾元素含量呈负相关,胁迫的分界点为1 mg/L。单一水生植物中凤眼莲(85.6%)、水芙蓉(82.7%)和美人蕉(78.8%)的净化率较好;组合水生植物中B4(金鱼藻+黄菖蒲+凤眼莲)和B6(穗花狐尾藻+美人蕉+凤眼莲)的净化效果最佳;结合水生植物在园林景观中的效果,可以将上述植物作为Cd污染修复的潜在物种,应用到人工湿地、生态浮床等设计中去。
To explore the effects of heavy metal Cd stress on the growth and purification of 6 aquatic plants,including Ceratophyllum demersum,Canna indica L.,I.pseudacorus,Pistia stratiotes,Myriophyllum spicatum Linn.and Eichhornia crassipes,the purification ability of different concentrations of Cd contaminated water bodies and the growth characteristics of aquatic plants under Cd stress conditions were determined.The results showed that the survival rate of 6 aquatic plants under Cd stress was 100%,Cd stress inhibited the biomass accumulation and nutrient content of aquatic plants,and the average growth rate of aquatic plant biomass was the highest(24%)under low concentration conditions.Cd is mainly accumulated in the roots of aquatic plants,and the stressed concentration of Cd in the roots and leaves of aquatic plants under Cd stress is negatively correlated with the content of phosphorus and potassium elements in plants,and the demarcation point of stress is1 mg/L.The purification rate of Eichhornia crassipes(85.6%),Pistia stratiotes(82.7%)and Canna indica L(78.8%)were better in single aquatic plants.The purification effects of B4(Ceratophyllum demersum and I.pseudacorus and Eichhornia crassipes)and B6(Myriophyllum spicatum Linn.,Canna indica L.and Eichhornia crassipes)in the combined aquatic plants are the best.Combined with the effect of plants in the landscape,above-mentioned plants can be applied to artificial wetlands,ecological floating beds and other designs as potential species of Cd pollution repairing.
作者
余婷
郑永红
张治国
陈永春
孙翔
陈小运
武琳
肖观红
韩李诗佳
YU Ting;ZHENG Yonghong;ZHANG Zhiguo;CHEN Yongchun;SUN Xiang;CHEN Xiaoyun;WU Lin;XIAO Guanhong;HAN Lishijia(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;National Engineering Technology Research Institute of Coal Mining,Huainan 232001,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第1期63-70,共8页
Environmental Science & Technology
基金
国家自然科学基金项目(51904014)
安徽省高校自然科学研究项目(KJ2018A0072)
“土壤卫士”创客实验室项目(2016ckjh071)
关键词
CD胁迫
水生植物
转移系数
富集系数
Cd stress
aquatic plants
transfer coefficient
enrichment coefficient
