The Enrichment and Transfer of Heavy Metals for Two Ferns in Pb-Zn Tailing Jiajie Mai, Qihe Yang, Yingfei Zhang, Xianlu Zeng, Yanmei Zhong and Deliang Liu MATEC Web Conf., 100 (2017) 04030 Published online: 08 March 2017 DOI: 10.1051/matecconf/201710004030