Biochar-based rhizosphere engineering for enhanced CH4 removal in landfill cover soil

作者：Rujie Zhang, Jianfei Ye, Jiahui Chen, Jiang Wu, Jie Wang, Xinyue Bai, Huaihai Chen, Qiyong Xu, Dandan Huang · 发表于：Journal of Environmental Management · 年份：2025 · DOI：10.1016/j.jenvman.2025.126348 · 被引用次数：4 · 研究领域：Landfill Environmental Impact Studies、Anaerobic Digestion and Biogas Production、Microbial metabolism and enzyme function

Rhizosphere engineering represents a promising strategy for augmenting methanotrophic activity in landfill cover soil (LCS). However, the mechanistic interplay between plant-biochar combinations and their collective influence on the rhizosphere-mediated regulation of methane (CH 4 ) biofiltration processes remains inadequately elucidated. This study systematically investigated the efficacy of vegetated LCS systems by integrating three herbaceous plant species with two distinct biochar types, evaluating CH 4 removal efficiency across three operational phases: Phase I (continuous CH 4 input), Phase II (fluctuating CH 4 input), and Phase III (resumed continuous CH 4 input). During Phase I, vegetation played a pivotal role in shaping rhizosphere microbial communities, with Solanum americanum -planted LCS demonstrating superior methanotrophic activity, attributable to its favorable metabolite profile. Swine manure-derived biochar (MBC) significantly enhanced CH 4 removal efficiency compared to maize straw-derived biochar (SBC). However, MBC-amended soils exhibited diminished resistance to CH 4 starvation during Phase II, a phenomenon correlated with reduced availability of root-derived metabolites. Instead, rhizosphere microbial communities with enhanced nutrient-importing capacities demonstrated greater retention of methanotrophic activity. The dominance of rhizosphere-mediated effects was disrupted by CH 4 input fluctuations in Phase II, underscoring the vulnerability of plant-d...