Biochar-loaded AM fungi coupled with Arundo donax enable targeted red mud remediation via valency—specific metal detoxification and soil function recovery. - Wang, Xiaohui; Sun, Yingqiang; Zeng, Danjuan; Fu, Chuanming; Wang, Keyi; Yang, Junbo; Liao, Jianxiong; Xian, Kanghua; Song, Fuqiang; Pu, Gaozhong (Biochar, 2026)