Biochar colloids facilitate magnesium migration and transformation in soil: Active site competition coupling with mineral magnesium release - Zhen Li; Yutao Peng; Jing Li; Yongzhou Hao; Yixuan Lian; Qingran Guo; Jingjing Chang; Lei Chen; Dasen Xie; Liangquan Wu; Yanshu Hao; Baige Zhang (Journal of Environmental Chemical Engineering, 2026)