Microbial nutrient stimulation enhances in situ methanogenesis ~ 900 m depth in coalbeds: evidence from long-term field trial in Hancheng Block - Weidong Yan; Jiaming Yang; Zhidong Guo; Yingming Wang; Hui Wang; Wenhui Meng; Yang Yuan; Hailin Yang; Shoushuai Feng (Systems Microbiology and Biomanufacturing, 2026)